BrightSphere Investment 10-K 30 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Mar. 27, 2015	Jun. 30, 2014
Document and Entity Information
Entity Registrant Name	OM Asset Management plc
Entity Central Index Key	1611702
Document Type	10-K
Document Period End Date	31-Dec-14
Amendment Flag	FALSE
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Public Float			$0
Entity Common Stock, Shares Outstanding		120,000,000
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Assets
Cash and cash equivalents	$268.60	$282.20
Investments (includes balances reported at fair value of $94.2 and $95.2)	209.9	554.3
Investments at fair value	154.8	501.4
Goodwill	126.5	117.8
Deferred tax assets	330.3	294.2
Total assets	7,772.90	8,551.80
Liabilities and shareholders' equity
Long-term compensation liabilities	228.3	216.6
Total liabilities	5,215.50	6,015.90
Commitments and contingencies
Redeemable non-controlling interests in consolidated Funds	61.9	403.3
Equity:
Total equity and redeemable non-controlling interests in consolidated Funds	2,557.40	2,535.90
Total liabilities and equity	7,772.90	8,551.80
Consolidated Entity Excluding Consolidated Funds
Assets
Cash and cash equivalents	175.6	194.2
Investment advisory fees receivable	161.1	154.9
Property and equipment, net	24.1	24.1
Investments (includes balances reported at fair value of $94.2 and $95.2)	149.3	148.1
Investments at fair value	94.2	95.2
Acquired intangibles, net	1	1.2
Goodwill	126.5	117.8
Other assets	21.3	24.8
Note receivable due from related party		32.2
Deferred tax assets	330.3	294.2
Liabilities and shareholders' equity
Accounts payable and accrued expenses	39.5	43.9
Accrued incentive compensation	132.1	128.7
Interest payable to related parties		14.6
Other amounts due to related parties	289.9	1
Long-term compensation liabilities	228.3	216.6
Accrued income taxes	47	6.7
Notes payable to related parties	37	1,040.70
Third party borrowings	177	2.5
Other liabilities	5.9	6.4
Equity:
Ordinary shares (nominal value $0.001; issued and outstanding 120,000,000 shares)	0.1
Shareholders' equity	31.1
Parent equity (deficit)		-449.8
Accumulated other comprehensive income	5.3	3
Non-controlling interests	0	0.1
Consolidated Funds
Assets
Cash and cash equivalents	93	88
Restricted cash in Timber Funds	2,487.70	2,557
Investments at fair value	60.6	406.2
Timber assets	4,053.20	4,422.10
Other assets	89.2	87
Liabilities and shareholders' equity
Accounts payable and accrued expenses	66.9	33.5
Notes payable to related parties	318.7	604.7
Third party borrowings	3,777.20	3,783.10
Securities sold, not yet purchased, at fair value	16.4	24.6
Other liabilities	79.6	108.9
Redeemable non-controlling interests in consolidated Funds	61.9	403.3
Equity:
Non-controlling interests	$2,459	$2,579.30

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014
In Millions, except Share data, unless otherwise specified
Investments, fair value (in dollars)	$154.80
Consolidated Entity Excluding Consolidated Funds
Investments, fair value (in dollars)	$94.20
Ordinary shares, nominal value (in dollars per share)	$0.00
Ordinary shares, issued shares	120,000,000
Ordinary shares, outstanding shares	120,000,000

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue:
Revenue from timber	$425.70	$401.10	$257.10
Total revenue	1,056.30	928.6	703.5
Operating expenses:
Amortization of acquired intangibles	0.1	0.1	0.1
Total operating expenses	1,123.50	1,028.10	766
Operating loss	-67.2	-99.5	-62.5
Non-operating income and (expense):
Total non-operating income	35	15.7	15.8
Loss from continuing operations before taxes	-32.2	-83.8	-46.7
Income tax expense	12.8	13.3	3.3
Loss from continuing operations	-45	-97.1	-50
Gain (loss) from discontinued operations, net of tax	-1.1	2.7	-27
Gain (loss) on disposal of discontinued operations, net of tax	2.3	-2.1	10.8
Net loss	-43.8	-96.5	-66.2
Net income attributable to controlling interests	51.7	25.7	3
Earnings per share (basic) attributable to controlling interests (in dollars per share)	$0.43	$0.21	$0.03
Earnings per share (diluted) attributable to controlling interests (in dollars per share)	$0.43	$0.21	$0.03
Continuing operations earnings per share (basic) attributable to controlling interests (in dollars per share)	$0.46	$0.16	$0.20
Continuing operations earnings per share (diluted) attributable to controlling interests (in dollars per share)	$0.46	$0.16	$0.20
Weighted average ordinary shares outstanding	120,000,000	120,000,000	120,000,000
Weighted average diluted ordinary shares outstanding	120,000,000	120,000,000	120,000,000
Consolidated Entity Excluding Consolidated Funds
Revenue:
Management fees	569.7	478.2	399.3
Performance fees	34.3	18.1	14.1
Other revenue	1.6	1.8	0.5
Operating expenses:
Compensation and benefits	429.4	352.3	267.2
General and administrative expense	83.9	68.7	68.6
Amortization of acquired intangibles	0.1	0.1	0.1
Impairment of goodwill and acquired intangibles			1.7
Depreciation and amortization	6.1	4.9	5.8
Non-operating income and (expense):
Investment income	12.2	10.7	16.5
Interest income	0.2	0.5	1.4
Interest expense	-50.6	-72.2	-84.1
Net income attributable to non-controlling interests		0.1
Consolidated Funds
Revenue:
Other revenue	25	29.4	32.5
Operating expenses:
Interest and dividend expense	135.6	150.1	121.1
Timber expense	257.7	238.4	164.6
Depletion expense	128.4	142.9	83.7
Other expense	82.3	70.7	53.2
Non-operating income and (expense):
Interest expense	-135.5	-149.3	-127.2
Net consolidated Funds gains	73.2	76.7	82
Net income attributable to non-controlling interests	($95.50)	($122.30)	($69.20)

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net loss	($43.80)	($96.50)	($66.20)
Foreign currency translation adjustment	-2.5	-19.1	1.2
Total other comprehensive loss	-46.3	-115.6	-65
Total comprehensive income attributable to controlling interests	52.4	27	4.6
Consolidated Entity Excluding Consolidated Funds
Comprehensive income (loss) attributable to non-controlling interests, net of tax		0.1
Consolidated Funds
Comprehensive income (loss) attributable to non-controlling interests, net of tax	($98.70)	($142.70)	($69.60)

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Shareholders' Equity (USD $)	Consolidated Entity Excluding Consolidated Funds	Consolidated Entity Excluding Consolidated Funds	Consolidated Entity Excluding Consolidated Funds	Consolidated Entity Excluding Consolidated Funds	Consolidated Entity Excluding Consolidated Funds	Consolidated Entity Excluding Consolidated Funds	Consolidated Funds	Consolidated Funds	Total
In Millions, except Share data, unless otherwise specified	Total shareholders' equity (deficit)	Common stock	Shareholders' equity (deficit)	Accumulated other comprehensive income.	Non-controlling interests		Non-controlling interests
Balance at Dec. 31, 2011	($492.50)		($492.50)		$4.50		$3,055.20		$2,567.20
Balance at Dec. 31, 2011									2,676
Balance at Dec. 31, 2011								108.8
Increase (Decrease) in Stockholders' Equity
Capital contributions (redemptions)							613		613
Equity-based compensation	2.9		2.9		-3.6				-0.7
Foreign currency translation adjustment	1.6			1.6			-0.4		1.2
Parent company corporate cost allocation						-2.8
Parent company corporate cost allocation	2.8		2.8						2.8
Net consolidation (deconsolidation) of funds							226.5		226.5
Distributions							-535.8		-535.8
Net Loss	3		3				-81.1		-78.1
Increase (Decrease) in redeemable non-controlling interest in consolidated Funds
Capital contributions (redemptions)								-26.5
Redemptions								-5.3
Net income (loss)								11.9
Increase (Decrease) in total equity and redeemable non-controlling interest in consolidated Funds
Capital contributions (redemptions)									586.5
Equity-based compensation									-0.7
Foreign currency translation adjustment									1.2
Parent company corporate cost allocation									2.8
Redemptions									-5.3
Net consolidation (deconsolidation) of funds									-226.5
Distributions									-535.8
Net income (loss)									-66.2
Balance at Dec. 31, 2012	-482.2		-483.8	1.6	0.9		2,824.40		2,343.10
Balance at Dec. 31, 2012									2,432
Balance at Dec. 31, 2012								88.9
Increase (Decrease) in Stockholders' Equity
Capital contributions (redemptions)							-0.4		-0.4
Equity-based compensation	5		5		-0.9				4.1
Foreign currency translation adjustment	1.4			1.4			-20.5		-19.1
Parent company corporate cost allocation						-3.3
Parent company corporate cost allocation	3.3		3.3						3.3
Net consolidation (deconsolidation) of funds								109
Distributions							-99.3		-99.3
Net Loss	25.7		25.7		0.1		-124.9		-99.1
Increase (Decrease) in redeemable non-controlling interest in consolidated Funds
Capital contributions (redemptions)								268.1
Distributions								-65.3
Net income (loss)								2.6
Increase (Decrease) in total equity and redeemable non-controlling interest in consolidated Funds
Capital contributions (redemptions)									267.7
Equity-based compensation									4.1
Foreign currency translation adjustment									-19.1
Parent company corporate cost allocation									3.3
Net consolidation (deconsolidation) of funds									109
Distributions									-164.6
Net income (loss)									-96.5
Balance at Dec. 31, 2013	-446.8		-449.8	3	0.1		2,579.30		2,132.60
Balance at Dec. 31, 2013									2,535.90
Balance at Dec. 31, 2013								403.3
Increase (Decrease) in Stockholders' Equity
Transfer of subsidiary to Parent	-14.4		-16	1.6				-327.4	-14.4
Tax on gain from transfer of subsidiary to Parent	-3.2		-3.2						-3.2
Issuance of ordinary shares	0.1	0.1							0.1
Issuance of ordinary shares (in shares)		120,000,000
Capital contributions (redemptions)	973.1		973.1				-72.1		901
Equity-based compensation	8.9		8.9						8.9
Deferred tax asset revaluation	4.3		4.3						4.3
Transfer of value incentive plan share award	1.8		1.8						1.8
Foreign currency translation adjustment	0.7			0.7			-3.2		-2.5
Parent company corporate cost allocation						-3.4
Parent company corporate cost allocation	3.4		3.4						3.4
Assignment of deferred tax assets and coinvestments	-304.3		-304.3						-304.3
IPO costs charged to parent	-23.1		-23.1						-23.1
Repurchase of Affiliate equity	-3.7		-3.7		-0.1				-3.8
Net consolidation (deconsolidation) of funds							60.2		60.2
Dividends to Parent	-212		-212						-212
Net Loss	51.7		51.7				-105.2		-53.5
Increase (Decrease) in redeemable non-controlling interest in consolidated Funds
Capital contributions (redemptions)								5.1
Net consolidation (deconsolidation) of funds								-28.8
Net income (loss)								9.7
Increase (Decrease) in total equity and redeemable non-controlling interest in consolidated Funds
Transfer of subsidiary to Parent									-341.8
Tax on gain from transfer of subsidiary to Parent									-3.2
Issuance of ordinary shares									0.1
Capital contributions (redemptions)									906.1
Equity-based compensation									8.9
Transfer of value incentive plan share award									1.8
Foreign currency translation adjustment									-2.5
Parent company corporate cost allocation									3.4
Assignment of deferred tax assets and coinvestments									-304.3
IPO costs charged to Parent									-23.1
Repurchase of Affiliate equity									-3.8
Net consolidation (deconsolidation) of funds									31.4
Dividends									-212
Net income (loss)									-43.8
Balance at Dec. 31, 2014	36.5	0.1	31.1	5.3			2,459		2,495.50
Balance (in shares) at Dec. 31, 2014		120,000,000
Balance at Dec. 31, 2014									2,557.40
Balance at Dec. 31, 2014								$61.90

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flow from operating activities:
Net loss	($43.80)	($96.50)	($66.20)
Adjustments to reconcile net profit (loss) to net cash provided by (used in) operating activities from continuing operations:
Deferred income taxes	-35.2	8.3	10.7
Changes in operating assets and liabilities (excluding discontinued operations):
Net cash flows from operating activities of continuing operations	179	130.8	38.8
Net cash flows from operating activities of discontinued operations	-24.9	13.7	-32.4
Total net cash flows from operating activities	154.1	144.5	6.4
Cash flow from investing activities:
Net cash flows from investing activities of continuing operations	-6	83.2	-576.8
Net cash flows from investing activities of discontinued operations	-7.1	-181	30.5
Total net cash flows from investing activities	-13.1	-97.8	-546.3
Cash flow from financing activities:
Net cash flows from financing activities of continuing operations	-151.3	-205.6	507.4
Net cash flows from financing activities of discontinued operations	-1.2	174.1	22.9
Total net cash flows from financing activities	-152.5	-31.5	530.3
Effect of foreign exchange rate changes on cash and cash equivalents	-2.1	-1.6	1
Net increase (decrease) in cash and cash equivalents	-13.6	13.6	-8.6
Cash and cash equivalents at beginning of period	282.2	268.6	277.2
Cash and cash equivalents at end of period	268.6	282.2	268.6
Supplemental disclosure of cash flow information:
Income taxes paid	6.1	5.5	0.8
Non-cash capital contribution to Parent	-14.4
Non-cash contribution from Parent	258.6
Consolidated Entity Excluding Consolidated Funds
Cash flow from operating activities:
Less: Net loss attributable to non-controlling interests		0.1
Adjustments to reconcile net profit (loss) to net cash provided by (used in) operating activities from continuing operations:
Net (income) loss from discontinued operations	3.5	-6.3	21
Amortization and impairment of acquired intangibles	0.1	0.1	1.8
Depreciation and other amortization	6.1	4.9	5.8
Loss on disposal of property and equipment	0.4
Amortization and revaluation of non-cash compensation awards	103.9	61.6	27.2
Parent company corporate cost allocation	3.4	3.3	2.8
Net earnings from affiliates accounted for using the equity method	-9.6	-7.7	-14.8
Distributions received from equity method affiliates	7.7	15.3	10.1
Deferred income taxes	-35.3	10.3	9.1
(Gains) losses on other investments	-2.6	-3	-1.8
Changes in operating assets and liabilities (excluding discontinued operations):
(Increase) decrease in investment advisory fees receivable	-26.9	-22.9	-27.6
(Increase) decrease in other receivables, prepayments, deposits and other assets	-28.5	-3.6	0.8
Increase (decrease) in accrued incentive compensation and other liabilities	-51.7	25.8	6.1
Increase (decrease) in accounts payable and accruals and accrued income taxes	34.7	9.7	4.8
Net cash flows from operating activities of continuing operations	56.9	113.3	48.2
Cash flow from investing activities:
Purchase of fixed assets, excluding discontinued operations	-7.6	-9.9	-12.7
Contingent payments for affiliate equity	-11
Dispositions of Affiliates	-3.8
Purchase of investment securities	-8.8	-15.2	-66.9
Sale of investment securities	25.5	15.1	55.6
Cash flow from financing activities:
Proceeds from third party borrowings	174.5
Proceeds from related party borrowings			30
Repayment of third party borrowings		-13.5	-0.5
Repayment of related party borrowings	-37	-90.8	-80.3
Payment to parent for deferred tax arrangement	-12.3
Dividends paid to related parties	-175
Cash and cash equivalents at beginning of period	194.2
Cash and cash equivalents at end of period	175.6	194.2
Supplemental disclosure of cash flow information:
Interest paid (excluding consolidated Funds)	64.4	72.5	83.9
Consolidated Funds
Cash flow from operating activities:
Less: Net loss attributable to non-controlling interests	-95.5	-122.3	-69.2
Adjustments to reconcile net profit (loss) to net cash provided by (used in) operating activities from continuing operations:
Net (income) loss from discontinued operations	4.7		-4.9
Depletion	128.4	142.9	83.7
(Gains) losses on other investments	-4.6	-27.7	-33.5
Changes in operating assets and liabilities (excluding discontinued operations):
(Increase) decrease in receivables other assets	24.5	-52.3	1.3
Increase (decrease) in accounts payable and other liabilities	64.6	76.9	13.2
Net cash flows from operating activities of continuing operations	122.1	17.5	-9.4
Cash flow from investing activities:
Purchase of investment securities	-105.1	-191.7	-934.1
Sale of investment securities	87.5	333.3	364.9
Change in restricted cash	31.5	-48	75.2
Deconsolidation of funds	-14.2	-0.4	-58.8
Cash flow from financing activities:
Proceeds from third party borrowings	4.1		137.3
Repayment of debt	-4.7	-30.3	-72.1
Non-controlling interest capital raised		29	587
Non-controlling interest capital redeemed	-25.1	-91.2	-77.9
Redeemable non-controlling interest capital raised	10.7
Redeemable non-controlling interest capital redeemed	-6.9	-8.8	-16.1
Distributions to non-controlling interests	-77.7
Distributions to redeemable non-controlling interests	-1.9
Cash and cash equivalents at beginning of period	88
Cash and cash equivalents at end of period	$93	$88

Organization_and_Description_o

Organization and Description of the Business	12 Months Ended
	Dec. 31, 2014
Organization and Description of the Business
Organization and Description of the Business	1) Organization and Description of the Business
	OM Asset Management plc ("OMAM" or the "Company"), through its subsidiaries, is a global asset management business with interests in a diverse group of boutique investment management firms (the "Affiliates") individually headquartered in the United States. The Company provides investment management services globally to predominantly institutional investors, in asset classes that include U.S. and global equities, fixed income, real estate and timber. Fees for services are largely asset-based and, as a result, the Company's revenue fluctuates based on the performance of financial markets and investors' asset flows in and out of the Company's products.
	The Company's Affiliates are organized as limited liability companies. The Company generally utilizes a profit-sharing model in structuring its compensation and ownership arrangements with Affiliates. The Affiliates' variable compensation is generally based on each firm's profitability. OMAM and Affiliate key employees share in profits after variable compensation according to their respective ownership interests. The profit-sharing model results in the alignment of OMAM and Affiliate key employee economic interests, which is critical to the Company's talent management strategy and long-term growth of the business. The Company operates in one reportable segment.
	The Company is a majority-owned subsidiary of Old Mutual plc (the "Parent"), an international long-term savings, protection and investment group, listed on the London Stock Exchange.
	Reorganization
	At January 1, 2014, the Company's U.S. holding company, Old Mutual (US) Holdings Inc. ("OMUSH") was a subsidiary of OM Group (UK) Limited ("OMGUK") which was and is in turn wholly owned by the Parent. The board of directors of the Parent elected to undertake an initial public offering of the Company's ordinary shares (the "Offering") as outlined below.
	The Company and the Parent determined that certain transactions (the "Reorganization") should be undertaken in preparation for the Offering. Specifically, the pre-Offering restructuring steps described below were completed by the Company and the Parent on or before October 15, 2014:
	1	OMGUK incorporated OMAM in the United Kingdom as a direct, wholly-owned subsidiary of OMGUK.
	2	OMAM incorporated OMAM US, Inc. in the State of Delaware ("U.S. Sub") as a direct, wholly-owned subsidiary of OMAM.
	3	U.S. Sub incorporated OMAM UK Limited in the United Kingdom ("U.K. Sub") as a direct, wholly-owned subsidiary of U.S. Sub.
	4	The Company's existing intercompany debt, which was owed by OMUSH to OMGUK, was refinanced with new intercompany debt.
	5	OMGUK contributed its shares in OMUSH and the new intercompany debt to OMAM in return for an issuance of shares by OMAM resulting in the elimination of existing intercompany debt of $1,003.5 million and the redemption of a $32.2 million intercompany receivable via a capital distribution back to OMGUK, for a net reduction of existing intercompany debt of $971.3 million.
	6	The OMUSH shares were transferred to U.K. Sub via a series of share exchanges, and the new intercompany debt was contributed among OMAM, U.S. Sub and U.K. Sub.
	7	OMAM underwent a reduction of share capital to maximize distributable reserves, re-registered in the United Kingdom as a public limited company, amended its articles of association to reflect the same and organized its share capital for purposes of the Offering.
	8	OMAM declared a $175.0 million pre-Offering dividend to OMGUK. OMAM also issued a non-interest bearing promissory note to OMGUK in the principal amount of $37.0 million which will be paid as funds become available from Affiliate distributions, subject to the maintenance of a minimum level of cash holdings.
	9	OMAM entered into arrangements with OMGUK for the payment of future realizable benefits (estimated to total $252.2 million at December 31, 2014) associated with certain deferred tax assets existing as of the date of the Offering, as well as co-investments (with a carrying value of $35.0 million and a fair value of $43.5 million at December 31, 2014) made by the Company in real-estate and timber strategies of its Affiliates. In accordance with the deferred tax asset arrangement, in December 2014, OMAM began to make quarterly payments to OMGUK. In the fourth quarter of 2014, OMAM adjusted the balance of the liability to reflect the impact of the 2013 income tax return and also reduced the liability as of the Offering date to reflect a revised estimate of the future realizable benefits as of the Offering date. The liability will again be adjusted in the fourth quarter of 2015 to reflect the impact of the 2014 income tax return through October 8, 2014.
	10	The Company made a payment of the $175.0 million pre-Offering dividend to OMGUK, funded by a new third party credit facility entered into at the closing of the Offering; and
	11	OMAM completed the purchase of additional ownership of an Affiliate for $60.0 million in cash, resulting in a reduction of liabilities for the same amount.
	Additionally, the Company has recast the components of Shareholders' equity (deficit) to reflect the issuance of 120,000,000 ordinary shares, nominal value $0.001 per share.

Basis_of_Presentation_and_Sign

Basis of Presentation and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Basis of Presentation and Significant Accounting Policies
Basis of Presentation and Significant Accounting Policies
	2) Basis of Presentation and Significant Accounting Policies
	The Company's significant accounting policies are as follows:
	Basis of presentation
	These Consolidated Financial Statements reflect the historical balance sheets; statements of operations and of comprehensive income; statements of changes in shareholders' equity; and statements of cash flows of the Company. On October 15, 2014, the Company completed the Offering by its Parent of 22,000,000 ordinary shares of the Company pursuant to the Securities Act of 1933, as amended. Additionally, the underwriters in the Offering exercised a portion of their overallotment option and purchased an additional 2,231,375 shares of the Company from the Parent. Within these Consolidated Financial Statements, entities that are part of the Parent's consolidated results, but are not part of OMAM, as defined above, are referred to as "related parties." These historical Consolidated Financial Statements prepared prior to the Offering use the Parent's historical basis in determining the assets and liabilities and the results of the Company. The financial information included herein may not reflect the consolidated financial position, operating results, changes in the Parent's equity investment and cash flows of the Company in the future, and does not reflect what they would have been had the Company been a separate, stand-alone entity for the entirety of the periods presented.
	The Company historically has utilized the services of the Parent for certain functions. These services include providing working capital, as well as certain finance, internal audit, insurance, human resources, investor relations, risk, governance and other corporate functions and projects. The cost of these services has been allocated to the Company and included in the Consolidated Financial Statements. The allocations have been determined on the basis which the Parent and the Company considered to be reasonable reflections of the utilization of services provided by the Parent. Subsequent to the Offering, the Company assumed responsibility for the costs of these functions.
	The Consolidated Financial Statements are prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP"). All dollar amounts, except per share data in the text and tables herein, are stated in millions unless otherwise indicated. Transactions between the Company and the Parent are included in the Consolidated Financial Statements, however material intercompany balances and transactions among the Company, its consolidated Affiliates and consolidated Funds are eliminated in consolidation.
	Allocated Costs from the Parent
	The Company's Parent provides the Company with various services, including governance through the board of directors and executive committees, investor relations, procurement of insurance coverage, human resources, financial reporting, internal audit, treasury, systems, risk and tax services. Some of these services are directly attributable to the Company and some are of a more general nature. The costs associated with the services which are (i) directly attributable to the Company, (ii) have been charged directly to the Company by the Company's Parent, and (iii) have been paid to the Company's Parent by the Company have been reflected in the Company's Consolidated Financial Statements. During the years ended December 31, 2014, 2013 and 2012, the amount of expenses charged directly to the Company from the Company's Parent were $2.1 million, $2.0 million and $2.7 million, respectively.
	With respect to the above services and benefits which are not directly attributable to the Company, costs were allocated to the Company and included in the Consolidated Financial Statements, based generally on the Company's proportion of the total Parent's consolidated, normalized revenues. During the years ended December 31, 2014, 2013 and 2012, costs allocated to the Company from Parent were $3.4 million, $3.3 million and $2.8 million, respectively. Subsequent to the Offering, these general costs are no longer allocated and if required are borne directly by the Company.
	These cost allocations were determined using a method that Parent and the Company considered reasonably reflected the costs of such services attributable to the Company provided by Parent. The Company believes the assumptions and allocations underlying the Consolidated Financial Statements are reasonable and the allocated amounts are representative of the amounts that would have been recorded in the Consolidated Financial Statements had the Company operated independent of Parent for the historical periods presented prior to the Offering. A more detailed discussion of the relationship with Parent, including a description of the costs that have been allocated to the Company, as well as the allocation methods, is included in Note 10, "Related Party Transactions".
	Consolidation
	Affiliates
	The Company evaluates each of its Affiliate and other operating entities to determine the appropriate method of accounting. Generally, majority-owned entities or otherwise controlled investments in which the Company holds a controlling financial interest as the principal shareholder, managing member, or general partner are consolidated.
	Funds
	In the normal course of business, the Company's Affiliates sponsor and manage certain investment vehicles (the "Funds"). The Company assesses consolidation requirements with respect to its Funds pursuant to Accounting Standards Codification ("ASC") Topic 810 relating to the consolidation of variable interest entities. Substantially all of the Funds that are managed by the Company qualify for the deferral granted under Accounting Standards Updates ("ASU") 2010-10, "Amendments for Certain Investment Funds" ("ASU 2010-10"). As such, the Company evaluates these Funds for consolidation pursuant to guidance formerly in Financial Accounting Standards Board ("FASB") Interpretation No. 46(R), Consolidation of Variable Interest Entities. These Funds are typically owned entirely by third-party investors, however certain Funds are capitalized with seed capital investments from the Company or its related parties and may be owned partially by Affiliate key employees and/or individuals that own minority interests in an Affiliate.
	In evaluating whether or not a legal entity must be consolidated, the Company determines if such entity is a variable interest entity ("VIE") or a voting interest entity ("VOE"). A VOE is considered an entity in which (i) the total equity investment at risk is sufficient to enable the entity to finance its activities independently and (ii) the equity holders at risk have the obligation to absorb losses, the right to receive residual returns, and the right to direct the activities of the entity that most significantly impact the entity's economic performance. A VIE is an entity that lacks one or more of the characteristics of a VOE. Assessing whether an entity is a VIE or VOE involves judgment and analysis. Factors considered in this assessment include the entity's legal organization, the entity's capital structure and equity ownership and any related party or de facto agent implications of the Company's involvement with the entity. Investments that are determined to be VIEs are consolidated if the Company or a consolidated Affiliate is the primary beneficiary of the investment. VOEs are typically consolidated if the Company holds the majority voting interest or otherwise controls the entity.
	In evaluating whether the Company is the primary beneficiary, the Company evaluates its economic interests in the entity held either directly by the Company or indirectly through related parties. For VIEs that are investment companies subject to ASU 2010-10, the primary beneficiary of the VIE is generally the variable interest holder that absorbs a majority of the expected losses of the VIE, receives a majority of the expected residual returns of the VIE, or both. The Company generally is not the primary beneficiary of Fund VIEs created to manage assets for clients unless the Company's ownership interest, including interests of related parties, is substantial.
	For VIEs that do not qualify for the deferral granted under ASU 2010-10, the primary beneficiary of a VIE is defined as the variable interest holder that has a controlling financial interest. A controlling financial interest is defined as (i) the power to direct the activities of the VIE that most significantly impacts its economic performance and (ii) the obligation to absorb losses of the entity or the right to receive benefits from the entity that could potentially be significant to the VIE. If no single party satisfies both criteria, but the Company and its related parties satisfy the criteria on a combined basis, then the primary beneficiary is the entity out of the related party group that is most closely associated to the VIE. The consolidation analysis can generally be performed qualitatively, however, if it is not readily apparent that the Company is not the primary beneficiary, a quantitative analysis may also be performed.
	The Company consolidates VOEs when it has control over significant operating, financial and investing decisions of the entity. For VOEs organized as limited partnerships or as an entity with governance structures similar to a limited partnership (e.g., limited liability company with a managing member), the Company consolidates an entity when it holds the controlling general partnership interest and the limited partners do not hold substantive participating rights or rights to remove and replace the general partner or rights that could provide the limited partners with the ability to impact the ongoing governance and operating activities of the entity.
	Other than Funds holding investments in timber assets (the "Timber Funds"), the Company's consolidated Funds are investment companies (the "Investment Funds") and the Company has therefore retained their specialized investment company accounting in consolidation, pursuant to ASC 946, "Financial Services—Investment Companies."
	Upon the occurrence of certain events (such as contributions and redemptions, either by the Company, its Affiliates, or third parties, or amendments to the governing documents of the Company's investees or sponsored Funds) management reviews and reconsiders its previous conclusion regarding the status of an entity as a VIE or a VOE. Additionally, management continually reconsiders whether the Company is deemed to be a VIE's primary beneficiary who consolidates such entity.
	Timber Funds
	Timber assets and timber lease rights of consolidated Timber Funds are stated at historical cost less depletion for timber previously harvested and less accumulated amortization and depreciation for lease rights and roads. The Company performs a valuation of acquired timber property to assess the allocation of purchase price for each material asset acquired that is expected to provide a future economic benefit to the Company. Fair value of each asset is determined by using a discounted future cash flow model and applying assumptions commonly used in the industry. The cost of the acquired assets is then allocated pro rata based on the relative fair values. Timber investment values are adjusted for capital additions made to the property subsequent to the valuation date. All initial silviculture costs, including site preparation and planting costs are capitalized as stand establishment costs. Stand establishment costs are transferred to a merchantable timber classification as trees reach a certain size. Generally, costs incurred subsequent to two years after planting, such as fertilization, vegetation, insect control and pre-commercial thinning are considered to be maintenance and are expensed as incurred.
	The Company estimates its timber inventory using statistical information and data obtained from physical measurements, site maps, photo-types and other information gathering techniques. These estimates are updated annually and may result in adjustments of timber volumes, including timber growth rates and depletion rates.
	Depletion consists of costs attributed to harvesting timber and is recorded as an expense as timber is harvested. The depletion rate applied to the volume of timber sold is adjusted annually and is based on the relationship of incurred costs in the merchantable timber classification to estimated current merchantable volume.
	Timber and timberlands are reviewed for impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable. The Company compares the carrying value of a timber asset with the asset's expected future undiscounted cash flows. If the carrying value of the asset exceeds the expected future cash flows, impairment exists, which is measured by the excess of the carrying value over the fair value of the assets. The Company recognized no timber impairment losses for the years ended December 31, 2014, 2013 and 2012.
	Use of estimates
	The preparation of these Consolidated Financial Statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the period. Actual results could differ significantly from those estimates.
	Operating segment
	The Company operates in one operating segment that provides investment management services and products primarily to institutional clients. Although the Company does make certain disclosures regarding assets under management by product and affiliate, the Company's determination that it operates one business segment is based on the fact that the Chief Operating Decision Maker ("CODM") reviews the Company's financial performance on an aggregate level.
	Cash and cash equivalents
	The Company considers all highly liquid investments, including money market mutual funds, with original maturities of three months or less to be cash equivalents. Cash equivalents are stated at cost, which approximates market value due to the short-term maturity of these investments. Cash held by consolidated Funds is not available to fund general liquidity needs of the Company.
	Restricted cash in Timber Funds consists primarily of deposits in time deposit accounts, earning interest at LIBOR + a margin, which are restricted to payment of certain notes payable of consolidated Funds of the Company (also see Note 13). Restricted cash of the consolidated Timber Funds may only be drawn upon to meet debt service payments (corrective coverage payments) or to pay certain Fund operating expenses through December 31, 2014. During the period thereafter, the restricted reserve balance may only be drawn upon for principal payments.
	Fair value measurements
	In accordance with the provisions of FASB ASC 820, "Fair Value Measurement" ("ASC 820"), fair value is the price that the Company expects to be paid upon the sale of an asset or expects to pay upon the transfer of a liability in an orderly transaction between market participants. Pursuant to ASC 820, there is a three-level hierarchy for fair value measurements based upon the transparency of inputs to the valuation of an asset or liability. Inputs may be observable or unobservable and refer broadly to the assumptions that market participants would use in pricing the asset or liability. Observable inputs reflect the assumptions market participants would use in pricing the asset or liability based on market data obtained from independent sources. Unobservable inputs reflect the Company's own conclusions about the assumptions that market participants would use in pricing the asset or liability based on the best information available in the circumstances. Each investment is assigned a level based upon the observability of the inputs which are significant to the overall valuation. Assets and liabilities measured and reported at fair value are classified and disclosed in one of the following categories:
	•	Level I—Quoted prices are available in active markets for identical investments as of the reporting date. The type of investments included in Level I include listed equities and listed derivatives. As required by U.S. GAAP, the Company does not adjust the quoted price for these investments.
	•	Level II—Pricing inputs are other than quoted prices in active markets, which are either directly or indirectly observable as of the reporting date, and fair value is determined through the use of models or other valuation methodologies utilizing observable market inputs other than quoted prices. Investments which are generally included in this category include corporate bonds and loans, less liquid and restricted equity securities and certain over-the-counter derivatives.
	•	Level III—Pricing inputs are unobservable for the asset or liability and include assets and liabilities where there is little, if any, market activity for the investment. The inputs into the determination of fair value require significant management judgment or estimation. Investments that are included in this category generally include general and limited partner interests in corporate private equity, real estate funds, and funds of hedge funds.
	In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, an investment's level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The Company's assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the investment.
	Investments and Investment Transactions
	Valuation of investments held at fair value
	Valuation of Fund investments is evaluated pursuant to the fair value methodology discussed above. The Company's discretionary investments are categorized as trading and held at estimated fair value. Realized and unrealized gains and losses arising from changes in fair value of discretionary investments are reported within investment income in the Consolidated Statements of Operations. See Note 4 for a summary of the fair value inputs utilized to determine the fair value of other discretionary investments held at fair value.
	Security transactions
	The Investment Funds generally record securities transactions on a trade-date basis. Realized gains and losses on securities transactions are generally determined on the average-cost method (net of foreign capital gain taxes) and for certain transactions determined based on the specific identification method.
	Income and expense recognition
	The Investment Funds record interest income on an accrual basis and include amortization of premiums and accretion of discounts. Dividend income and expense on dividends sold short are recorded on the ex-dividend date, net of applicable withholding taxes. Expenses are recorded on an accrual basis.
	Foreign currency translation
	The books and records of the Company and its Affiliates are maintained in U.S. dollars. Except for one Timber Fund in Australia, the books and records of consolidated Funds are maintained in U.S. dollars. Investment securities and other assets and liabilities denominated in a foreign currency are translated into U.S. dollars on the date of valuation. Income and expense transactions denominated in foreign currencies are translated into U.S. dollars using the average exchange rate over the period presented. The portion of realized or unrealized gains and losses resulting from changes in foreign exchange rates and from fluctuations arising from changes in the market prices of the underlying securities are included in the net realized and unrealized gain and loss on investments on the consolidated statement of operations. Net realized and unrealized gains and losses on foreign currency transactions represent net foreign exchange gains or losses from forward foreign currency exchange contracts, disposition of foreign currencies, currency gains or losses between the trade and settlement date on security transactions, and the difference between the amount of the investment income and foreign withholding taxes recorded on the Funds' books and the U.S. dollar equivalent amounts actually received or paid.
	Short sales
	Certain of the Funds may sell a security they do not own in anticipation of a decline in the fair value of that security. When a Fund sells a security short, it must borrow the security sold short and deliver it to the broker-dealer through which it made the short sale. The short sales are secured by the long portfolio and available cash. The Fund records a gain, limited to the price at which the Fund sold the security short, or a loss, unlimited in size, upon the termination of a short sale. The amount of the gain or loss will be equal to the proceeds received in entering into the short sale less the cost of buying back the short security to close the short position. While the transaction is open, the Fund will incur an expense for any accrued dividends or interest which is paid to the lender of the securities. These short sales may involve a level of risk in excess of the liability recognized in the accompanying consolidated balance sheet. The extent of such risk cannot be quantified.
	Derivatives
	Certain Funds use derivative instruments. However, there is minimal risk to the Company in relation to the derivative assets and liabilities of the Funds in excess of its investment in the respective Funds holding the investment. The Funds' derivative instruments include foreign currency exchange contracts, credit default swaps, interest rate swaps, financial futures contracts and warrants. The fair values of derivative instruments are recorded as other assets or other liabilities on the Company's Consolidated Balance Sheets. The Company has used foreign exchange forwards to hedge the risk of movement in exchange rates on financial assets on a limited basis.
	The Company's Funds have not designated any financial instruments for hedge accounting, as defined in the accounting literature, during the periods presented. The gains or losses on derivative instruments not designated for hedge accounting are included as investment income in the Company's Consolidated Statements of Operations.
	Equity method investments
	The Company uses the equity method of accounting for investments that provide the Company with the ability to exercise significant influence over an entity, but that do not meet the requirements for consolidation. Equity method investments include two Affiliates, Heitman LLC and Investment Counselors of Maryland, LLC as well as all unconsolidated Funds over which the Company exercises significant influence. The Company's share of earnings (losses) from equity method investments is included in investment income in the Consolidated Statements of Operations. The carrying amounts of equity method investments are reflected in Investments in the Consolidated Balance Sheets. The Company evaluates its equity method investments for impairment whenever events or changes in circumstances indicate that the carrying amounts of such investments may not be recoverable. The difference between the carrying value and its estimated fair value is recognized as impairment when the loss is deemed other than temporary. Other investments, in which OMAM or an Affiliate do not exercise significant influence are accounted for under the cost method. Under the cost method, income is recognized as dividends are declared.
	Revenue recognition
	The Company's consolidated revenue primarily represents management fees billed monthly, quarterly and annually by Affiliates for managing the assets of clients. Asset-based management fees are recognized monthly as services are rendered and are primarily based upon a percentage of the market value of client assets managed. Affiliates that manage tangible property may also earn transaction fees at the time the underlying property is bought and sold. Any fees collected in advance are deferred and recognized as income over the period earned. Dividend income received by Investment Funds is recorded on the ex-dividend date. Performance fees are generally assessed as a percentage of the investment performance realized on a client's account. Performance fees, including those that are subject to clawback are recognized when they (i) become billable to customers (based on contractual terms of agreements), (ii) are not subject to contingent repayment and (iii) when collection is reasonably assured. Other income and revenues include interest income on cash and cash equivalents of Investment Funds and the Company's share of earnings from joint venture partners.
	Timber Funds' revenue is recognized from log and fiber sales upon delivery to the customer. The Company is typically responsible for all logging and hauling costs. However, under pay-as-cut timber contracts, title and risk of loss from stumpage sales transfer to the buyer as the trees are cut. Revenue is recognized as timber is harvested. The buyer is typically responsible for all logging and hauling costs.
	Investment advisory fees receivable
	The Company earns management and performance fees which are billed monthly, quarterly and annually in arrears, according to the terms of the relevant investment management agreement. Management and performance fees that have been earned, but have not yet been collected are presented as Investment advisory fees receivable on the Consolidated Balance Sheets. Due to the short-term nature and liquidity of these receivables, the carrying amounts approximate their fair values. The Company's accounts receivable balances do not include any allowance for doubtful accounts, nor has any bad debt expense attributable to accounts receivable been recorded for the years ended December 31, 2014, 2013, and 2012. The Company believes all accounts receivable balances are fully collectible.
	Property and equipment
	Property and equipment are recorded at historical cost and depreciated using the straight-line method over its estimated useful lives. The estimated useful lives of office equipment and furniture and fixtures range from three to five years. Leasehold improvements are amortized over the shorter of their estimated useful lives or the remaining term of the lease. Computer software developed or obtained for internal use is amortized using the straight-line method over the estimated useful life of the software, which is generally three years or less. The costs of improvements that extend the life of a fixed asset are capitalized, while the cost of repairs and maintenance is expensed as incurred.
	Intangible assets
Acquired Affiliates have identifiable intangible assets arising from contractual or other legal rights with their clients. In determining the value of acquired intangibles, the Company analyzes the net present value of each acquired Affiliate's existing client relationships based on a number of factors. The Company analyzes the Affiliate's historical and potential future operating performance, the Affiliate's historical and potential future rates of attrition among existing clients, the stability and longevity of existing client relationships, the Affiliate's recent and long-term investment performance, the characteristics of the firm's products and investment styles, the stability and depth of the Affiliate's management team and the Affiliate's history and perceived franchise or brand value. The Company's acquired intangible assets are predominately definite-life intangible assets and are generally amortized on a straight line basis over their estimated useful lives, ranging from five to sixteen years, reflecting the expected duration of such relationships. The Company does not hold any indefinite-lived intangible assets other than goodwill.
The Company tests for the possible impairment of acquired intangibles whenever events or changes in circumstances indicate that the carrying amount of the asset is not recoverable. If such indicators exist, the Company compares the undiscounted cash flows related to the asset to the carrying value of the asset. If the carrying value is greater than the undiscounted cash flow amount, an impairment charge is recorded in the Consolidated Statements of Operations for amounts necessary to reduce the carrying value of the asset to fair value. Intangible assets to be disposed of are reported at the lower of carrying value or fair value less cost to sell.
Goodwill
The Company records goodwill when the consideration paid in a business acquisition exceeds the fair value of the net total of tangible assets acquired, identifiable intangible assets acquired and liabilities assumed. Goodwill is not amortized, but rather is tested for impairment annually or more frequently if events or circumstances occur that indicate impairment may exist. Factors that could trigger an impairment review include significant underperformance relative to historical or projected future operating results, significant changes in the Company's use of the acquired assets in a business combination or the strategy for the Company's overall business, and significant negative industry or economic trends.
The Company performs its assessment for impairment of goodwill during the fourth quarter annually as of September 30, or as necessary, and the Company has determined that it has five reporting units, consisting of the five consolidated Affiliates. The Company first considers various qualitative factors to determine if it is more likely than not that the fair value of each of the reporting units is greater than its respective carrying amount, including goodwill. If the fair value of any reporting unit declines below its respective carrying amount, therefore indicating that impairment may exist, the impact would be determined at that point. For purposes of assessing potential impairment, the fair value of the reporting unit is estimated and compared to the carrying value of the reporting unit. The fair value of a reporting unit is based on discounted estimated future cash flows. The assumptions used to estimate fair value include management's estimates of future growth rates, operating cash flows, discount rates and terminal value. These assumptions and estimates can change in future periods based on market movement and factors impacting the expected business performance. Changes in assumptions or estimates could materially affect the determination of the fair value of a reporting unit. If it is determined that the carrying value of the reporting unit exceeds its fair value, the Company determines the implied fair value of the goodwill in the same manner used to determine the amount of goodwill in a business combination. If the carrying value of goodwill exceeds the implied fair value of the goodwill, an impairment charge is recognized in the amount equal to that excess. Based on the Company's most recent annual goodwill impairment test, the fair value of all its reporting units were in excess of their carrying value.
Leases
The Company and its Affiliates currently lease office space and equipment under various leasing arrangements, classified as operating leases. As these leases expire, it can be expected that in the normal course of business they will be renewed or replaced. Some lease agreements contain renewal options, rent escalation clauses or other inducements provided by the landlord. Rent expense is accrued to recognize lease escalation provisions and inducements provided by the landlord, if any, on a straight-line basis over the lease term.
Earnings per share
The Company calculates basic and diluted earnings per share ("EPS") by dividing net income for the year ended December 31, 2014 by its shares outstanding as outlined below. For periods prior to the Offering (described in Note 1), the Company is calculating pro forma basic and fully diluted EPS based upon 120 million pro forma shares, the number of shares outstanding following the Reorganization described in Note 1.
Basic EPS attributable to the Company's common shareholders is calculated by dividing "Net income attributable to controlling interests" by the weighted-average number of shares outstanding. Diluted EPS is similar to basic EPS, but adjusts for the effect of potential common shares unless they are antidilutive. For periods with a net loss, potential common shares are considered antidilutive.
The Company considers two ways to measure dilution to earnings per share: (a) calculate the net number of shares that would be issued assuming any related proceeds are used to buy back outstanding shares (the treasury stock method), or (b) assume the gross number of shares are issued and calculate any related effects on net income available for shareholders (the if-converted or two-class method). As appropriate, the Company's policy is to apply the more dilutive methodology upon issuance of such instruments.
Compensation arrangements
The Company operates short term variable compensation arrangements where generally, a percentage of each Affiliate's annual pre-variable compensation earnings, as defined in each arrangement, is allocated to a "pool" of each respective Affiliate's key employees, and subsequently distributed to individuals subject to recommendation and approval of a Remuneration Committee comprised of both the Company's and each respective Affiliate's management. Variable compensation expense is accrued and recognized in the Consolidated Statements of Operations as services are provided by individual employees. Variable compensation allocated to the "pools" of Affiliate key employees under the terms of the plans, where distribution has not yet been approved by the Remuneration Committee, is not recognized until the required service has been performed and the award is communicated to the individual.
The Company operates longer term profit-interest plans whereby certain Affiliate key employees are granted (or have a right to purchase) awards representing a profits interest in their respective Affiliate, as distinct from an equity interest due to the lack of pari passu voting rights. Under these plans, the Company may award a portion of the aforementioned variable compensation arrangement through issuance of a profits interest in the Affiliate. The awards generally have a three to five year vesting period from the grant date, and the service period begins at the commencement of the financial period to which the variable compensation relates. Under these plans, Affiliate key employees are eligible to share in the profits of their respective affiliates based on their respective percentage interest held.
In addition, under certain circumstances Affiliate key employees are eligible to receive a series of repurchase payments upon exiting the plans based on a multiple of the last twelve months profits of their respective Affiliate, as defined. Profits allocated and movements in the potential repurchase value, determined based on a fixed multiple times trailing twelve month profits, as defined, are recognized as compensation expense. Profits interests compensation liabilities are re-measured at each reporting date at the current trailing twelve month earnings multiple, with movements treated as compensation expense in the Company's Consolidated Statements of Operations.
Share-based compensation plans
The Company recognizes the cost of all share-based payments to directors, senior management and employees, including grants of restricted stock and stock options of its Parent and its Affiliates, as compensation expense in the Consolidated Statements of Operations over the respective vesting periods.
Awards made previously under the Parent's restricted stock and stock options plans are accounted for as equity settled, and the grant date fair value is recognized as compensation expense over the requisite service period, with a corresponding contribution to capital recorded. Options granted are measured at fair value using a standard option pricing valuation model. The valuation is consistent with generally accepted valuation methodologies for pricing financial instruments and incorporates all factors and assumptions that knowledgeable, willing market participants would consider in setting the price of the options.
In connection with the Offering, certain unvested restricted shares of the Parent were exchanged for unvested restricted shares of the Company. Awards made under the Company's equity plan are accounted for as equity settled, and the grant date fair value is recognized as compensation expense over the requisite service period, with a corresponding contribution to capital recorded.
Awards of equity made to Affiliate key employees are accounted for as cash settled, with the fair value recognized as compensation expense over the requisite service period, with a corresponding liability carried within other long term liabilities on the Consolidated Balance Sheet until the award is settled by the Company. The fair value of the liability is based on the expected cash to be paid, as determined according to trailing twelve months earnings multiples prescribed by each arrangement. The liability is revalued at each reporting period, with any movements recorded within compensation expense.
Deferred financing costs
The Company capitalizes certain legal, accounting and other third-party fees that are directly associated with in-process equity financings as other assets until such financings are consummated. After consummation of the equity financing, these costs are recorded in total equity as a reduction of Shareholders' equity generated as a result of the offering. At the time in which the equity financing is no longer considered probable of being consummated, the deferred financing costs are expensed immediately as a charge to operating expenses in the Consolidated Statement of Operations. Costs associated with an unconsummated transaction amounted to $0.0 million, $0.0 million, and $0.4 million expensed in the years ended December 31, 2014, 2013 and 2012, respectively.
Income taxes
The Company uses the asset and liability method of accounting for income taxes on a "separate return" basis. Under this method, a subsidiary is assumed to file a separate return with the taxing authority, thereby reporting its taxable income or loss and paying the applicable tax to or receiving the appropriate refund from the parent. The rules followed by the subsidiary in computing its tax or refund should be the same as those followed by a taxpayer filing directly with the taxing authority.
The Company files tax returns directly with the U.S. and state tax authorities and therefore, the computations under the separate return method follow the Company's filings.
Deferred income taxes are recognized for the effects of temporary differences between the tax basis of an asset or liability and its reported amount in the Consolidated Financial Statements. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date. The Company's deferred tax assets have been attributable to federal and state loss carry forwards, interest deductions, and accrued liabilities. Deferred tax liabilities have been attributable to undistributed earnings of subsidiaries.
Deferred income tax assets are subject to a valuation allowance if, in management's opinion, it is not more-likely-than-not that these benefits will be realized. In evaluating the Company's ability to recover its deferred tax assets, the Company considers all available positive and negative evidence including its past operating results, the existence of cumulative earnings or losses in the most recent years and its forecast of future taxable income. In estimating future taxable income, the Company develops assumptions including the amount of future pre-tax operating income and the reversal of temporary differences. These assumptions require significant judgment about the forecasts of future taxable income and are consistent with the plans and estimates the Company is using to manage the underlying businesses.
A tax benefit should only be recognized if it is more likely than not that the position will be sustained based on its technical merits. The Company recognizes the financial statement benefit of a tax position only after considering the probability that a tax authority would uphold the position in an examination. For tax positions meeting a "more-likely-than-not" threshold, the amount recognized in the financial statements is the largest amount of benefit greater than 50% likely of being sustained. The more-likely-than-not threshold must continue to be met in each reporting period to support continued recognition of the benefit. Unrecognized tax benefits and related interest and penalties, are adjusted periodically to reflect changing facts and circumstances. The Company's accounting policy is to classify interest and related charges as a component of income tax expense.
Non-controlling interests
Non-controlling interests in Consolidated Funds on the Consolidated Balance Sheets include undistributed income owned by the investors in the respective Funds. At December 31, 2013, the Company had non-controlling interests on the Consolidated Balance Sheets of $0.1 million representing equity arrangements for entities that are consolidated, but less than 100% owned. All non-controlling interests in these entities were acquired by the Company in 2014. The Company's consolidated net income on the Consolidated Statements of Operations includes the income (loss) attributable to non-controlling interest holders of these consolidated entities. Ownership interests held by Affiliate key employees are categorized as liabilities on the Consolidated Balance Sheets and are revalued each reporting date, with movements treated as compensation expense in the Consolidated Statements of Operations.
Redeemable non-controlling interests
The Company includes redeemable non-controlling interests related to certain consolidated Funds as temporary equity on the Consolidated Balance Sheets. Non-controlling interests in certain consolidated Funds are subject to monthly or quarterly redemption by the investors. When redeemable amounts become legally payable to investors, they are classified as a liability and included in other liabilities of consolidated Funds on the Consolidated Balance Sheets.
Other comprehensive income (loss)
Other comprehensive income (loss) is defined as the change in equity of a business enterprise during a period from transactions and other events and circumstances, excluding those resulting from investments by and distributions to owners. For the Company's purposes, comprehensive income (loss) represents net income/loss, as presented in the accompanying Consolidated Statements of Operations, adjusted for net foreign currency translation adjustments.
Restructuring costs
A liability for restructuring is recognized only after management has developed a formal plan, approved by the Board of Directors, to which it has committed. The costs included in a restructuring liability are those costs that are either incremental or incurred as a direct result of the plan, or are the result of a continuing contractual obligation with no continuing economic benefit to the Company, or a penalty incurred to cancel the contractual obligation. Refer to Note 22 for details of the Company's restructuring activities.
Recent accounting developments
In April 2014, the FASB issued ASU 2014-08, Presentation of Financial Statements and Property Plant and Equipment: Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. ASU 2014-08 amends the criteria for reporting a component of an entity as discontinued operations. The new guidance only allows disposals of components of an entity that represent a strategic shift or will have a major effect on operations to be classified as discontinued operations. Additionally, the guidance allows for an entity to have significant continuing involvement in the operations of a component after the disposal transaction. The new guidance is effective for interim and fiscal periods beginning on or after December 15, 2014. The Company has elected not to early adopt ASU 2014-08. The Company is evaluating the impact of ASU 2014-08, however it does not expect it to have a significant impact on its Consolidated Financial Statements.
In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers. ASU 2014-09 modifies existing U.S. GAAP revenue recognition standards to more closely align with international accounting standards. Additionally, the guidance requires improved disclosures around the nature, amount, timing and uncertainty of revenue recognized. This new guidance will be effective for annual reporting periods beginning after December 15, 2016 and early adoption is not permitted. The Company is evaluating the impact of ASU 2014-09, however it does not expect it to have a significant impact on its Consolidated Financial Statements.
In June 2014, the FASB issued ASU 2014-12, Compensation—Stock Compensation: Accounting for Share-Based Payments when the Terms of an Award Provide That a Performance Target Could Be Achieved after the Required Service Period. ASU 2014-12 requires that if an entity were to make a share-based payment award which includes terms that provide for a performance target that affects vesting, the entity must be treated as a performance condition. The new guidance is effective for interim and annual periods beginning after December 15, 2015. Early adoption is permitted and entities may elect to apply this ASU either prospectively for all awards or retrospectively for all awards with outstanding performance targets. The Company has not elected to early adopt ASU 2014-12. The Company is evaluating the impact of ASU 2014-12, however it does not expect it to have a significant impact on its Consolidated Financial Statements.
In November 2014, the FASB issued ASU 2014-16, Derivatives and Hedging: Determining Whether the Host Contract in a Hybrid Financial Instrument Issued in the Form of a Share Is More Akin to Debt or Equity. Entities may raise capital by issuing different classes of shares with certain preferences and voting rights, some of which may meet the definition of a derivative. For such instruments, ASU 2014-16 clarifies how an issuer or an investor should be interpreted in determining the nature of all stated and implied terms, while considering all the relevant facts and circumstances. ASU 2014-16 is effective for fiscal years beginning after December 15, 2016 and early adoption is permitted. The Company is evaluating the impact of ASU 2014-16, however it does not expect it to have a significant impact on its Consolidated Financial Statements.
In November 2014, the FASB issued ASU 2014-17, Business Combinations: Pushdown Accounting. ASU 2014-17 expands existing guidance for determining whether and at what threshold an acquired entity can reflect the acquirer's accounting and reporting basis, known as pushdown accounting. Under ASU 2014-17, an acquired entity may apply pushdown accounting upon occurrence of an event in which the acquirer obtains control. ASU 2014-17 is effective for an acquired entity's financial statements as of November 18, 2014.
In February 2015, the FASB issued ASU 2015-02, Consolidation: Amendments to the Consolidation Analysis. ASU 2015-02 rescinds the deferral of the consolidation rules under FAS 167, "Amendments to FASB Interpretation No. 46(R)", ("FAS 167") granted under ASU 2010-10, and will require all legal entities to be reevaluated under the revised consolidation model. The revised consolidation model provides updates when evaluating i) limited partnerships and similar entities currently under the voting interest model, ii) decision maker or service provider fees as a variable interest, iii) fee arrangements in the primary beneficiary determination, iv) related parties in the primary beneficiary determination, and v) certain investment funds. The amendments are intended to simplify the current consolidation model and reduce the number of consolidation entities by placing more emphasis on the risk of loss when determining a controlling financial interest. The amended guidance is effective for public entities for interim and annual periods beginning after December 15, 2015. Early adoption, including adoption in an interim period, is permitted. The Company is currently assessing the financial statement impact of the revised consolidation model and intends to early adopt ASU 2015-02 once the evaluation of the impact has been completed.

Investments

Investments	12 Months Ended
	Dec. 31, 2014
Investments
Investments
	3) Investments
	Investments are comprised of the following at December 31 (in millions):
		2014		2013
	Investments by consolidated Funds in related, unconsolidated master Funds	$	23.6	$	19.8
	Other investments of consolidated Funds attributable to non-controlling interests		37.0		386.4
	Investments of consolidated Funds attributable to non-controlling interests held at fair value		60.6		406.2
	Equity-accounted investments in unconsolidated Funds (Note 6)		34.5		43.1
	Other discretionary investments held at fair value		—		0.7
	Total investments in products held at fair value attributable to controlling interests		34.5		43.8
	Investments related to voluntary deferred compensation plans held at fair value		59.7		51.4
	Total investments held at fair value		154.8		501.4
	Equity-accounted investments in Affiliates (Note 6)		50.5		48.5
	Equity-accounted investments in unconsolidated Funds, at cost (Note 6)		0.5		—
	Investments in joint ventures		2.4		2.9
	Other investments		1.7		1.5
	Total investments per Consolidated Balance Sheet	$	209.9	$	554.3
	Investment income is comprised of the following for the years ended December 31 (in millions):
		2014		2013		2012
	Investment return of equity-accounted investments in unconsolidated Funds (Note 6)	$	1.9	$	2.9	$	1.7
	Realized and unrealized gains/losses on other discretionary investments held at fair value		0.7		0.1		—
	Total investment return on OMAM products		2.6		3.0		1.7
	Investment return of equity-accounted investments in Affiliates (Note 6)		9.6		7.7		14.8
	Total investment income per Consolidated Statement of Operations (Note 6)	$	12.2	$	10.7	$	16.5

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
Fair Value Measurements
Fair Value Measurements
	4) Fair Value Measurements
	The following table summarizes the Company's assets and liabilities that are measured at fair value on a recurring basis at December 31, 2014 (in millions):
			Quoted prices			Significant			Significant		Total value,
			in active			other			unobservable		December 31,
			markets			observable			inputs		2014
			(Level I)			inputs			(Level III)
						(Level II)
	Assets of OMAM and consolidated Funds(1)
	Investments owned, at fair value
	Common and preferred stock		$	24.8		$	—		$	—	$	24.8
	Short-term investment funds			0.1			—			—		0.1
	Fixed income securities			1.1			—			—		1.1
	Collective investment funds			—			32.5			—		32.5
	Other investments			0.3			1.8			—		2.1
	Total investments at fair value			26.3			34.3			—		60.6
	Restricted cash held at fair value			104.5			—			—		104.5
	Consolidated Funds Total			130.8			34.3			—		165.1
	Investment securities(2)			59.7			—			—		59.7
	Investments in unconsolidated Funds(3)			—			—			34.5		34.5
	OMAM Total			59.7			—			34.5		94.2
	Total fair value assets		$	190.5		$	34.3		$	34.5	$	259.3
	Liabilities of consolidated Funds(1)
	Common stock		$	(16.4	)	$	—		$	—	$	(16.4	)
	Total fair value liabilities		$	(16.4	)	$	—		$	—	$	(16.4	)
	The following table summarizes the Company's assets and liabilities that are measured at fair value on a recurring basis at December 31, 2013 (in millions):
			Quoted prices			Significant			Significant		Total value,
			in active			other			unobservable		December 31,
			markets			observable			inputs		2013
			(Level I)			inputs			(Level III)
						(Level II)
	Assets of OMAM and consolidated Funds(1)
	Investments owned, at fair value
	Common and preferred stock		$	52		$	—		$	—	$	52
	Short-term investment funds			8.8			—			—		8.8
	Fixed income securities			—			207			—		207
	Collective investment funds			—			9.1			—		9.1
	Corporate debt			—			54.1			—		54.1
	Other investments			0.9			70.2			—		71.1
	Derivatives			2.8			1.3			—		4.1
	Total investments at fair value			64.5			341.7			—		406.2
	Restricted cash held at fair value			80.5			93.6			—		174.1
	Consolidated Funds Total			145			435.3			—		580.3
	Investment securities(2)			52.1			—			—		52.1
	Investments in unconsolidated Funds(3)			—			—			43.1		43.1
	OMAM Total			52.1			—			43.1		95.2
	Total fair value assets		$	197.1		$	435.3		$	43.1	$	675.5
	Liabilities of consolidated Funds(1)
	Common stock		$	(24.6	)	$	—		$	—	$	(24.6	)
	Forward exchange contracts			(3.4	)		(0.1	)		—		(3.5	)
	Interest rate swaps			—			(0.1	)		—		(0.1	)
	Other derivatives			(0.2	)		(0.4	)		—		(0.6	)
	Total fair value liabilities		$	(28.2	)	$	(0.6	)	$	—	$	(28.8	)
	-1	Assets and liabilities measured at fair value are comprised of financial investments managed by the Company's Affiliates. $60.6 million in assets and $16.4 million in liabilities at December 31, 2014 and $406.2 million in assets and $28.8 million in liabilities at December 31, 2013 are the result of the consolidation of Funds sponsored by the Company's Affiliates.
		Of these, collective investment funds are multi-strategy products categorized as Level II because they are redeemable monthly and valued at net asset value per share of the fund without adjustment which the Company believes represents the fair value of the investments. The fair value of fixed income securities, corporate debt, and other investments is estimated based on quoted market prices, dealer quotations or alternative pricing sources supported by observable inputs and therefore classified within Level II. The Company obtains prices from independent pricing services that may utilize broker quotes, but generally the independent pricing services will use various other pricing techniques which take into account appropriate factors such as yield, quality, coupon rate, maturity, type of issue, trading characteristics and other data. The Company has not made adjustments to the prices provided. If the pricing services are only able to (a) obtain a single broker quote or (b) utilize a pricing model, such securities are classified as Level III. If the pricing services are unable to provide prices, the Company attempts to obtain one or more broker quotes directly from a dealer or values such securities at the last bid price obtained. In either case, such securities are classified as Level III. The Company performs due diligence procedures over third party pricing vendors to understand their methodology and controls to support their use in the valuation process to ensure compliance with required accounting disclosures.
		Equity, short-term investment funds and derivatives which are traded on a national securities exchange are stated at the last reported sales price on the day of valuation. To the extent these securities are actively traded and valuation adjustments are not applied, they are classified as Level I. These securities that trade in markets that are not considered to be active but are valued based on quoted market prices, dealer quotations or alternative pricing sources supported by observable inputs obtained by the Company from independent pricing services are classified as Level II.
	-2	Investment securities of $59.7 million and $52.1 million at December 31, 2014 and 2013, respectively, are investments in publicly registered daily redeemable funds (some managed by Affiliates), which the Company has classified as trading securities and valued using the published price as of the measurement dates. Accordingly, the Company has classified these investments as Level I.
	-3	The $34.5 million and $43.1 million at December 31, 2014 and December 31, 2013, respectively, relate to investments in unconsolidated Funds which consist primarily of investments in Funds advised by Affiliates and are valued using NAV which the Company relies on to determine their fair value. The NAVs that have been provided by investees have been derived from the fair values of the underlying investments as of the measurement dates. The Company has classified investments in unconsolidated Funds as Level III given the nature of redemption restrictions that are in place. These unconsolidated Funds consist primarily of real estate investments funds. These investments are subject to longer than monthly or quarterly redemption restrictions, and due to their nature, distributions are received only as cash flows are generated from underlying assets over the life of the Funds. The range of time over which the underlying assets are expected to be liquidated by the investees is approximately 1-8 years from December 31, 2014. The valuation process for the underlying real estate investments held by the real estate investments Funds begins with each property or loan being valued by the investment teams. The valuations are then reviewed and approved by the valuation committee, which consists of senior members of the portfolio management, acquisitions, and research teams. For certain properties and loans, the valuation process may also include a valuation by independent appraisers. In connection with this process, changes in fair-value measurements from period to period are evaluated for reasonableness, considering items such as market rents, capitalization and discount rates, and general economic and market conditions.
	The following table presents changes in Level III assets and liabilities, for the twelve months ended December 31, comprised of significant unobservable inputs:
			Investments in
			unconsolidated
			OMAM funds
	Balance, December 31, 2012		$	44.5
	Realized gain			7.1
Net change in unrealized depreciation			(4.2	)
Purchases, issuances or settlements			0.6
Dispositions			(4.9	)
Balance, December 31, 2013		$	43.1
Realized gain			1.9
Net change in unrealized depreciation			(5.1	)
Purchases, issuances or settlements			—
Dispositions			(5.4	)
Balance, December 31, 2014		$	34.5
Losses attributable to controlling interest recorded on our Consolidated Statements of Operations related to the above Level III changes were $3.2 million at December 31, 2014, while there were gains of $2.9 million and $1.7 million at December 31, 2013 and 2012, respectively. It is the Company's policy to value financial assets or liabilities transferred as of the beginning of the period in which the transfer occurs. There were no significant transfers of financial assets or liabilities among Levels I, II or III during the years ended December 31, 2014 and 2013.

Variable_Interest_Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2014
Variable Interest Entities
Variable Interest Entities
	5) Variable Interest Entities
	The Company sponsors the formation of various entities considered to be VIEs. The Company consolidates these entities pursuant to Accounting Standards Codification ("ASC") Topic 810 relating to the consolidation of VIEs. These VIEs are primarily Funds managed by Affiliates that qualify for the deferral granted under ASU 2010-10, "Amendments for Certain Investment Funds." As such, the Company evaluates these Funds for consolidation pursuant to FASB Interpretation No. 46(R), "Consolidation of Variable Interest Entities." These investment vehicles are typically owned entirely by third-party investors, however, certain Funds are capitalized with seed capital investments from the Company and its related parties and may be owned partially by Affiliate key employees and/or individuals that own minority interests in an Affiliate.
	The Company's determination of whether it is the primary beneficiary of a Fund that is a VIE is based in part on an assessment of whether or not the Company and its related parties are exposed to the majority of the risks and rewards of the entity. Typically the Fund's investors are entitled to substantially all of the economics of these VIEs with the exception of the management fees and performance fees, if any, earned by the Company or any investment the Company has made into the Funds. The Company generally is not the primary beneficiary of Fund VIEs created to manage assets for clients unless the Company's ownership interest, including interests of related parties, is substantial.
	The Company's Timber Funds do not qualify for the deferral under ASU 2010-10 and therefore must be evaluated for consolidation pursuant to FAS 167, "Amendments to FASB Interpretation No. 46(R)", ("FAS 167"). Under FAS 167, as codified by ASC 810, the trigger for consolidation of a VIE has been revised such that the Company must consolidate the VIE if the Company's interest in the VIE is significant to the VIE's economics.
	The following table presents the assets and liabilities of Funds that are VIEs and consolidated by the Company at December 31 (in millions):
			2014		2013
	Assets
	Investments at fair value		$	5.9	$	90.9
	Restricted cash			2,487.7		2,557.0
	Timber assets			4,053.2		4,172.5
	Other assets of consolidated Funds			165.0		145.0
	Total Assets		$	6,711.8	$	6,965.4
	Liabilities
	Borrowings		$	4,095.9	$	4,146.0
	Other liabilities of consolidated Funds			150.8		77.2
	Total Liabilities		$	4,246.7	$	4,223.2
	"Investments at fair value" consist of investments in securities and investments in related parties.
	The assets of consolidated VIEs presented in the table above belong to the investors in those Funds, are available for use only by the Fund to which they belong, and are not available for use by the Company. Any debt or liabilities held by consolidated Funds have no recourse to the Company's general credit. The Company also consolidates Funds that are not VIEs, and therefore the assets and liabilities of those Funds are not included in the table above.
	The Company's involvement with Funds that are VIEs and unconsolidated by the Company is generally limited to that of an investment manager and its investment in the unconsolidated VIE, if any. The Company's investment in any unconsolidated VIE generally represents an insignificant interest of the Fund's net assets and assets under management, such that the majority of the VIE's results are attributable to third parties. The Company's exposure to risk in these entities is generally limited to any capital contribution it has made or is required to make and any earned but uncollected management fees. The Company has not issued any investment performance guarantees to these VIEs or their investors.
	The following information pertains to unconsolidated VIEs for which the Company holds a variable interest at December 31 (in millions):
			2014		2013
	Unconsolidated VIE assets		$	9,993.5	$	12,156.8
	Unconsolidated VIE liabilities		$	1,515.0	$	1,720.4
	Equity interests on the Consolidated Balance Sheet		$	75.3	$	78.4
	Maximum risk of loss(1)		$	75.5	$	81.1
	-1	Includes equity investments the Company has made or is required to make and any earned but uncollected management/incentive fees. The Company does not record performance/incentive allocations until the respective measurement period has ended.
	In addition to the multiple unconsolidated VIE Funds, the Company determined that Heitman LLC, one of the Company's Affiliates, is a VIE. The Company concluded that it is not the primary beneficiary of Heitman LLC because it does not hold the power to direct its most economically significant activities. The assets and liabilities of Heitman LLC include the management company itself as well as certain funds that Heitman LLC consolidates. The Company aggregated Heitman LLC with the Company's other unconsolidated VIE Funds due to their similar risk profiles given that the risks and rewards are driven by changes in investment values and the Affiliates' ability to manage those assets.

Equity_Accounted_Investees

Equity Accounted Investees	12 Months Ended
	Dec. 31, 2014
Equity Accounted Investees
Equity Accounted Investees
	6) Equity Accounted Investees
	The following tables present summarized financial information for Affiliates and Funds accounted for under the equity method (in millions):
			For the year ended December 31, 2014								For the year ended December 31, 2013
	Statements of Income		Heitman LLC		Other			Total			Heitman LLC		Other			Total
	Net revenues(1)		$	227.4	$	89.1		$	316.5		$	218.3	$	80.1		$	298.4
	Operating income			51		17.2			68.2			49		20.8			69.8
	Other income (expense), net			26.1		(102.1	)		(76.0	)		172.8		(13.4	)		159.4
	Income (loss) before income taxes			77.1		(84.9	)		(7.8	)		221.8		7.4			229.2
	Less income tax expense (benefit)			3		1.9			4.9			1.8		(0.4	)		1.4
	Excluding noncontrolling interests income (loss)			58.6		(89.8	)		(31.2	)		197.2		7.6			204.8
	Net income attributable to controlling interests		$	15.5	$	3		$	18.5		$	22.8	$	0.2		$	23
	OMAM equity in net income of equity method investees		$	8.5	$	3		$	11.5		$	10.4	$	0.2		$	10.6
			For the year ended December 31, 2012
	Statements of Income (cont.)		Heitman LLC		Other			Total
	Net revenues(1)		$	242.3	$	85		$	327.3
	Operating income			72.2		26.6			98.8
	Other income (expense), net			129.3		(66.9	)		62.4
	Income (loss) before income taxes			201.5		(40.3	)		161.2
	Less income tax expense			0.6		—			0.6
	Excluding noncontrolling interests income (loss)			173.6		(42.7	)		130.9
	Net income attributable to controlling interests		$	27.3	$	2.4		$	29.7
	OMAM equity in net income of equity method investees		$	14.1	$	2.4		$	16.5
			As of December 31, 2014								As of December 31, 2013
	Balance Sheets		Heitman LLC		Other			Total			Heitman LLC		Other			Total
	Current assets		$	103.9	$	546.6		$	650.5		$	125.7	$	58.7		$	184.4
	Noncurrent assets			1,543.2		773.3			2,316.5			1,785.4		1,027.4			2,812.8
	Total assets			1,647.1		1,319.9			2,967.0			1,911.1		1,086.1			2,997.2
	Current liabilities			65.8		210.5			276.3			65.9		378.9			444.8
	Long-term liabilities			515.3		342.3			857.6			645.4		48.8			694.2
	Non-controlling interests in subsidiaries			1,014.4		756.9			1,771.3			1,140.2		643.7			1,783.9
	Members' equity		$	51.6	$	10.2		$	61.8		$	59.6	$	14.7		$	74.3
	OMAM equity investment and undistributed earnings of affiliated companies, before consolidating and reconciling adjustments		$	44.7	$	10.2		$	54.9		$	47.1	$	14.7		$	61.8
	Consolidating and reconciling adjustments:
	Goodwill attributable to equity method investment			30.6		—			30.6			29.8		—			29.8
	OMAM investment in equity method investees at cost plus equity in undistributable earnings since acquisition		$	75.3	$	10.2		$	85.5		$	76.9	$	14.7		$	91.6
	-1	Net revenue includes advisory fees for asset management services and investment income, including interest and dividends from consolidated investment partnerships.
	During the period, certain Affiliates held investments in joint ventures. These investments were accounted for using the equity method of accounting. Acadian Asset Management LLC had a joint venture investment in Acadian Asset Management (Australia) Limited. Net loss in the Consolidated Statement of Operations includes $1.4 million, $2.1 million, and $2.4 million of income for the years ended December 31, 2014, 2013 and 2012, respectively, and investment in joint ventures includes $2.4 million and $2.9 million for the years ending at December 31, 2014 and 2013, respectively. There are no material differences between the carrying value of these investments and the amounts of their underlying net asset value.

Property_and_Equipment_and_Lea

Property and Equipment and Lease Commitments	12 Months Ended
	Dec. 31, 2014
Property and Equipment and Lease Commitments
Property and Equipment and Lease Commitments
	7) Property and Equipment and Lease Commitments
	Property and equipment consisted of the following at December 31 (in millions):
		2014			2013
	Leasehold improvements	$	26.7		$	27.6
	Office equipment		17.5			24.4
	Furniture and fixtures		6.6			8
	Software and web development		14.3			24.9
	Total property and equipment, at cost		65.1			84.9
	Accumulated depreciation and amortization		(41.0	)		(60.8	)
	Property and equipment, net	$	24.1		$	24.1
	Depreciation and software and web development amortization expense for continuing operations was $6.1 million, $4.9 million, and $5.8 million for the years ended December 31, 2014, 2013, and 2012, respectively.
	The Company and its Affiliates lease office space for their operations. At December 31, 2014, the Company's aggregate future minimum payments for operating leases having initial or non-cancelable lease terms greater than one year are (in millions):
		Gross			Sub-lease			Net
		minimum			rentals			minimum
		rentals						rentals
	2015	$	11.7		$	(0.2	)	$	11.5
	2016		11			—			11
	2017		10.2			—			10.2
	2018		9.8			—			9.8
	2019		9.5			—			9.5
	Thereafter		22.7			—			22.7
	Total	$	74.9		$	(0.2	)	$	74.7
	The Company is responsible for other expenses under these leases as well. Such expenses include operating costs, insurance, taxes and broker fees. Consolidated rent & occupancy expenses for 2014, 2013, and 2012 were $10.6 million, $8.8 million, and $8.0 million respectively.
	The Company's Affiliates also have timber lease rights for use in their continuing operations. At December 31, 2014, the Company's unrecognized aggregate future minimum payments for timber rights leases having initial or non-cancelable lease terms greater than one year are (in millions):
		Gross			Sub-lease			Net
		minimum			rentals			minimum
		rentals						rentals
	2015	$	1.2		$	—		$	1.2
	2016		1.1			—			1.1
	2017		1.1			—			1.1
	2018		1.0			—			1.0
	2019		1.1			—			1.1
	Thereafter		13.1			—			13.1
	Total	$	18.6		$	—		$	18.6
	Consolidated Funds' timber lease rights expense for 2014, 2013, and 2012 was $10.7 million, $9.2 million, and $9.2 million, respectively.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure
Goodwill and Intangible Assets
	8) Goodwill and Intangible Assets
	The following table presents the changes in goodwill in 2014, and 2013 (in millions):
		Gross			Accumulated			Net Book
		Book Value			Impairment			Value
	Balance at December 31, 2012	$	160.6		$	(42.8	)	$	117.8
	Impairments		—			—			—
	Disposals		—			—			—
	Balance at December 31, 2013	$	160.6		$	(42.8	)	$	117.8
	Impairments		—			—			—
	Additions		11			—			11
	Disposals		(11.2	)		8.9			(2.3	)
	Balance at December 31, 2014	$	160.4		$	(33.9	)	$	126.5
	During its annual impairment assessment of goodwill, the Company recognized charges of $0.0 million in 2014, $0.0 million in 2013, and $7.6 million in 2012 reflecting the excess by which certain Affiliates' carrying amount, including allocated goodwill, exceeded fair value. The amount of the impairment charge attributable to continuing operations was $0.0 million in 2014, $0.0 million in 2013, and $1.7 million in 2012. The amount of the impairment charge attributable to discontinued operations was $0.0 million in 2014, $0.0 million in 2013, and $5.9 million in 2012. The impairment amount represents the write down necessary to adjust the Affiliates' goodwill to equal current fair value. Fair value is determined using a discounted cash flow analysis performed for each Affiliate, derived based on appropriate assumptions around long-term growth projections and discount rates. The amount of the disposal charge attributable to discontinued operations was $11.2 million in 2014. The disposal amount represents the write down necessary as a result of the transfer of Rogge Global Partners plc to the Company's Parent.
	The following table presents the change in acquired intangible assets in 2014, 2013, and 2012 composed of client relationships (in millions):
		Gross			Accumulated			Net Book
		Book Value			Amortization &			Value
					Impairment
	Balance at December 31, 2012	$	26.8		$	(25.4	)	$	1.4
	Amortization		—			(0.2	)		(0.2	)
	Balance at December 31, 2013	$	26.8		$	(25.6	)	$	1.2
	Amortization		—			(0.1	)		(0.1	)
	Disposals		(4.1	)		4			(0.1	)
	Balance at December 31, 2014	$	22.7		$	(21.7	)	$	1
	The Company's definite-lived acquired intangibles are amortized over their expected useful lives. As of December 31, 2014, these assets were being amortized over an average remaining useful life of nine years. The Company recorded amortization expense of $0.1 million, $0.2 million, and $2.3 million, respectively, for the years ended December 31, 2014, 2013 and 2012. The amount of amortization attributable to continuing operations was $0.1 million, $0.1 million, and $0.1 million for the years ended December 31, 2014, 2013, and 2012, respectively. The amount of amortization attributable to discontinued operations was $0.0 million, $0.1 million, and $2.2 million for the years ended December 31, 2014, 2013, and 2012, respectively.
	The Company recorded impairment charges of $24.5 million in relation to discontinued operations in 2012 as a result of ongoing operating losses and management's subsequent decision to sell these businesses, at which point in time it was determined that the carrying amount of their intangibles exceeded the amount expected to be recovered through their sale. All disposal charges have been included in discontinued operations.
	The Company estimates that its consolidated annual amortization expense, assuming no useful life changes or additional investments in new or existing Affiliates, for each of the next five fiscal years is as follows (in millions):
	2015	$	0.1
	2016		0.1
	2017		0.1
	2018		0.1
	2019		0.1
	2020 and thereafter		0.5
	Total	$	1.0

Timber_and_Timberlands

Timber and Timberlands	12 Months Ended
	Dec. 31, 2014
Timber and Timberlands
Timber and Timberlands
	9) Timber and Timberlands
	Timber and timberlands consisted of the following at December 31 (in millions):
			2014			2013
	Timber		$	2,813.70		$	3,027.70
	Timberlands			1,880.50			1,913.60
	Timber lease rights			198.8			198.8
	Other(1)			27.1			74.7
	Total timber and timberlands, at cost			4,920.10			5,214.80
	Accumulated depletion on timber			(866.0	)		(791.9	)
	Accumulated amortization			(0.9	)		(0.8	)
	Timber and timberlands, net		$	4,053.20		$	4,422.10
	-1	The category "Other" includes buildings, roads, quarries, hunting lease rights and other similar tangible and intangible assets related to timber cutting operations.
	In the year ended December 31, 2014, the Company deconsolidated a Timber Fund.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2014
Related Party Transactions
Related Party Transactions
	10) Related Party Transactions
	Amounts due from related parties were comprised of the following at December 31 (in millions):
			2014		2013
	Interest receivable from Parent(1)		$	—	$	1.8
	Fees receivable from unconsolidated Funds			18.2		26.8
	Fees receivable from commonly controlled Old Mutual plc business units			2.3		2.2
	Receivable from joint venture partners and other			5.3		7.6
	Other amounts due from Parent			1.8		0.1
	Other amounts due from related parties			0.6		0.2
	Total current receivables from related parties			28.2		38.7
	Other long-term amounts due from Parent			—		2.1
	Loan notes receivable from Parent(1)			—		30.1
	Total long-term receivables from related parties			—		32.2
	Total amounts due from related parties		$	28.2	$	70.9
	Amounts due to related parties were comprised of the following at December 31 (in millions):
			2014		2013
	Interest payable to Parent (Note 13)		$	—	$	14.6
	Other amounts due to related parties			0.4		1.0
	Loan notes payable to Parent (Note 13)			37.0		—
	Preferred dividend payable of consolidated Fund			16.3		16.3
	Other amounts due to Parent(2)			3.5		—
	Total current payables to related parties			57.2		31.9
	Revolving credit facility payable to Parent (Note 13)			—		140.7
	Loan notes payable to Parent (Note 13)			—		900.0
	Other amounts due to Parent(2)			286.1		—
	Promissory note payable to related parties of consolidated Fund (Note 13)			318.7		604.7
	Total long-term payables to related parties			604.8		1,645.4
	Total amounts due to related parties		$	662.0	$	1,677.3
	Investments in related parties consisted of the following at December 31 (in millions):
			2014		2013
	Investment in unconsolidated master Funds(3)		$	23.6	$	19.8
	Investments in joint ventures			2.4		2.9
	Investments in equity-accounted investees (Note 6)			85.5		91.6
	Total related party investments		$	111.5	$	114.3
	Related party transactions included in the Company's Consolidated Statement of Operations for the years ended December 31 consisted of (in millions):
			2014		2013		2012
	Management fees collected from commonly controlled Old Mutual business units(3)		$	10.6	$	9.6	$	12.2
	Management fees collected from unconsolidated Funds(1)			47.5		46.4		43.3
	Performance fees collected (performance penalties paid) from (to) unconsolidated Funds(1)			5.9		0.5		(0.2	)
	Management fees collected from joint venture partners			6.4		13.7		11
	Total related party revenues (including discontinued operations)			70.4		70.2		66.3
	Interest expense owed to parent (Note 13)			49.8		72.1		84.1
	Rent and administrative costs recharged by commonly controlled Old Mutual business units(4)			1.2		0.1		1.7
	Restricted stock grants of parent equity to OMAM employees (Note 18)			4.5		5		2.9
	Recharged parent operational costs(5)			5.5		5.3		5.5
	Total related party expenses (including discontinued operations)		$	61	$	82.5	$	94.2
	-1	Transactions with unconsolidated Affiliate-sponsored Funds are considered related party items on the basis of the Company's significant influence over the activities of such entities in its capacity as investment advisor thereto. These transactions are comprised of fees for advisory services and investments in unconsolidated "master" Funds held by consolidated "feeder" Funds.
	-2	During 2014 the Company entered into arrangements with the Parent for the payment of realized benefits associated with certain deferred tax assets, as well as co-investments made by the Company in real-estate and timber strategies of its Affiliates. In accordance with these arrangements, the Company has recorded a liability of $289.5 million as of December 31, 2014. The Company will make quarterly payments to Parents as the benefits under these arrangements become realized.
	-3	The Company provides sub-advisory services in the ordinary course of business to commonly controlled Old Mutual business units. Management fees include amounts earned from these related parties. For the years ended December 31, 2014, 2013, and 2012, $0.3 million, $0.0 million, and $4.6 million, respectively, were earned from discontinued operations.
	-4	The Company conducts a portion of its distribution activities out of the United Kingdom, and has entered into contractual arrangements with a Related Business Unit domiciled there to share its premises and leverage certain of its administrative functions.
	-5	The Company's Parent provides the Company with various oversight services, including governance, which includes compensation for board and executive committees, investor relations, procurement of insurance coverage, human resources, financial reporting, internal audit, treasury, systems, risk and tax services. That portion of the above costs which (i) are directly attributable to the Company, (ii) have been charged to the Company by the Company's Parent and (iii) have been paid to the Parent by the Company, have been recorded in the Company's Consolidated Financial Statements and were $2.1 million, $2.0 million, and $2.7 million for the years ended December 31, 2014, 2013, and 2012, respectively. With respect to the above services which were not directly attributable to the Company, costs associated with these services were generally allocated based on the Company's proportion of the total Parent's consolidated, normalized revenues. In the years ended December 31, 2014, 2013 and 2012, $3.4 million, $3.3 million, and $2.8 million, respectively, of these costs incurred have been allocated to the Company through a non-cash contribution to Parent equity, with the balance of the charges settled in cash. Subsequent to the Offering, these general costs are no longer allocated and if required, are borne directly by the Company.
	Other related party arrangements
	In December 2011 the Company's Parent transferred a loan note receivable with a carrying value of $30.1 million to the Company from a commonly controlled business unit (sister entity). The acquisition of the loan note was funded via a non-cash contribution to capital from the Company's Parent. The loan note, issued by the Parent, earned interest at the two year U.S dollar swap rate plus 7.28%. Interest was payable annually in arrears. During 2014, the loan note receivable was redeemed via capital redemption to the Parent in the Company's Consolidated Financial Statements.
	The Company has entered into a sub-lease arrangement with a Related Business Unit subsidiary of the Parent in relation to premises it continues to lease in respect of a discontinued operation. During 2009, as of the date this operation was discontinued, the Company recorded a liability in respect of the present value of future lease payments it remained contractually obligated to incur, net of the future sub-lease income on the intercompany sub-lease arrangement (see Note 7). During the years ended December 31, 2014, 2013, and 2012 the Company received sub-lease payments of $1.0 million, $1.0 million and $1.2 million, respectively, as a result of this related party arrangement.
	In certain instances the Company pays the compensation for employees of Related Business Units who are based at its location. Conversely, employees of the Company operating at locations of Related Business Units are paid by those entities. In both cases these costs are recharged back to the business to which the employee is providing services.
	As part of its profit-interests plan, an Affiliate made tax payments on behalf of its employees who became vested in profit interests of the Affiliate. Payments totaling $5.3 million, and $4.5 million made in the years ended December 31, 2014, and 2013, respectively, are included on the Company's balance sheet in Other assets. The balance as of December 31, 2014 was repaid by the employees of the Affiliate by February 2015.
	The Company uses the equity-method to account for its interests in Affiliates where it exercises significant influence over their operations, but does not hold a controlling interest, as well as its joint venture partners. During 2014, 2013 and 2012, the Company recorded earnings in respect of these investees of $9.8 million, $9.8 million and $17.2 million respectively. During 2014, 2013 and 2012 respectively, the Company received dividends from joint ventures of $1.2 million, $1.9 million and $1.2 million, and the Company recharged expenses of $0.3 million, $0.3 million and $0.3 million to joint venture partners during the same respective periods. The Company also exercises significant influence over unconsolidated Funds; however in order to report in a manner consistent with consolidated Funds, it has elected to apply the fair value option for its investments therein. Total investment return recognized during 2014, 2013 and 2012 in respect of these entities was $(3.2) million, $2.9 million and $1.7 million respectively. Additional information with respect to equity-method investees is disclosed in Note 6.
	On September 29, 2014, the Company entered into a loan note with its Parent. The loan note was issued in the amount of $37.0 million and does not bear interest. It has a ten year term and calls for quarterly repayments amounting to the greater of the company's excess cash, as defined in loan note, or $1.0 million, whichever is greater. (See Note 13.)
	During 2014, the Company's Parent contributed its intercompany debt to the Company in return for an issuance of shares by OMAM. The elimination of this intercompany debt is reflected as a capital contribution in the Company's Consolidated Financial Statements.
	As the Company is a member of a group of related businesses, it is possible that the terms of certain related party transactions are not the same as those that would result from transactions with wholly unrelated parties.

Accounts_Payable_and_Accrued_L

Accounts Payable and Accrued Liabilities	12 Months Ended
	Dec. 31, 2014
Accounts Payable and Accrued Liabilities
Accounts Payable and Accrued Liabilities
	11) Accounts Payable and Accrued Liabilities
	Accounts payable and accrued liabilities consisted of the following at December 31 (in millions):
		2014		2013
	Accounts payable	$	10.5	$	16.3
	Accrued expenses		26.1		25.8
	Forward foreign exchange contract liability		—		0.1
	Other		2.9		1.7
	Total accounts payable and accruals	$	39.5	$	43.9

Other_Compensation_Liabilities

Other Compensation Liabilities	12 Months Ended
	Dec. 31, 2014
Other Compensation Liabilities
Other Compensation Liabilities	12) Other Compensation Liabilities
	Other compensation liabilities consisted of the following at December 31 (in millions):
		2014		2013
	Share-based payments liability (Note 18)	$	42.3	$	86.0
	Non-current compensation payable		2.7		2.2
	Profit interests compensation liability (Note 2)		123.8		77.2
	Voluntary deferral plan liability (Note 17)		59.5		51.2
	Total other compensation liabilities	$	228.3	$	216.6
	Profit interests compensation expense including discontinued operations in 2013 and 2012 amounted to $51.0 million in 2014, $29.0 million in 2013, and $12.3 million in 2012. Issuances of additional profit sharing interests to key employees for cash amounted to $0.6 million in 2014, $0.2 million in 2013, and $0.0 million in 2012. Redemption of profit sharing interests by OMAM from key employees for cash were $6.8 million in 2014, $0.9 million in 2013, and $0.4 million in 2012.

Borrowings_and_Debt

Borrowings and Debt	12 Months Ended
	Dec. 31, 2014
Borrowings and Debt
Borrowings and Debt	13) Borrowings and Debt
	The Company's long term debt at December 31, excluding the long term debt of the Company's consolidated Funds was comprised of the following (in millions):
	(in millions)		2014		2013		Interest rate		Maturity
	Third party obligations:
	Revolving credit facility			177.0		—	LIBOR + 1.50%		October 15, 2019
							plus 0.25%
							commitment fee
	Term loan two			—		2.5	5.23%		August 15, 2014
	Total third party obligations			177.0		2.5
	Related party obligations:
	Loan note two			37.0		—	0.00%		September 29, 2024
	Related party credit facility		$	—	$	140.7	LIBOR + 5.58%		March 31, 2018
							plus 0.50% fee
							on undrawn amounts
	Term loan one			—		900.0	6.34%		September 30, 2015
	Total long term debt of the Company		$	214.0	$	1,043.2
	The fair value of borrowings approximated net cost basis as of December 31, 2014 and 2013. Fair value was determined based on future cash flows, discounted to present value using current market rates. The inputs are categorized as Level III in the fair value hierarchy, as defined in Note 4, "Fair Value Measurement."
	Revolving credit facility
	On October 15, 2014, the Company entered into a revolving credit facility with Citibank, as administrative agent and issuing bank, Citigroup Global Markets Inc. and Merrill Lynch, Piece, Fenner & Smith Incorporated as joint lead arrangers and joint book runners (the "Credit Facility"). Pursuant to the terms of the Credit Facility, the Company may obtain loans on a revolving credit basis and procure the issuance of letters of credit in an aggregate amount at any time outstanding not in excess of $350 million. The Credit Facility has a maturity date of October 15, 2019. Borrowings under the credit facility will bear interest, at OMAM's option, at either the per annum rate equal to (a) the greatest of (i) the prime rate, (ii) the federal funds effective rate plus 0.5% and (iii) the one month Adjusted LIBO Rate plus 1.0%, plus, in each case an additional amount ranging from 0.25% to 1.00%, with such additional amount being based from time to time on the ratio of the Company's total consolidated indebtedness to Adjusted EBITDA (a "Leverage Ratio") until either Moody's Investor Service, Inc. or Standard & Poor's has assigned an initial rating to the Company's senior, unsecured long-term indebtedness for borrowed money that is not subject to credit enhancement, or its credit rating, at which time such additional amount will be based on its credit rating or (b) the London interbank offered rate for a period, at the Company's election, equal to one, two, three or six months plus an additional amount ranging from 1.25% to 2.00%, with such additional amount being based from time to time on the Company's Leverage Ratio until it has been assigned a credit rating, at which time such additional amount will be based on its credit rating. In addition, the Company will be charged a commitment fee based on the average daily unused portion of the revolving credit facility at a per annum rate ranging from 0.20% to 0.50%, with such amount being based from time to time on its Leverage Ratio until it has been assigned a credit rating, at which time such amount will be based on the Company's credit rating. Under the Credit Facility, the ratio of third-party borrowings to trailing twelve months Adjusted EBITDA cannot exceed 3.0x, and the interest coverage ratio must not be less than 4.0x. On October 15, 2014, the Company drew $177.0 million on this facility of which $175.0 million was paid to the Parent to satisfy loan note one pursuant to the Reorganization described more fully in Note 1. As the Company is yet to receive a credit rating and in accordance with the terms of the Credit Facility an interest rate of LIBOR plus a margin of 1.50% and commitment fee rate of 0.25% is being charged. At December 31, 2014, the Company's ratio of third-party borrowings to trailing twelve months Adjusted EBITDA was 0.8x.
	Term loan two
	On September 30, 2010, the Company entered into a $16.5 million term note to American AgCredit, PCA. The note was repayable in installments of $0.5 million on December 1, 2012, $12.0 million on November 1, 2013, $1.5 million on December 15, 2013 and $2.5 million on August 15, 2014. The note bore interest at a rate of 5.23% per annum and was paid out of a third party-funded interest reserve account at no cost to the Company. The note was fully repaid in August 2014.
	Loan note one and loan note two
	On September 29, 2014, the Company entered into loan note one and loan note two with its Parent. Loan note one was issued in the amount of $175.0 million, accrues interest at 3% per annum and was payable in full on its maturity date, September 29, 2015. On October 15, 2014, the Company repaid loan note one upon the closing of its new revolving credit facility. Loan note two was issued in the amount of $37.0 million and does not bear interest. Loan note two has a ten year term and calls for quarterly repayments amounting to the greater of the Company's excess cash, as defined in loan note two, or $1.0 million, whichever is greater.
	Related party credit facility
	On September 30, 2005, the Company entered into a five year revolving credit facility with its Parent where the Parent agreed to make available up to an aggregate maximum amount of $850.0 million to facilitate cash transfers between the Company and Parent. The agreement was subsequently amended effective September 30, 2010 to extend the maturity date by 12 months. The agreement was again amended effective September 30, 2011 to extend maturity date to March 28, 2013, adjust the contractual interest rate from LIBOR + 1.65% to LIBOR + 5.58% and adjust the commitment fee on undrawn amounts from 0.82% per annum to 1.95% per annum. During March 2013, the Company and its Parent agreed to extend the agreement through March 31, 2018, lower the facility to $750 million and reduce the fee on undrawn amounts to 0.5%. The Company made repayments of $140.7 million, $90.8 million and $50.3 million during the years ended December 31, 2014, 2013 and 2012, respectively. In connection with the Reorganization discussed further in Note 1, the Parent made a capital contribution to the Company in the amount of the outstanding principal on the Related party credit facility.
	Term loan one
	On December 31, 2008, the Company issued a $900.0 million promissory note to its Parent. The note was due on September 30, 2015 and bore interest at a rate of 6.34% per annum. In connection with the Reorganization the Parent made a capital contribution to the Company in the amount of the outstanding principal on Term loan one.
	Interest expense amounted to $50.6 million, $72.2 million and $84.1 million for the years ended December 31, 2014, 2013 and 2012 respectively. The weighted average interest rate on all debt obligations, excluding consolidated Funds, was 1.43%, 6.53% and 7.30% in each of 2014, 2013 and 2012, respectively.
	Borrowings and debt of consolidated funds
	The long term debt of the Company's consolidated Funds was comprised of the following at December 31 (in millions):
	(in millions)		2014		2013		Interest rate		Maturity
	Related party obligations:
	Shareholder loans and note interest		$	318.7	$	339.7	BBSW* + 5.5%		Oct-22
	Promissory note			—		265.0	4.00%		Aug-19
	Total related party obligations:			318.7		604.7
	Third party obligations:
	Term loan A			163.0		163.0	6% - 6.26%		May-16
	Term loan B			261.3		261.5	5.93% – LIBOR + 1.61%		October 1, 2016
	Senior secured notes			860.0		860.0	6.19% - 6.38%		December 1, 2019
	Secured bank loan			109.7		115.4	variable		Oct-17
	Notes payable			2,383.2		2,383.2	LIBOR + margin		Oct-27
	Total third party obligations:			3,777.2		3,783.1
	Total long term debt of consolidated Funds		$	4,095.9	$	4,387.8
	*	BBSW refers to the Australian Bank-Bill Reference Rate
	The fair value of borrowings was approximately $3,794.1 million and $4,600.3 million as of December 31, 2014 and 2013, respectively. Fair value was determined based on future cash flows, discounted to present value using current market rates. The inputs are categorized as Level III in the fair value hierarchy, as defined in Note 4, "Fair Value Measurement."
	Related party obligations
	Shareholder loans and note interest
	A Fund consolidated by the Company has borrowed $318.7 million from a related party. The note is collateralized by assets of the Fund. Interest accrues at an annual rate of BBSW plus a margin of 5.5% and is due to mature in October 2022.
	Promissory note
	A Fund consolidated by the Company borrowed $265.0 million on a ten-year, $269.0 million Promissory Note, secured by Deeds of Trust, from a Fund's common limited partner. Interest payments were due annually. The Fund records interest expense using the effective-interest method, which is different from the contractual rate, taking into consideration an increase from 4% to 11% that went into effect from August 2014. In 2014, the Company deconsolidated the Fund associated with the Promissory Note.
	Third Party Obligations
	Term loan A
	Term Loan A is collateralized by a consolidated Fund's assets and contains various restrictive covenants which limit the incurrence of additional indebtedness and require the Fund to maintain minimum amounts of interest coverage and earnings before interest, taxes, depreciation, depletion and amortization ("EBITDDA"). The loan is comprised of three tranches totaling $163.0 million. Interest accrues at fixed rates between 5.875% and 6.135% per annum among the tranches, but is subject to an increase of 0.125% upon certain events. The rate of interest for the three tranches was between 6.0% and 6.26% for each of the years ended December 31, 2014 and 2013. Interest is payable semi-annually in arrears. The loan requires no principal payment until maturity in May 2016, except for prepayment requirements upon certain events.
	Term loan B
	Term loan B is collateralized by a consolidated Fund's assets, and contains various restrictive covenants, which limit the incurrence of additional indebtedness and require the fund to maintain minimum amounts of interest coverage and EBITDDA. The first tranche of $259.0 million has a fixed interest rate of 5.93% per annum, but is subject to an increase of 0.25% upon certain events. The second tranche of $2.3 million has a variable rate of LIBOR plus an applicable margin, which was set at a rate of 1.48% for the year ended December 31, 2014 and 1.61% for the year ended December 31, 2013. Interest is payable semi-annually in arrears. The loan requires no principal payment until maturity in October 2016, except for prepayment requirements upon certain events.
	Senior secured notes
	The total loan commitment of $860 million as of December 31, 2014 and 2013 across five tranches is collateralized by a consolidated Fund's assets, and contains various restrictive covenants that limited the incurrence of additional indebtedness and required the Fund to maintain minimum amounts of interest coverage and EBITDDA. The rate of interest on each individual note is fixed, subject to an increase of 0.25% upon certain events. The rate of interest for the three tranches was between 6.19% and 6.38% for each of the years ended December 31, 2014 and 2013. Interest is payable semi-annually. The loan requires principal payments of the five tranches in order from December 2014 to December 2019.
	Secured bank loan
	A Fund consolidated by the Company has borrowed $109.7 million and $115.4 million as of December 31, 2014 and 2013, respectively, through a secured bank loan which is collateralized by the Fund's assets. Interest accrues at a variable rate and the loan is due to mature in October 2017.
	Notes payable
	A Fund consolidated by the Company issued notes in the amount of $2,383.2 million at December 31, 2014 and 2013. Interest on the notes, based on LIBOR plus a margin, is payable quarterly and reset at the same time. A letter of credit was issued to the third-party by four separate banks as security for the notes. The notes are due October 2027. The note payable is secured by restricted cash contributed by the limited partners of the Fund.
	Total interest expense recognized in relation to debt from consolidated Funds during the years ended December 31, 2014, 2013 and 2012 respectively, was $135.5 million, $149.3 million and $127.2 million.
	As of December 31, 2014, the aggregate maturities of debt commitments, based on their contractual terms, are as follows:
			Long term		Long term		Future
debt of			debt of		minimum
OMAM			consolidated		debt
			Funds		commitments
2015		$	37.0	$	20.0	$	57.0
2016			—		444.3		444.3
2017			—		189.7		189.7
2018			—		75.0		75.0
2019			177.0		665.0		842.0
Thereafter			—		2,701.9		2,701.9
Total		$	214.0	$	4,095.9	$	4,309.9
The Company and its consolidated Funds were in compliance with the required covenants related to borrowings and debt facilities as of December 31, 2014.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Taxes
Income Taxes	14) Income Taxes
	The components of income tax expense from continuing operations for the years ended December 31 are as follows (in millions):
		2014			2013			2012
	Current:
	Federal	$	41.6		$	—		$	—
	State		5.1			4.5			(8.0	)
	Foreign		1.3			0.5			0.6
	Total current		48			5			(7.4	)
	Deferred:
	Federal		(37.4	)		12			20.6
	State		0.5			(3.9	)		(10.8	)
	Foreign		1.7			0.2			0.9
	Total deferred		(35.2	)		8.3			10.7
	Total tax expense	$	12.8		$	13.3		$	3.3
	Income tax expense (benefit) of $1.0 million, $5.2 million, and $(3.7) million in the years ended December 31, 2014, 2013, and 2012, respectively, are included in discontinued operations. Income tax expense (benefit) of $1.5 million, $(2.3) million, and $7.7 million in the years ended December 31, 2014, 2013, and 2012, respectively, are included in gain (loss) on disposal of discontinued operations.
	The provision for income taxes in 2014, 2013, and 2012 included benefits of $1.6 million, $33.8 million, and $23.9 million respectively, related to the utilization of net operating loss carryforwards.
	Due to the use of federal net operating loss carry forwards and an election pursuant to Internal Revenue Code § 172(b)(1)(H), the Company's current federal tax expense for the years ended December 31, 2013, and 2012 was reduced to zero.
	The reconciliation of the difference between the Company's U.S. Federal statutory income tax rate and the effective income tax rate for continuing operations for the years ended December 31 is as follows:
		2014			2013			2012
	Tax at U.S. federal statutory income tax rate		35.0	%		35.0	%		35.0	%
	State income taxes, net of federal benefit		(7.3	%)		(2.7	%)		(3.1	%)
	Non-deductible expenses		1.6	%		(0.1	%)		—
	Interest expense		14.7	%		—			—
	Dividends from foreign subsidiaries		(6.6	%)		—			(0.5	%)
	Parent company expense carve-out adjustment		(3.6	%)		(1.4	%)		(2.1	%)
	IPO preparation costs		—			—			(0.3	%)
	Adjustment to liabilities for uncertain tax positions		2.2	%		1.3	%		19.6	%
	Change in valuation allowance		34.9	%		1.0	%		2.5	%
	Effect of foreign operations		2.5	%		0.7	%		1.1	%
	Effect of changes in tax law, rates		(10.8	%)		(1.6	%)		(0.1	%)
	Effect of income from non-controlling interest		(108.4	%)		(48.6	%)		(55.5	%)
	Other		6.1	%		0.5	%		(3.7	%)
	Effective income tax rate for continuing operations		(39.7	%)		(15.9	%)		(7.1	%)
	During 2014, the Company released $11.3 million of its valuation allowance relating to the federal net operating loss carryforwards of Skandia America Corporation, as management has concluded that the tax benefits will be fully realized following restructuring which occurred in 2014.
	In 2014, 2013, and 2012 the Company received dividends from foreign operations for which the benefit from foreign tax credits will not be realized.
	In general, it is the practice and intention of the Company to reinvest earnings of its non-U.S. subsidiaries in those operations. Management has no intention of repatriating earnings of its non-U.S. subsidiaries in the foreseeable future. As such, at December 31, 2014, the Company has not recorded any deferred tax liabilities relating to additional tax on unremitted earnings of its non-U.S. subsidiaries. The Company's foreign unremitted earnings that are indefinitely reinvested are estimated to be $14.8 million at December 31, 2014. It is not practicable to estimate the amount of deferred tax liability related to investments in these foreign subsidiaries.
	Deferred tax assets and liabilities reflect the expected future tax consequences of temporary differences between the book carrying amounts and tax bases of the Company's assets and liabilities.
	The significant components of deferred tax assets and deferred tax liabilities for the years ended December 31 are as follows (in millions):
		2014			2013
	Deferred tax assets:
	Interest expense	$	181.1		$	193.3
	Federal net operating loss		12.7			12.8
	State net operating loss carry forwards		27.2			28.4
	Investment partnerships		121			82.7
	Foreign tax credit carry forwards		6.4			6.4
	Intangible assets		2.5			3.4
	Employee compensation		8.8			4.7
	Other		4.5			8.8
	Total deferred tax assets		364.2			340.5
	Valuation allowance		(33.9	)		(45.9	)
	Deferred tax assets, net of valuation allowance		330.3			294.6
	Deferred tax liabilities:
	Undistributed earnings of subsidiaries		—			0.4
	Net deferred tax asset	$	330.3		$	294.2
	At December 31, 2014, the Company has tax attributes that carry forward for varying periods. The Company's federal net operating loss carryforward of $30.2 million predominately originated during 2007 and 2008 and will expire over an 11 to 15 year period. State net operating losses of $482.2 million expire over a 1 to 15-year period. The Company has recorded a valuation allowance in connection with state net operating loss carryforwards and foreign tax credit carryforwards for which the Company believes it is more likely than not that the tax benefits will not be recognized. In evaluating the Company's ability to recover its deferred tax assets, the Company considers all available positive and negative evidence including the existence of cumulative income in the most recent fiscal years, changes in the business in which the Company operates, and the Company's ability to forecast future taxable income. The weight given to the evidence is commensurate with the extent to which it can be objectively verified. The more negative evidence that exists, the more positive evidence is necessary and the more difficult it is to support a conclusion that a valuation allowance is not needed. The Company has three years of cumulative earnings as of December 31, 2014, 2013, and 2012. As of December 31, 2014, management believes it is more likely than not that the balance of the deferred tax asset will be realized based on forecasted taxable income.
	A reconciliation of the change in gross unrecognized tax benefits for the years ended December 31 is as follows (in millions):
		2014			2013			2012
	Balance as of January 1	$	97.2		$	106.2		$	119.7
	Additions based on tax positions of prior years		—			0.1			0.5
	Reductions for tax provisions of prior years		(1.5	)		(6.9	)		—
	Reductions related to lapses of statutes of limitations		(1.8	)		(2.2	)		(13.8	)
	Settlements		—			—			(0.2	)
	Balance as of December 31	$	93.9		$	97.2		$	106.2
	The Company's liability for uncertain tax positions includes benefits of $93.2 million and $94.4 million at December 31, 2014 and 2013, respectively, that if recognized would affect the effective tax rate on income from continuing operations.
The Company recognized $0.0 million, $(0.4) million, and $(1.2) million in interest and penalties in its income tax provision for the years ended December 31, 2014, 2013, and 2012, respectively. The amounts related for the years ended December 31, 2013 and 2012 have been corrected from previously disclosed $(0.2) million and $0.2 million for the years ended December 31, 2013 and 2012 respectively.
The Company recognizes accrued interest and penalties relating to unrecognized tax benefits as income tax expense. The Company's liability for uncertain tax benefits at December 31, 2014, 2013 and 2012 includes accrued interest and penalties of $1.4 million, $1.4 million, and $1.9 million, respectively. The amounts related for the years ended December 31, 2013 and 2012 have been corrected from previously disclosed $4.0 million and $4.2 million at December 31, 2013 and 2012, respectively.
The Company believes that it is reasonably possible that a decrease of up to $0.6 million in unrecognized tax benefits relating to the Company's state tax exposures may be necessary within the next 12 months, as the result of a lapse of statute of limitations.
The Company is periodically under examination by various taxing authorities. The Company has paid all assessments relating to closed examinations.
The Company and its subsidiaries file tax returns in U.S. federal, state, local, and foreign jurisdictions. As of December 31, 2014, the Company is generally no longer subject to income tax examinations by U.S. federal, state, local, or foreign tax authorities for calendar years prior to 2007.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies
Commitments and Contingencies
	15) Commitments and Contingencies
	Operational commitments
	As of December 31, 2013, the Company had maximum potential contingent acquisition payment obligations of $11.0 million related to the acquisition of an Affiliate in a prior period. As a result of specific hurdles being met during 2014 this amount has now been settled in full.
	As of December 31, 2014, the Company had commitments to invest up to $30 million in co-investments with an Affiliate. These commitments will be funded as required through the end of the respective investment periods ranging through fiscal 2015.
	Certain Affiliates operate under regulatory authorities that require that they maintain minimum financial or capital requirements. Management is not aware of any violations of such financial requirements occurring during the period.
	Litigation
	The Company and its Affiliates are subject to claims, legal proceedings and other contingencies in the ordinary course of their business activities. Each of these matters is subject to various uncertainties, and it is possible that some of these matters may be resolved in a manner unfavorable to the Company or its Affiliates. The Company and its Affiliates establish accruals for matters for which the outcome is probable and can be reasonably estimated. Management believes that any liability in excess of these accruals upon the ultimate resolution of these matters will not have a material adverse effect on the Consolidated Financial Statements or results of operations of the Company. As of December 31, 2014, there were no accruals for claims, legal proceedings or other contingencies.
	Indemnifications
	In the normal course of business, such as through agreements to enter into business combinations and divestitures of Affiliates, the Company enters into contracts that contain a variety of representations and warranties and which provide general indemnifications. The Company's maximum exposure under these arrangements is unknown, as this would involve future claims that may be made against the Company that have not yet occurred.
	Foreign tax contingency
	The Company has clients in non-U.S. jurisdictions which require entities that are conducting certain business activities in such jurisdictions to collect and remit tax assessed on certain fees paid for goods and services provided. The Company does not believe this requirement is applicable based on its limited business activities in these jurisdictions. However, given the fact that uncertainty exists around the requirement, the Company has chosen to evaluate its potential exposure related to non-collection and remittance of these taxes. At December 31, 2014, management of the Company has estimated the potential maximum exposure to be approximately $9 million. However, no accrual for the potential exposure has been recorded as the probability of incurring any potential liability relating to this exposure is not probable at December 31, 2014.
	Considerations of credit risk
	Financial instruments that potentially subject the Company to significant concentrations of credit risk consist principally of cash investments. The Company maintains cash and cash equivalents and short term investments with various financial institutions. These financial institutions are typically located in cities in which the Company and its Affiliates operate. For the Company and certain Affiliates, cash deposits at a financial institution may exceed Federal Deposit Insurance Corporation insurance limits.

Earnings_Per_Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share
Earnings Per Share	16) Earnings Per Share
	The calculation of basic and diluted earnings per ordinary share for the years ended December 31, 2014, 2013 and 2012 is as follows (in millions, except per share data):
			2014		2013		2012
	Numerator:
	Net income attributable to controlling interests		$	51.7	$	25.7	$	3.0
	Denominator:
	Weighted-average ordinary shares outstanding—basic*			120,000,000		120,000,000		120,000,000
	Weighted-average ordinary shares outstanding—diluted*			120,000,000		120,000,000		120,000,000
	Pro forma earnings per ordinary share attributable to controlling interests:
	Basic		$	0.43	$	0.21	$	0.03
	Diluted		$	0.43	$	0.21	$	0.03
	*	Reflects pro forma shares outstanding for the periods prior to the Offering on October 8, 2014.
	Included in basic ordinary shares outstanding are 1,212,766 restricted ordinary shares converted from restricted shares of the Company's Parent prior to the Offering. The holders of these restricted ordinary shares are entitled to the same rights and privileges, including the participation in earnings at the conversion and during the vesting period of the shares, as outstanding ordinary shares and as such these shares are considered participating securities. The restricted ordinary shares are subject to the same rights as the other basic ordinary shares resulting in equivalent earnings per ordinary share.

Employee_Benefits

Employee Benefits	12 Months Ended
	Dec. 31, 2014
Employee Benefits
Employee Benefits
	17) Employee Benefits
	The Company has various defined contribution plans covering substantially all of its full-time employees and several of its Affiliates. In addition to pre-tax contributions made by employees, the Company also makes contributions to the qualified plans annually.
	The Company also has non-qualified defined contribution plans covering certain senior employees. The Company has established a Deferred Compensation Plan under which the Board of Directors makes awards that may be invested by the recipient in investments deemed available under the plan. Vesting of awards under the Deferred Compensation Plan is based on the number of years of service already provided by the employee at the date of the grant. In addition, the Company has established a Voluntary Deferral Plan that provides officers of the Company the opportunity to voluntarily defer a portion of their compensation. The compensation deferred is deemed to be invested in one or more investment options available under the plan. These non-qualified plans are unfunded, although the Company does make contributions to a Rabbi Trust to hedge its risks in terms of providing returns to employees on their deemed investments held in the plan.
	As of December 31, 2014, and 2013, a total of $59.5 million and $51.2 million, respectively, had been recorded as other non-current liabilities and a total of $59.7 million and $51.4 million, respectively, had been invested under the Deferred Compensation and Voluntary Deferral plans. The Company recorded total expenses in relation to its qualified and non-qualified plans within compensation and benefits in its Consolidated Statements of Operations for the years ended December 31, 2014, 2013, and 2012 of $10.8 million, $8.7 million, and $6.5 million, respectively.

Equitybased_Compensation

Equity-based Compensation	12 Months Ended
	Dec. 31, 2014
Equity-based Compensation
Equity-based Compensation	18) Equity-based Compensation
	Cash-settled Affiliate awards
	The Company has entered into compensation arrangements with several of its Affiliates whereby in exchange for continued service, Affiliate equity is either purchased by or granted to Affiliate key employees subject to a limit imposed by the Company, and may be repurchased either by Affiliate key employees or by the Company at a future date at the then applicable fair value, subject to service requirements having been met. Compensation expense is recognized over the requisite service period equal to the cumulative vested fair value of the award at the end of each period up to vesting date.
	The Company accounts for these arrangements as "cash settled" share based payments, and accordingly a corresponding share-based payments liability is recorded. Vested share-based payments liabilities are revalued at each period end until settlement date, with changes in the liabilities included within compensation expense.
	The following table presents the changes in the share-based payments liability for the years ended December 31 (in millions):
		2014			2013			2012
	Balance, beginning of period	$	86		$	65.8		$	47.3
	Amortization and revaluation of granted awards		43.4			30			19.1
	Reclassification of modified equity-settled award		—			0.9			3.6
	Reclassification to profit-interests award		(1.7	)		—			—
	Affiliate disposals		(18.0	)		—			(2.4	)
	Repurchases by OMAM (cash settled)		(67.4	)		(10.7	)		(1.8	)
	Balance, end of period	$	42.3		$	86		$	65.8
	The amount of unrecognized compensation expense in relation to non-vested cash-settled equity interests as of December 31, 2014 is $4.3 million, and will be expensed as follows (in millions):
	2015	$	1.7
	2016		1.7
	2017		0.9
	Total	$	4.3
	Equity-settled Affiliate awards
	Class B equity interests in Acadian Asset Management ("AAM") were acquired by employees during 2007 entitling the participating employees to 28.57% of the earnings of AAM in excess of the Company's Class A equity interest minimum preference, and to a liquidation preference proportionate to their shareholding. In consideration for the equity acquired, the participating employees agreed to forego a portion of existing long-term incentive payments owed. The difference between the carrying amount of this consideration and the fair value of the interest acquired was treated as share-based compensation expense. Fair value was determined based on the discounted projected future cash flows of AAM, amounting to $42.5 million at the grant date.
	Effective April 1, 2011, certain terms of the plan were modified to provide for greater participation by Class B interest holders in Acadian's profits and cash distributions. In addition, provisions were added to provide greater liquidity and transferability to the holders of Class B interests. The plan was also amended to include a feature whereby participating employees may redeem their equity based on a multiple of prior twelve-month earnings above a Class A equity holders' minimum preference amount, subject to certain restrictions. The surrender-date fair value of the Class B interests prior to these modifications amounted to $7.2 million, and this amount has been reclassified from non-controlling interests to cash-settled share-based payments liabilities as a result of the liquidity features added. For the years ending December 31, 2014, 2013, and 2012, $0.0 million, $0.9 million, and $3.6 million were reclassified, respectively. The excess of the fair value of the modified award over its pre-modification fair value was $21.1 million and was accounted for as incremental cash-settled share-based payments compensation expense and liability. As the implementation of the modifications were subject to a two year vesting period, the incremental cash-settled share-based payments compensation expense and subsequent revaluations of the liability to its fair value each period, along with the reclassification of the $7.2 million pre-modification fair value of the award from non-controlling interests as a liability is being recognized ratably over that period commencing April 1, 2011. The remaining $35.3 million of the initial fair value of the equity-settled plan that was surrendered by Class B interest holders was transferred from non-controlling interests to the parent equity (deficit) at the modification date.
	Equity-settled corporate awards
	Old Mutual plc equity compensation plans
	Old Mutual plc, the Company's Parent, maintains various equity-based compensation arrangements, including stock options and restricted stock awards, in which the Company's employees participated in the periods presented. The cost of these equity-based programs has been included in the Company's financial results where applicable. Compensation expense recognized by the Company in respect of these arrangements was $4.5 million for the year ended December 31, 2014, $5.0 million for the year ended December 31, 2013, and $2.9 million for the year ended December 31, 2012. A corresponding capital contribution was recognized in each period. The related income tax benefit recognized for the years ended December 31, 2014, 2013, and 2012 was $1.7 million, $1.8 million, and $0.8 million, respectively.
	The following disclosures represent the Company's portion of the various equity compensation arrangements maintained by the Parent in which the Company's employees participated.
	Options for shares in Old Mutual plc traded on the London Stock Exchange
	An Affiliate of the Company that was disposed of during the year ended December 31, 2014 participated in a plan featuring options over Old Mutual plc shares. Shares granted during the years ended December 31, 2014, and 2013 were 249,821 and 93,410, respectively. As the Affiliate was disposed of during the year, there were no shares outstanding or exercisable at December 31, 2014. Shares outstanding at December 31, 2013 were 437,999. These options had an exercise price in the range of $0.58 to $2.55 and a weighted average remaining contractual life of 1.2 years.
	The weighted average share price at date of exercise for options exercised during the year was $3.30 and $0.94 at December 31, 2014 and 2013, respectively. For the year ended December 31, 2014, the weighted average exercise price was $1.44. The Company recognized expense in connection with the exercise of options of $0.2 million, $0.1 million, and $0.1 million for the years ended December 31, 2014, 2013, and 2012, respectively. This expense is classified within discontinued operations. Refer to Note 22, "Discontinued Operations and Restructuring" for additional information.
	Prior to disposal the estimated fair value of options awarded was $0.2 million for the year ended December 31, 2014 and $0.1 million for the year ended December 31, 2013. The fair value of services received in return for share options granted are measured by reference to the fair value of share options granted. The estimate of the fair value of share options granted is measured using a Black-Scholes option pricing model.
	Grants of restricted shares in Old Mutual plc traded on the London Stock Exchange
	The following summarizes the grant date fair value of restricted shares granted by the Company in the years ended December 31:
		2014			2013			2012
	Shares granted during the year		3,576,379			1,996,967			1,682,389
	Weighted average grant date fair value per share GBP	£	2.03		£	1.94		£	1.57
	Weighted average grant date fair value per share USD	$	3.35		$	3.03		£	2.49
	The grant date fair value per share, calculated based on the closing share price as quoted on the London Stock Exchange on the measurement date, was used to determine the fair value of restricted shares granted to employees. There is a mechanism at Old Mutual plc to ensure sufficient shares are available under the plan each year for grants issued. Restricted shares under the plan generally have a vesting period of three years. Expected dividends were not incorporated into the measurement of fair value where the holder of the restricted share is entitled to dividends throughout the vesting period.
	The following table summarizes the activity related to restricted shares.
		2014									2013							2012
		Number of			Weighted			Weighted			Number of			Weighted		Weighted		Number of			Weighted		Weighted
		shares			average			average			shares			average		average		shares			average		average
					exercise			exercise						exercise		exercise					exercise		exercise
					price GBP			price USD						price GBP		price USD					price GBP		price USD
	Outstanding at the beginning of the year		3,954,534			£1.73		$	2.85			2,888,925			£1.47	$	2.3		3,103,308			£1.03	$	1.63
	Granted during the year		3,576,379			2.03			3.35			1,996,967			1.94		3.03		1,682,389			1.57		2.49
	Forfeited during the year		(10,711	)		2.03			3.35			(64,778	)		1.51		2.36		—			—		—
	Exercised during the year		(878,217	)		1.45			2.39			(543,708	)		1.25		1.95		(1,882,278	)		0.88		1.4
	Expired during the year		—			—			—			—			—		—		(34,190	)		1.31		2
	Other transfers		(5,959,639	)		n/a			n/a			(322,872	)		—		—		19,696			n/a		—
	Outstanding at the end of the year		682,346			£1.77		$	2.92			3,954,534			£1.73	$	2.7		2,888,925			£1.47	$	2.33
	The grant date for the annual awards is deemed to be January 1 in the year prior to the date of issue. There are no planned future awards of Old Mutual Plc restricted shares. The fair value of awards granted in 2014 with a grant date of January 1, 2013 was $8.1 million, consisting of 2,416,327 shares. The fair value of awards granted in 2013 with a grant date of January 1, 2012 was $6.1 million, consisting of 1,996,967 shares. The fair value of awards granted in 2012 with a grant date of January 1, 2011 was $4.2 million, consisting of 1,682,389 shares.
	Value incentive plan
	During 2011, an equity-based compensation plan was implemented for certain key employees of OMAM in connection with the stated intention of exploring a potential initial public offering ("IPO") of the business. The plan was designed to reward participants for achievement of strategic objectives and metrics and value creation over the period leading up to an initial public offering. The awards consisted of a mix of cash, payable at completion of an IPO, and restricted shares in the newly-listed U.S. entity, which would be granted upon completion of an IPO and vest ratably over three years from that date. As a result of the IPO not occurring before the plan termination date of December 31, 2013, the awards under this plan were paid out in cash and grants of restricted shares in Old Mutual plc during 2014. The value and quantity of the cash and share portions of the awards were based on the achievement of performance objectives and financial targets. The share-based payment liability previously recorded for the share portion of this plan was reclassified to share-based payment reserve upon the granting of the awards in Old Mutual Plc restricted shares. The expense recognized during the years ended December 31, 2014, 2013, and 2012 in relation to this plan was $1.0 million $3.8 million, and $2.4 million respectively. The amount of unrecognized expense as of December 31, 2014 was $1.1 million, which will be recognized over 2015-2016 at $0.5 million per annum. The total income tax benefit recognized in relation to this plan for the years ended December 31, 2014, 2013 and 2012 was $0.4 million, $1.6 million, and $0.9 million, respectively.
	OM Asset Management equity incentive plan
	In connection with the IPO, certain employees who held unvested Old Mutual plc restricted shares were given the opportunity to exchange their Old Mutual plc restricted shares for restricted shares of OMAM held by OM Group (UK) Limited with vesting conditions similar to those to which they were currently subject. These restricted shares were awarded to employees as part of the annual incentive process and the one-time Value Incentive Plan. This exchange program was intended to provide employees who elected to participate with restricted share awards of OMAM ordinary shares of equivalent value to the Old Mutual plc restricted shares they currently held. The exchange valued OMAM ordinary shares at the price sold to investors in the IPO. The exchange valued Old Mutual plc's ordinary shares using the weighted-average sale price over the three consecutive trading days on the London Stock Exchange up to and including the date of the exchange. The exchange occurred following the effectiveness of the OMAM registration statement on October 8, 2014. OM Group (UK) Limited transferred 1,212,766 unvested restricted OM Asset Management ordinary shares (Equivalent to 5,914,981 Old Mutual plc restricted shares) to employees as part of this exchange program.
	In connection with the Reorganization, an equity plan was implemented at OMAM. The plan is intended to encourage ownership of ordinary shares by employees and to provide additional incentive for them to promote the success of OMAM's business through the grant of awards of or pertaining to ordinary shares of the Company. The grant date fair value per share, calculated based on the closing share price as quoted on the New York Stock Exchange on the measurement date, is used to determine the fair value of restricted shares granted to employees. There is a mechanism at OMAM to ensure sufficient shares are available under the plan for grants issued. Restricted shares under the plan generally have a vesting period of three years.
	The following table summarizes the activity related to restricted shares for the year ended December 31, 2014.
		2014
		Number of			Weighted
		shares			average
					grant date
					fair value
					per share
	Outstanding at the beginning of the year		—		$	—
	Converted during the year		1,212,766			14
Forfeited during the year		(10,225	)		15.46
Other transfers		10,225			15.46
Outstanding at the end of the year		1,212,766		$	14

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2014
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income
	19) Accumulated Other Comprehensive Income
	The components of accumulated other comprehensive income at December 31, were as follows (in millions) including proportions attributable to non-controlling interests:
		2014			2013			2012
	Foreign currency translation including proportion attributable to non-controlling interests	$	(20.4	)	$	(17.9	)	$	1.2

Noncontrolling_interests

Non-controlling interests	12 Months Ended
	Dec. 31, 2014
Noncontrolling Interests
Noncontrolling Interests
	20) Non-controlling interests
	Net income attributable to non-controlling interests in the Consolidated Statements of Operations is comprised of the income allocated to equity-holders of consolidated entities, other than OMAM. Non-controlling interests on the Consolidated Balance Sheets includes capital and undistributed profits attributable to those equity holders, which amounted to $0.0 million at December 31, 2014, $0.1 million at December 31, 2013, and $0.9 million at December 31, 2012.
	Non-controlling interests in consolidated Funds
	Net loss attributable to non-controlling interests in consolidated Funds in the Consolidated Statements of Operations is comprised of the net income or loss and net gains and losses allocated to equity-holders, other than OMAM, of consolidated Funds. For the years ended December 31, 2014, 2013, and 2012 this net loss was $(95.5) million, $(122.3) million, and $(69.2) million, respectively. Non-controlling interests in consolidated Funds on the Consolidated Balance Sheets represents the share of net assets of the funds attributable to those equity holders who are restricted in their ability to redeem their interests, which amounted to $2,459.0 million at December 31, 2014, and $2,579.3 million at December 31, 2013.
	Redeemable non-controlling interests in consolidated Funds on the Consolidated Balance Sheets represents the share of net assets of the Funds attributable to those equity holders who are not restricted in their ability to redeem their interests, which amounted to $61.9 million at December 31, 2014, and $403.3 million at December 31, 2013.

Funds_Derivatives_and_Hedging

Funds' Derivatives and Hedging	12 Months Ended
	Dec. 31, 2014
Funds' Derivatives and Hedging
Funds' Derivatives and Hedging	21) Funds' Derivatives and Hedging
	The Company enters into the following types of derivatives:
	Forward foreign currency exchange contracts:    The Funds are subject to foreign currency exchange rate risk in the normal course of pursuing their investment objectives. A forward foreign currency exchange contract is an agreement between two parties to purchase or sell a specific currency for an agreed-upon price at a future date. The Funds enter into forward foreign currency exchange contracts to facilitate transactions in foreign-denominated securities and to attempt to minimize the risk to the Funds from adverse changes in the relationship between currencies. Forward foreign currency exchange contracts are recorded at the forward rate and marked-to-market daily. When the contracts are closed, realized gains and losses arising from such transactions are recorded as realized gains or losses on foreign currency transactions. The Funds could be exposed to risks if the counterparties to the contracts are unable to meet the terms of their contracts or if the value of the foreign currency changes unfavorably. The Funds' maximum risk of loss from counterparty credit risk is the unrealized gains or losses on the contracts. This risk is mitigated by having a master netting arrangement between the Funds and the counterparty.
	Credit default swaps:    The Funds are subject to credit risk in the normal course of pursuing their investment objectives. The Funds entered into credit default swaps to manage their exposure to the market or certain sectors of the market, to reduce their risk exposure to defaults of corporate and sovereign issuers, or to create exposure to corporate or sovereign issuers to which they are not otherwise exposed. Credit default swaps involve the exchange of a fixed rate premium for protection against the loss in value of an underlying security in the event of a defined credit event, such as payment default or bankruptcy. Under a credit default swap one party acts as a guarantor by receiving the fixed periodic payment in exchange for the commitment to purchase the underlying security at par if the defined credit event occurs. Upon the occurrence of a defined credit event, the difference between the value of the reference obligation and the swaps notional amount is recorded as realized gain (for protection written) or loss (for protection sold) on swap transactions in the consolidated statement of operations. The Funds maximum risk of loss from counterparty risk, either as the protection seller or as the protection buyer, is the fair value of the contract. This risk is mitigated by having a master netting arrangement between the Funds and the counterparty and by the posting of collateral by the counterparty to the Funds to cover the Funds' exposure to the counterparty.
	Interest rate swaps:    The Funds are subject to interest rate risk exposure in the normal course of pursuing their investment objectives. Because the Funds hold fixed rate bonds, the value of these bonds may decrease if interest rates rise. To help hedge against this risk and to maintain their ability to generate income at prevailing market rates, the Funds entered into interest rate swap contracts. Interest rate swaps are agreements between two parties to exchange cash flows based on a notional principal amount. The Funds may elect to pay a fixed rate and receive a floating rate, or receive a fixed rate and pay a floating rate on a notional principal amount. The net interest received or paid on interest rate swap agreements is recorded as realized gains or losses. Interest rate swaps are marked to market daily based upon quotations from the market makers and the change, if any, is recorded as an unrealized gain or loss in the consolidated statement of operations. When the swap contract is terminated earlier, the Funds record a realized gain or loss equal to the difference between the current realized value and the expected cash flows. The risk of interest rate swaps include changes in market conditions that will affect the value of the contract or the cash flows and the possible inability of the counterparty to fulfill its obligations under the agreement. The Funds' maximum risk of loss from counterparty credit risk is the discounted net value of the cash flows to be received from the counterparty over the contract's remaining life, to the extent that that amount is positive. The risk is mitigated by having a master netting arrangement between the Funds and the counterparty and by the posting of collateral by the counterparty to the Funds to cover the Funds' exposure to the counterparty.
	Financial futures contracts:    Certain of the Funds may enter into futures contracts for liquidity and hedging purposes. The potential risk to the Funds is that the change in value of futures contracts may not correspond to the change in value of the hedged instruments. In addition, losses may arise from changes in the value of the underlying instruments, if there is an illiquid secondary market for the contracts, or if the counterparty to the contract is unable to perform. Risks may exceed amounts recognized on the consolidated balance sheet. When the contract is closed, the Funds recognize a realized gain or loss equal to the difference between the value of the contract at the time it was opened and the value at the time it was closed. Upon entering into a financial futures contract, the Funds are required to pledge to the broker an amount of cash and/or other assets equal to a certain percentage of the contract amount, known as initial margin deposit. Futures contracts are valued at the quoted daily settlement prices established by the exchange on which they trade. The Funds agree to receive from, or pay to, the broker an amount of cash equal to the daily fluctuation in the value of the futures contract. Such receipts or payments are known as variation margin. At December 31, 2014, the Funds had no open futures contracts.
	Certain of the Funds' derivative instruments contain provisions that allow for early termination of those derivative contracts if the net assets of the Funds decline by certain thresholds within specified periods of time. If the Funds' net assets were to fall below these thresholds it would be in violation of these provisions and the counterparties to the derivative instruments could request immediate payment or demand immediate and ongoing full overnight collateralization on derivative instruments in net liability positions. If the credit-risk-related contingent features underlying these agreements were triggered on December 31, 2014, the Funds would not be required to post any additional collateral to their counterparties, as the Funds were in a gain position.
	The average value of derivative instruments during the year ended December 31, 2014 was as follows (in millions):
		2014			2013
	Average notional value of swaps	$	0.4		$	7.1
	Average value of contracts to buy	$	3.0		$	14.0
	Average value of contracts to sell	$	2.7		$	11.5
	The fair values of derivatives were as follows at December 31 (in millions):
		Balance sheet classification				2014						2013
		within consolidated funds
		Assets		Liabilities		Assets			Liabilities			Assets			Liabilities
	Derivatives with unrealized gains & losses:
	Forward foreign currency exchange contracts	Other assets		Other liabilities		$	0.5		$	—		$	2.2		$	3.5
	Interest rate contracts	Other assets		Other liabilities			0.4			—			1.4			0.2
	Warrants	Investments		N/A			0.1			—			—			—
	Total return swap contracts	Other assets		Other liabilities			—			—			0.1			0.1
	Other derivatives	Investments		Other liabilities			—			—			0.4			0.4
	Total					$	1.0		$	—		$	4.1		$	4.2
	The effect of derivative instruments on the Company's Consolidated Statements of Operations for the years ended December 31 were as follows (in millions):
				2014						2013						2012
		Income statement classification		Gains			Losses			Gains			Losses			Gains		Losses
	Realized gains (losses):
	Forward foreign currency exchange contracts	OMAM funds net gains (losses):		$	0.1		$	—		$	—		$	(0.1	)	$	0.9		—
	Total return swap contracts	OMAM funds net gains (losses):			—			(0.3	)		—			—			—		—
	Unrealized gains (losses):
	Forward foreign currency exchange contracts	OMAM funds net gains (losses):			—			—			—			(1.7	)		—		—
	Interest rate contracts	OMAM funds net gains (losses):			—			(0.4	)		0.5			—			—		—
	Other derivatives	OMAM funds net gains (losses):			—			—			1.1			—			—		—
	Net change in unrealized appreciation:
	Forward foreign currency exchange contracts	OMAM funds net gains (losses):			0.1			—			—			(4.9	)		0.4		—
	Interest rate contracts	OMAM funds net gains (losses):			0.4			—			—			—			—		—
	Futures contracts	OMAM funds net gains (losses):			—			—			0.4			—			—		—
	Other derivatives	OMAM funds net gains (losses):			—			—			0.6			—			—		—
	Total			$	0.6		$	(0.7	)	$	2.6		$	(6.7	)	$	1.3	$	—

Discontinued_Operations_and_Re

Discontinued Operations and Restructuring	12 Months Ended
	Dec. 31, 2014
Discontinued Operations and Restructuring
Discontinued Operations and Restructuring	22) Discontinued Operations and Restructuring
	Discontinued operations
	The Company's gain (loss) from discontinued operations was comprised of the following at December 31 (in millions, except for per share data):
		2014			2013			2012
	Revenues	$	38		$	84.8		$	137.6
	Compensation expense		30.9			50.7			102.1
	Depreciation		0.2			0.5			1.7
	Other operating expenses		9.8			16.2			37.6
	Amortization and impairment of goodwill & intangibles		—			0.1			32.7
	Operating income (loss)		(2.9	)		17.3			(36.5	)
	Investment gain (loss) of consolidated Funds		2.8			(9.4	)		6
	Net interest income (expense)		0.1			—			(0.2	)
	Income (loss) before taxes		0			7.9			(30.7	)
	Income taxes		1.1			5.2			(3.7	)
	Discontinued net income (loss)		(1.1	)		2.7			(27.0	)
	Gain (loss) on disposal, net of tax of $(1.5), $2.3, and $(7.7)		2.3			(2.1	)		10.8
	Total discontinued operations		1.2			0.6			(16.2	)
	Attributable to non-controlling interests		4.7			(5.8	)		4.9
	Attributable to controlling interests	$	(3.5	)	$	6.4		$	(21.1	)
	Pro forma earnings (loss) per share (basic and diluted) attributable to controlling interests	$	(0.03	)	$	0.05		$	(0.18	)
	In the second quarter of 2014, the Company transferred the operations of Rogge Global Partners plc to the Company's Parent and has accordingly presented its results within discontinued operations for historical periods.
	During 2013, the Company committed to a plan to wind up the operations of Echo Point Investment Management, and has accordingly presented its results within discontinued operations for historical periods. The Company recorded a liability for incremental costs expected to be incurred, and recognized a loss in relation to the excess of carrying amount over recoverable amount of the net assets of the business. The shutdown process was completed during the first quarter of 2014.
	During 2012, the Company sold its interest in Dwight Asset Management to Goldman Sachs Asset Management, and completed management buy-out transactions with the key employees of Analytic Investors, Ashfield Capital Partners, Larch Lane Advisors, 300 North Capital and 2100 Xenon. The Company also sold its advisory mandates on several Old Mutual Capital mutual funds to Touchstone Investments during 2012, subsequently shutting down the Old Mutual Capital business. At the date the assets attributable to these discontinued operations became held for sale, their carrying amount was assessed for impairment by comparison to their fair value, less costs to sell. This assessment resulted in the recognition of an impairment charge of $25.2 million. The sale proceeds recognized from these transactions, in addition to contingent earn-out revenue from disposals completed in prior periods, net of disposal costs incurred and post-closing funding commitments exceeded the fair value of assets and liabilities disposed of at closing by $18.5 million, resulting in a net gain on disposal.
	Restructuring costs
	During 2012, the Company commenced the process of closing its corporate trustee entity, Old Mutual Asset Management Trust Company, and moving to an outsourced provider for its ongoing corporate trustee activities. This decision was taken so as to more efficiently support the Company's private fund and collective vehicle offerings in the future. As a result, severance costs of $0.3 million were incurred during 2012, which have been included within compensation and benefits in the Consolidated Statement of Operations.
	Liabilities associated with discontinued operations and restructuring are summarized as follows as of December 31 (in millions):
		2014			2013
	Beginning balance at January 1	$	8.6		$	11.1
	Abandoned lease liability principle payments		(0.4	)		(0.7	)
	Accrual of wind-up costs in relation to discontinued operation		0.3			2.8
	Payment of wind-up costs in relation to discontinued operation		(2.6	)		(0.2	)
	Adjustment to sub-lease arrangement on abandoned lease		1.2			0.6
	Drawdowns on committed funding		(1.5	)		(5.0	)
	Ending balance at December 31	$	5.6		$	8.6
	No additional costs are expected to be incurred in connection with discontinued operations or restructuring for the events described above.

Segment_Information

Segment Information	12 Months Ended
	Dec. 31, 2014
Segment Information
Segment Information	23) Segment Information
	The Company operates one business segment that provides investment management services and products to predominantly institutional clients. The primary measure used by the CODM in measuring performance and allocating resources is Economic Net Income ("ENI").
	The Company uses ENI to make resource allocation decisions, determine appropriate levels of investment or dividend payout, manage balance sheet leverage, determine Affiliate variable compensation and equity distributions, and incentivize management. These ENI adjustments include both reclassifications of U.S. GAAP revenue and expense items, as well as adjustments to U.S. GAAP results, primarily to exclude non-cash, non-economic expenses, or to reflect cash benefits not recognized under U.S. GAAP. Adjustments in the calculation of ENI made to U.S. GAAP results include, but are not limited to, the following:
	The Company re-categorizes certain line items on the income statement to reflect the following:
	•	It excludes the effect of Fund consolidation by removing the portion of Fund revenues, expenses and investment return which is not attributable to our shareholders;
	•	It includes within management fee revenue any fees paid to Affiliates by consolidated Funds, which are viewed as investment income under U.S. GAAP;
	•	It includes the Company's share of earnings from equity-accounted Affiliates within other income, rather than investment income;
	•	It treats sales-based compensation as a general and administrative expense, rather than part of fixed compensation and benefits;
	•	It identifies separately, the fixed and variable components of compensation and benefits expense; and
	•	It identifies separately as Affiliate distributions the component of U.S. GAAP compensation that represents earnings shared with Affiliate key employee equity and profit-interest holders.
	The Company has made the following adjustments to reflect the Reorganization which took place at the time of the Offering:
	i.	It excludes notional corporate cost allocations which are non-cash expenses that no longer recur following the Offering.
	ii.	It excludes interest expense historically paid to the Parent, as the related debt was restructured in connection with the Offering and the intercompany interest will be eliminated from the consolidated results of the Company going forward.
	iii.	It excludes historic mark-to-market co-investment gains and losses, because these investments and ongoing returns thereon have been allocated to our Parent in connection with the Offering.
	iv.	It excludes costs related to the Company's initial preparations for an initial public offering which were expensed in prior periods.
	The Company also makes the following adjustments to U.S. GAAP results to more closely reflect the economic results of the Company:
	v.	The Company excludes non-cash expenses representing changes in the value of Affiliate equity and profit-interests held by Affiliate key employees. These interests may in certain circumstances be repurchased by OMAM at a value based on a pre-determined fixed multiple of trailing earnings and as such this value is carried on the Company's balance sheet as a liability. Non-cash movements in the value of this liability are treated as compensation expense under U.S. GAAP. However, any equity or profit-interests repurchased by OMAM can be used to fund a portion of future variable compensation awards, resulting in savings in cash variable compensation that offset the negative cash effect of repurchasing the equity. The Company's Affiliate equity and profit-interest plans have been designed to ensure OMAM is never required to repurchase more equity than the Company can reasonably recycle through variable compensation awards in any given twelve month period. OMAM may also choose to retain repurchased Affiliate equity or profit-interests, entitling it to an additional share of future Affiliate earnings that represents an unrecognized economic asset to the Company. The value of this unrecognized asset offsets the value of the U.S. GAAP liability.
	vi.	The Company excludes non-cash amortization or impairment expenses related to acquired goodwill and other intangibles as these are non-cash charges that do not result in an outflow of tangible economic benefits from the business.
	vii.	The Company excludes the results of discontinued operations attributable to controlling interests since they are not part of the Company's ongoing business, and restructuring costs incurred in continuing operations which represent an exit from a distinct product or line of business.
	viii.	The Company excludes deferred tax resulting from changes in tax law and expiration of statutes, adjustments for uncertain tax positions, deferred tax attributable to intangible assets and other unusual items not related to current operating results to reflect ENI tax normalization.
	The Company also adjusts its income tax expense to reflect any tax impact of its ENI adjustments.
	Economic Net Income is comprised of the following for each of the years ended December 31 (in millions):
			2014			2013			2012
	Management fees		$	589.9		$	499.8		$	420.9
	Performance fees			34.3			18.1			14.1
	Other income, including equity-accounted subsidiaries			11.2			9.6			15.8
	Total ENI Revenue			635.4			527.5			450.8
	Fixed compensation & benefits			120.2			111.4			104
	General and administrative expenses			94.6			76.5			71.1
	Depreciation and amortization			6.1			4.9			5.7
	Total ENI Operating expenses			220.9			192.8			180.8
	Earnings before variable compensation			414.5			334.7			270
	Variable compensation			169.8			153.8			121
	Earnings after variable compensation			244.7			180.9			149
	Affiliate key employee distributions			40.1			28.4			19.1
	Earnings after Affiliate key employee distributions			204.6			152.5			129.9
	Net interest income			(0.5	)		0.5			1.4
	Pre-tax economic net income			204.1			153			131.3
	Tax on economic net income			52.8			30.1			19
	Economic net income		$	151.3		$	122.9		$	112.3
	ENI operating margin before Affiliate key employee distributions*			39	%		34	%		33	%
	ENI operating margin after Affiliate key employee distributions**			32	%		29	%		29	%
	*	ENI operating margin before Affiliate key employee distributions is calculated based on earnings after variable compensation divided by ENI Revenue.
	**	ENI operating margin after Affiliate key employee distributions is calculated based on earnings after key employee distributions divided by ENI Revenue.
	The following table reconciles Economic Net Income to U.S. GAAP net income (loss) attributable to controlling interests for the years ended December 31 (in millions):
					2014			2013			2012
	GAAP net income (loss) attributable to controlling interests				$	51.7		$	25.7		$	3
	Adjustments related to restructuring and reorganization actions undertaken in connection with this offering:
	i		Non-cash notional parent corporate cost allocation			3.4			3.3			2.8
	ii		Intercompany interest expense			49.8			72.2			84
	iii		Co-investment (gain)			(2.6	)		(3.0	)		(1.2	)
	iv		Initial public offering costs			—			—			0.4
	Adjustments to reflect the economic earnings of our Company:
	v		Non-cash key employee-owned equity and profit-interest revaluations(1)			83			47.7			16.2
	vi		Amortization and impairment of goodwill and acquired intangible assets			0.1			0.1			1.8
	vii		Discontinued operations attributable to controlling interests and Restructuring			5.8			(6.3	)		21
	viii		ENI tax normalization			(6.7	)		1.2			(9.0	)
	Tax effect of above adjustments					(33.2	)		(18.0	)		(6.7	)
	Economic net income after taxes				$	151.3		$	122.9		$	112.3
	-1	2014 amount includes $31.6 million related to the purchase of additional ownership interests in an Affiliate. Please see the Company's Prospectus for additional information regarding this transaction which was completed on October 9, 2014.
	Other segmental information is provided as follows for the years ended December 31, (in millions):
			2014			2013			2012
	Revenue included within economic net income(1)		$	635.4		$	527.5		$	450.8
	Exclude investment return on equity-accounted affiliates			(9.6	)		(7.7	)		(15.3	)
Additional Revenue from consolidated Funds			430.5			408.8			268
U.S. GAAP Revenue		$	1,056.30		$	928.6		$	703.5
-1	Sourced entirely from operations in the United States
		2014			2013
Total assets domiciled in the United Kingdom		$	—		$	51.8
Total assets domiciled in the United States			993.2			962.6
Total assets, excluding impact of consolidated Funds		$	993.2		$	1,014.4

Selected_Quarterly_Financial_D

Selected Quarterly Financial Data	12 Months Ended
	Dec. 31, 2014
Selected Quarterly Financial Data
Selected Quarterly Financial Data
	24) Selected Quarterly Financial Data
	The following is a summary of the quarterly results of operations of the Company for the years ended December 31, ($ in millions, unless otherwise noted):
			2014
			First Quarter			Second Quarter			Third Quarter			Fourth Quarter
	Revenue		$	269.4		$	260.4		$	260		$	266.5
	Operating income (loss)			5.6			(45.5	)		(18.2	)		(9.1	)
	Income (loss) from continuing operations before income taxes			8.4			(44.1	)		(15.7	)		19.2
	Net income (loss)			4.1			(55.6	)		(8.4	)		16.1
	Net income (loss) attributable to controlling interests			10.3			8.8			(1.7	)		34.3
	Basic and fully diluted earnings per share ($)		$	0.08		$	0.08		$	(0.01	)	$	0.28
	Basic and fully diluted shares outstanding (in millions)*			120			120			120			120
			2013
			First Quarter			Second Quarter			Third Quarter			Fourth Quarter
	Revenue		$	223.6		$	247		$	209.7		$	248.3
	Operating loss			(13.8	)		(51.4	)		(5.2	)		(29.1	)
	Loss from continuing operations before income taxes			(11.6	)		(56.2	)		(2.2	)		(13.8	)
	Net loss			(11.3	)		(70.0	)		(5.1	)		(10.1	)
	Net income attributable to controlling interests			6.2			5.5			6.9			7.1
	Basic and fully diluted earnings per share ($)		$	0.05		$	0.04		$	0.06		$	0.06
	Basic and fully diluted shares outstanding (in millions)*			120			120			120			120
	*	Reflects pro forma shares outstanding in prior periods

Basis_of_Presentation_and_Sign1

Basis of Presentation and Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Basis of Presentation and Significant Accounting Policies
Basis of presentation	Basis of presentation
	These Consolidated Financial Statements reflect the historical balance sheets; statements of operations and of comprehensive income; statements of changes in shareholders' equity; and statements of cash flows of the Company. On October 15, 2014, the Company completed the Offering by its Parent of 22,000,000 ordinary shares of the Company pursuant to the Securities Act of 1933, as amended. Additionally, the underwriters in the Offering exercised a portion of their overallotment option and purchased an additional 2,231,375 shares of the Company from the Parent. Within these Consolidated Financial Statements, entities that are part of the Parent's consolidated results, but are not part of OMAM, as defined above, are referred to as "related parties." These historical Consolidated Financial Statements prepared prior to the Offering use the Parent's historical basis in determining the assets and liabilities and the results of the Company. The financial information included herein may not reflect the consolidated financial position, operating results, changes in the Parent's equity investment and cash flows of the Company in the future, and does not reflect what they would have been had the Company been a separate, stand-alone entity for the entirety of the periods presented.
	The Company historically has utilized the services of the Parent for certain functions. These services include providing working capital, as well as certain finance, internal audit, insurance, human resources, investor relations, risk, governance and other corporate functions and projects. The cost of these services has been allocated to the Company and included in the Consolidated Financial Statements. The allocations have been determined on the basis which the Parent and the Company considered to be reasonable reflections of the utilization of services provided by the Parent. Subsequent to the Offering, the Company assumed responsibility for the costs of these functions.
	The Consolidated Financial Statements are prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP"). All dollar amounts, except per share data in the text and tables herein, are stated in millions unless otherwise indicated. Transactions between the Company and the Parent are included in the Consolidated Financial Statements, however material intercompany balances and transactions among the Company, its consolidated Affiliates and consolidated Funds are eliminated in consolidation.
Allocated Costs from the Parent	Allocated Costs from the Parent
	The Company's Parent provides the Company with various services, including governance through the board of directors and executive committees, investor relations, procurement of insurance coverage, human resources, financial reporting, internal audit, treasury, systems, risk and tax services. Some of these services are directly attributable to the Company and some are of a more general nature. The costs associated with the services which are (i) directly attributable to the Company, (ii) have been charged directly to the Company by the Company's Parent, and (iii) have been paid to the Company's Parent by the Company have been reflected in the Company's Consolidated Financial Statements. During the years ended December 31, 2014, 2013 and 2012, the amount of expenses charged directly to the Company from the Company's Parent were $2.1 million, $2.0 million and $2.7 million, respectively.
	With respect to the above services and benefits which are not directly attributable to the Company, costs were allocated to the Company and included in the Consolidated Financial Statements, based generally on the Company's proportion of the total Parent's consolidated, normalized revenues. During the years ended December 31, 2014, 2013 and 2012, costs allocated to the Company from Parent were $3.4 million, $3.3 million and $2.8 million, respectively. Subsequent to the Offering, these general costs are no longer allocated and if required are borne directly by the Company.
	These cost allocations were determined using a method that Parent and the Company considered reasonably reflected the costs of such services attributable to the Company provided by Parent. The Company believes the assumptions and allocations underlying the Consolidated Financial Statements are reasonable and the allocated amounts are representative of the amounts that would have been recorded in the Consolidated Financial Statements had the Company operated independent of Parent for the historical periods presented prior to the Offering. A more detailed discussion of the relationship with Parent, including a description of the costs that have been allocated to the Company, as well as the allocation methods, is included in Note 10, "Related Party Transactions".
Consolidation	Consolidation
	Affiliates
	The Company evaluates each of its Affiliate and other operating entities to determine the appropriate method of accounting. Generally, majority-owned entities or otherwise controlled investments in which the Company holds a controlling financial interest as the principal shareholder, managing member, or general partner are consolidated.
	Funds
	In the normal course of business, the Company's Affiliates sponsor and manage certain investment vehicles (the "Funds"). The Company assesses consolidation requirements with respect to its Funds pursuant to Accounting Standards Codification ("ASC") Topic 810 relating to the consolidation of variable interest entities. Substantially all of the Funds that are managed by the Company qualify for the deferral granted under Accounting Standards Updates ("ASU") 2010-10, "Amendments for Certain Investment Funds" ("ASU 2010-10"). As such, the Company evaluates these Funds for consolidation pursuant to guidance formerly in Financial Accounting Standards Board ("FASB") Interpretation No. 46(R), Consolidation of Variable Interest Entities. These Funds are typically owned entirely by third-party investors, however certain Funds are capitalized with seed capital investments from the Company or its related parties and may be owned partially by Affiliate key employees and/or individuals that own minority interests in an Affiliate.
	In evaluating whether or not a legal entity must be consolidated, the Company determines if such entity is a variable interest entity ("VIE") or a voting interest entity ("VOE"). A VOE is considered an entity in which (i) the total equity investment at risk is sufficient to enable the entity to finance its activities independently and (ii) the equity holders at risk have the obligation to absorb losses, the right to receive residual returns, and the right to direct the activities of the entity that most significantly impact the entity's economic performance. A VIE is an entity that lacks one or more of the characteristics of a VOE. Assessing whether an entity is a VIE or VOE involves judgment and analysis. Factors considered in this assessment include the entity's legal organization, the entity's capital structure and equity ownership and any related party or de facto agent implications of the Company's involvement with the entity. Investments that are determined to be VIEs are consolidated if the Company or a consolidated Affiliate is the primary beneficiary of the investment. VOEs are typically consolidated if the Company holds the majority voting interest or otherwise controls the entity.
	In evaluating whether the Company is the primary beneficiary, the Company evaluates its economic interests in the entity held either directly by the Company or indirectly through related parties. For VIEs that are investment companies subject to ASU 2010-10, the primary beneficiary of the VIE is generally the variable interest holder that absorbs a majority of the expected losses of the VIE, receives a majority of the expected residual returns of the VIE, or both. The Company generally is not the primary beneficiary of Fund VIEs created to manage assets for clients unless the Company's ownership interest, including interests of related parties, is substantial.
	For VIEs that do not qualify for the deferral granted under ASU 2010-10, the primary beneficiary of a VIE is defined as the variable interest holder that has a controlling financial interest. A controlling financial interest is defined as (i) the power to direct the activities of the VIE that most significantly impacts its economic performance and (ii) the obligation to absorb losses of the entity or the right to receive benefits from the entity that could potentially be significant to the VIE. If no single party satisfies both criteria, but the Company and its related parties satisfy the criteria on a combined basis, then the primary beneficiary is the entity out of the related party group that is most closely associated to the VIE. The consolidation analysis can generally be performed qualitatively, however, if it is not readily apparent that the Company is not the primary beneficiary, a quantitative analysis may also be performed.
	The Company consolidates VOEs when it has control over significant operating, financial and investing decisions of the entity. For VOEs organized as limited partnerships or as an entity with governance structures similar to a limited partnership (e.g., limited liability company with a managing member), the Company consolidates an entity when it holds the controlling general partnership interest and the limited partners do not hold substantive participating rights or rights to remove and replace the general partner or rights that could provide the limited partners with the ability to impact the ongoing governance and operating activities of the entity.
	Other than Funds holding investments in timber assets (the "Timber Funds"), the Company's consolidated Funds are investment companies (the "Investment Funds") and the Company has therefore retained their specialized investment company accounting in consolidation, pursuant to ASC 946, "Financial Services—Investment Companies."
	Upon the occurrence of certain events (such as contributions and redemptions, either by the Company, its Affiliates, or third parties, or amendments to the governing documents of the Company's investees or sponsored Funds) management reviews and reconsiders its previous conclusion regarding the status of an entity as a VIE or a VOE. Additionally, management continually reconsiders whether the Company is deemed to be a VIE's primary beneficiary who consolidates such entity.
Timber Funds	Timber Funds
	Timber assets and timber lease rights of consolidated Timber Funds are stated at historical cost less depletion for timber previously harvested and less accumulated amortization and depreciation for lease rights and roads. The Company performs a valuation of acquired timber property to assess the allocation of purchase price for each material asset acquired that is expected to provide a future economic benefit to the Company. Fair value of each asset is determined by using a discounted future cash flow model and applying assumptions commonly used in the industry. The cost of the acquired assets is then allocated pro rata based on the relative fair values. Timber investment values are adjusted for capital additions made to the property subsequent to the valuation date. All initial silviculture costs, including site preparation and planting costs are capitalized as stand establishment costs. Stand establishment costs are transferred to a merchantable timber classification as trees reach a certain size. Generally, costs incurred subsequent to two years after planting, such as fertilization, vegetation, insect control and pre-commercial thinning are considered to be maintenance and are expensed as incurred.
	The Company estimates its timber inventory using statistical information and data obtained from physical measurements, site maps, photo-types and other information gathering techniques. These estimates are updated annually and may result in adjustments of timber volumes, including timber growth rates and depletion rates.
	Depletion consists of costs attributed to harvesting timber and is recorded as an expense as timber is harvested. The depletion rate applied to the volume of timber sold is adjusted annually and is based on the relationship of incurred costs in the merchantable timber classification to estimated current merchantable volume.
	Timber and timberlands are reviewed for impairment when events or changes in circumstances indicate that the carrying value of such assets may not be recoverable. The Company compares the carrying value of a timber asset with the asset's expected future undiscounted cash flows. If the carrying value of the asset exceeds the expected future cash flows, impairment exists, which is measured by the excess of the carrying value over the fair value of the assets. The Company recognized no timber impairment losses for the years ended December 31, 2014, 2013 and 2012.
Use of estimates	Use of estimates
	The preparation of these Consolidated Financial Statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the period. Actual results could differ significantly from those estimates.
Operating segment	Operating segment
	The Company operates in one operating segment that provides investment management services and products primarily to institutional clients. Although the Company does make certain disclosures regarding assets under management by product and affiliate, the Company's determination that it operates one business segment is based on the fact that the Chief Operating Decision Maker ("CODM") reviews the Company's financial performance on an aggregate level.
Cash and cash equivalents
	Cash and cash equivalents
	The Company considers all highly liquid investments, including money market mutual funds, with original maturities of three months or less to be cash equivalents. Cash equivalents are stated at cost, which approximates market value due to the short-term maturity of these investments. Cash held by consolidated Funds is not available to fund general liquidity needs of the Company.
	Restricted cash in Timber Funds consists primarily of deposits in time deposit accounts, earning interest at LIBOR + a margin, which are restricted to payment of certain notes payable of consolidated Funds of the Company (also see Note 13). Restricted cash of the consolidated Timber Funds may only be drawn upon to meet debt service payments (corrective coverage payments) or to pay certain Fund operating expenses through December 31, 2014. During the period thereafter, the restricted reserve balance may only be drawn upon for principal payments.
Fair value measurements	Fair value measurements
	In accordance with the provisions of FASB ASC 820, "Fair Value Measurement" ("ASC 820"), fair value is the price that the Company expects to be paid upon the sale of an asset or expects to pay upon the transfer of a liability in an orderly transaction between market participants. Pursuant to ASC 820, there is a three-level hierarchy for fair value measurements based upon the transparency of inputs to the valuation of an asset or liability. Inputs may be observable or unobservable and refer broadly to the assumptions that market participants would use in pricing the asset or liability. Observable inputs reflect the assumptions market participants would use in pricing the asset or liability based on market data obtained from independent sources. Unobservable inputs reflect the Company's own conclusions about the assumptions that market participants would use in pricing the asset or liability based on the best information available in the circumstances. Each investment is assigned a level based upon the observability of the inputs which are significant to the overall valuation. Assets and liabilities measured and reported at fair value are classified and disclosed in one of the following categories:
	•	Level I—Quoted prices are available in active markets for identical investments as of the reporting date. The type of investments included in Level I include listed equities and listed derivatives. As required by U.S. GAAP, the Company does not adjust the quoted price for these investments.
	•	Level II—Pricing inputs are other than quoted prices in active markets, which are either directly or indirectly observable as of the reporting date, and fair value is determined through the use of models or other valuation methodologies utilizing observable market inputs other than quoted prices. Investments which are generally included in this category include corporate bonds and loans, less liquid and restricted equity securities and certain over-the-counter derivatives.
	•	Level III—Pricing inputs are unobservable for the asset or liability and include assets and liabilities where there is little, if any, market activity for the investment. The inputs into the determination of fair value require significant management judgment or estimation. Investments that are included in this category generally include general and limited partner interests in corporate private equity, real estate funds, and funds of hedge funds.
	In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, an investment's level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The Company's assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the investment.
Investments and Investment Transactions
	Investments and Investment Transactions
	Valuation of investments held at fair value
	Valuation of Fund investments is evaluated pursuant to the fair value methodology discussed above. The Company's discretionary investments are categorized as trading and held at estimated fair value. Realized and unrealized gains and losses arising from changes in fair value of discretionary investments are reported within investment income in the Consolidated Statements of Operations. See Note 4 for a summary of the fair value inputs utilized to determine the fair value of other discretionary investments held at fair value.
	Security transactions
	The Investment Funds generally record securities transactions on a trade-date basis. Realized gains and losses on securities transactions are generally determined on the average-cost method (net of foreign capital gain taxes) and for certain transactions determined based on the specific identification method.
	Income and expense recognition
	The Investment Funds record interest income on an accrual basis and include amortization of premiums and accretion of discounts. Dividend income and expense on dividends sold short are recorded on the ex-dividend date, net of applicable withholding taxes. Expenses are recorded on an accrual basis.
	Foreign currency translation
	The books and records of the Company and its Affiliates are maintained in U.S. dollars. Except for one Timber Fund in Australia, the books and records of consolidated Funds are maintained in U.S. dollars. Investment securities and other assets and liabilities denominated in a foreign currency are translated into U.S. dollars on the date of valuation. Income and expense transactions denominated in foreign currencies are translated into U.S. dollars using the average exchange rate over the period presented. The portion of realized or unrealized gains and losses resulting from changes in foreign exchange rates and from fluctuations arising from changes in the market prices of the underlying securities are included in the net realized and unrealized gain and loss on investments on the consolidated statement of operations. Net realized and unrealized gains and losses on foreign currency transactions represent net foreign exchange gains or losses from forward foreign currency exchange contracts, disposition of foreign currencies, currency gains or losses between the trade and settlement date on security transactions, and the difference between the amount of the investment income and foreign withholding taxes recorded on the Funds' books and the U.S. dollar equivalent amounts actually received or paid.
	Short sales
	Certain of the Funds may sell a security they do not own in anticipation of a decline in the fair value of that security. When a Fund sells a security short, it must borrow the security sold short and deliver it to the broker-dealer through which it made the short sale. The short sales are secured by the long portfolio and available cash. The Fund records a gain, limited to the price at which the Fund sold the security short, or a loss, unlimited in size, upon the termination of a short sale. The amount of the gain or loss will be equal to the proceeds received in entering into the short sale less the cost of buying back the short security to close the short position. While the transaction is open, the Fund will incur an expense for any accrued dividends or interest which is paid to the lender of the securities. These short sales may involve a level of risk in excess of the liability recognized in the accompanying consolidated balance sheet. The extent of such risk cannot be quantified.
	Derivatives
	Certain Funds use derivative instruments. However, there is minimal risk to the Company in relation to the derivative assets and liabilities of the Funds in excess of its investment in the respective Funds holding the investment. The Funds' derivative instruments include foreign currency exchange contracts, credit default swaps, interest rate swaps, financial futures contracts and warrants. The fair values of derivative instruments are recorded as other assets or other liabilities on the Company's Consolidated Balance Sheets. The Company has used foreign exchange forwards to hedge the risk of movement in exchange rates on financial assets on a limited basis.
	The Company's Funds have not designated any financial instruments for hedge accounting, as defined in the accounting literature, during the periods presented. The gains or losses on derivative instruments not designated for hedge accounting are included as investment income in the Company's Consolidated Statements of Operations.
Equity method investments	Equity method investments
	The Company uses the equity method of accounting for investments that provide the Company with the ability to exercise significant influence over an entity, but that do not meet the requirements for consolidation. Equity method investments include two Affiliates, Heitman LLC and Investment Counselors of Maryland, LLC as well as all unconsolidated Funds over which the Company exercises significant influence. The Company's share of earnings (losses) from equity method investments is included in investment income in the Consolidated Statements of Operations. The carrying amounts of equity method investments are reflected in Investments in the Consolidated Balance Sheets. The Company evaluates its equity method investments for impairment whenever events or changes in circumstances indicate that the carrying amounts of such investments may not be recoverable. The difference between the carrying value and its estimated fair value is recognized as impairment when the loss is deemed other than temporary. Other investments, in which OMAM or an Affiliate do not exercise significant influence are accounted for under the cost method. Under the cost method, income is recognized as dividends are declared.
Revenue recognition	Revenue recognition
	The Company's consolidated revenue primarily represents management fees billed monthly, quarterly and annually by Affiliates for managing the assets of clients. Asset-based management fees are recognized monthly as services are rendered and are primarily based upon a percentage of the market value of client assets managed. Affiliates that manage tangible property may also earn transaction fees at the time the underlying property is bought and sold. Any fees collected in advance are deferred and recognized as income over the period earned. Dividend income received by Investment Funds is recorded on the ex-dividend date. Performance fees are generally assessed as a percentage of the investment performance realized on a client's account. Performance fees, including those that are subject to clawback are recognized when they (i) become billable to customers (based on contractual terms of agreements), (ii) are not subject to contingent repayment and (iii) when collection is reasonably assured. Other income and revenues include interest income on cash and cash equivalents of Investment Funds and the Company's share of earnings from joint venture partners.
	Timber Funds' revenue is recognized from log and fiber sales upon delivery to the customer. The Company is typically responsible for all logging and hauling costs. However, under pay-as-cut timber contracts, title and risk of loss from stumpage sales transfer to the buyer as the trees are cut. Revenue is recognized as timber is harvested. The buyer is typically responsible for all logging and hauling costs.
Investment advisory fees receivable	Investment advisory fees receivable
	The Company earns management and performance fees which are billed monthly, quarterly and annually in arrears, according to the terms of the relevant investment management agreement. Management and performance fees that have been earned, but have not yet been collected are presented as Investment advisory fees receivable on the Consolidated Balance Sheets. Due to the short-term nature and liquidity of these receivables, the carrying amounts approximate their fair values. The Company's accounts receivable balances do not include any allowance for doubtful accounts, nor has any bad debt expense attributable to accounts receivable been recorded for the years ended December 31, 2014, 2013, and 2012. The Company believes all accounts receivable balances are fully collectible.
Property and equipment	Property and equipment
	Property and equipment are recorded at historical cost and depreciated using the straight-line method over its estimated useful lives. The estimated useful lives of office equipment and furniture and fixtures range from three to five years. Leasehold improvements are amortized over the shorter of their estimated useful lives or the remaining term of the lease. Computer software developed or obtained for internal use is amortized using the straight-line method over the estimated useful life of the software, which is generally three years or less. The costs of improvements that extend the life of a fixed asset are capitalized, while the cost of repairs and maintenance is expensed as incurred.
Intangible assets	Intangible assets
	Acquired Affiliates have identifiable intangible assets arising from contractual or other legal rights with their clients. In determining the value of acquired intangibles, the Company analyzes the net present value of each acquired Affiliate's existing client relationships based on a number of factors. The Company analyzes the Affiliate's historical and potential future operating performance, the Affiliate's historical and potential future rates of attrition among existing clients, the stability and longevity of existing client relationships, the Affiliate's recent and long-term investment performance, the characteristics of the firm's products and investment styles, the stability and depth of the Affiliate's management team and the Affiliate's history and perceived franchise or brand value. The Company's acquired intangible assets are predominately definite-life intangible assets and are generally amortized on a straight line basis over their estimated useful lives, ranging from five to sixteen years, reflecting the expected duration of such relationships. The Company does not hold any indefinite-lived intangible assets other than goodwill.
	The Company tests for the possible impairment of acquired intangibles whenever events or changes in circumstances indicate that the carrying amount of the asset is not recoverable. If such indicators exist, the Company compares the undiscounted cash flows related to the asset to the carrying value of the asset. If the carrying value is greater than the undiscounted cash flow amount, an impairment charge is recorded in the Consolidated Statements of Operations for amounts necessary to reduce the carrying value of the asset to fair value. Intangible assets to be disposed of are reported at the lower of carrying value or fair value less cost to sell.
Goodwill	Goodwill
	The Company records goodwill when the consideration paid in a business acquisition exceeds the fair value of the net total of tangible assets acquired, identifiable intangible assets acquired and liabilities assumed. Goodwill is not amortized, but rather is tested for impairment annually or more frequently if events or circumstances occur that indicate impairment may exist. Factors that could trigger an impairment review include significant underperformance relative to historical or projected future operating results, significant changes in the Company's use of the acquired assets in a business combination or the strategy for the Company's overall business, and significant negative industry or economic trends.
	The Company performs its assessment for impairment of goodwill during the fourth quarter annually as of September 30, or as necessary, and the Company has determined that it has five reporting units, consisting of the five consolidated Affiliates. The Company first considers various qualitative factors to determine if it is more likely than not that the fair value of each of the reporting units is greater than its respective carrying amount, including goodwill. If the fair value of any reporting unit declines below its respective carrying amount, therefore indicating that impairment may exist, the impact would be determined at that point. For purposes of assessing potential impairment, the fair value of the reporting unit is estimated and compared to the carrying value of the reporting unit. The fair value of a reporting unit is based on discounted estimated future cash flows. The assumptions used to estimate fair value include management's estimates of future growth rates, operating cash flows, discount rates and terminal value. These assumptions and estimates can change in future periods based on market movement and factors impacting the expected business performance. Changes in assumptions or estimates could materially affect the determination of the fair value of a reporting unit. If it is determined that the carrying value of the reporting unit exceeds its fair value, the Company determines the implied fair value of the goodwill in the same manner used to determine the amount of goodwill in a business combination. If the carrying value of goodwill exceeds the implied fair value of the goodwill, an impairment charge is recognized in the amount equal to that excess. Based on the Company's most recent annual goodwill impairment test, the fair value of all its reporting units were in excess of their carrying value.
Leases	Leases
	The Company and its Affiliates currently lease office space and equipment under various leasing arrangements, classified as operating leases. As these leases expire, it can be expected that in the normal course of business they will be renewed or replaced. Some lease agreements contain renewal options, rent escalation clauses or other inducements provided by the landlord. Rent expense is accrued to recognize lease escalation provisions and inducements provided by the landlord, if any, on a straight-line basis over the lease term.
Earnings per share	Earnings per share
	The Company calculates basic and diluted earnings per share ("EPS") by dividing net income for the year ended December 31, 2014 by its shares outstanding as outlined below. For periods prior to the Offering (described in Note 1), the Company is calculating pro forma basic and fully diluted EPS based upon 120 million pro forma shares, the number of shares outstanding following the Reorganization described in Note 1.
	Basic EPS attributable to the Company's common shareholders is calculated by dividing "Net income attributable to controlling interests" by the weighted-average number of shares outstanding. Diluted EPS is similar to basic EPS, but adjusts for the effect of potential common shares unless they are antidilutive. For periods with a net loss, potential common shares are considered antidilutive.
	The Company considers two ways to measure dilution to earnings per share: (a) calculate the net number of shares that would be issued assuming any related proceeds are used to buy back outstanding shares (the treasury stock method), or (b) assume the gross number of shares are issued and calculate any related effects on net income available for shareholders (the if-converted or two-class method). As appropriate, the Company's policy is to apply the more dilutive methodology upon issuance of such instruments.
Compensation arrangements	Compensation arrangements
	The Company operates short term variable compensation arrangements where generally, a percentage of each Affiliate's annual pre-variable compensation earnings, as defined in each arrangement, is allocated to a "pool" of each respective Affiliate's key employees, and subsequently distributed to individuals subject to recommendation and approval of a Remuneration Committee comprised of both the Company's and each respective Affiliate's management. Variable compensation expense is accrued and recognized in the Consolidated Statements of Operations as services are provided by individual employees. Variable compensation allocated to the "pools" of Affiliate key employees under the terms of the plans, where distribution has not yet been approved by the Remuneration Committee, is not recognized until the required service has been performed and the award is communicated to the individual.
	The Company operates longer term profit-interest plans whereby certain Affiliate key employees are granted (or have a right to purchase) awards representing a profits interest in their respective Affiliate, as distinct from an equity interest due to the lack of pari passu voting rights. Under these plans, the Company may award a portion of the aforementioned variable compensation arrangement through issuance of a profits interest in the Affiliate. The awards generally have a three to five year vesting period from the grant date, and the service period begins at the commencement of the financial period to which the variable compensation relates. Under these plans, Affiliate key employees are eligible to share in the profits of their respective affiliates based on their respective percentage interest held.
	In addition, under certain circumstances Affiliate key employees are eligible to receive a series of repurchase payments upon exiting the plans based on a multiple of the last twelve months profits of their respective Affiliate, as defined. Profits allocated and movements in the potential repurchase value, determined based on a fixed multiple times trailing twelve month profits, as defined, are recognized as compensation expense. Profits interests compensation liabilities are re-measured at each reporting date at the current trailing twelve month earnings multiple, with movements treated as compensation expense in the Company's Consolidated Statements of Operations.
Share-based compensation plans	Share-based compensation plans
	The Company recognizes the cost of all share-based payments to directors, senior management and employees, including grants of restricted stock and stock options of its Parent and its Affiliates, as compensation expense in the Consolidated Statements of Operations over the respective vesting periods.
	Awards made previously under the Parent's restricted stock and stock options plans are accounted for as equity settled, and the grant date fair value is recognized as compensation expense over the requisite service period, with a corresponding contribution to capital recorded. Options granted are measured at fair value using a standard option pricing valuation model. The valuation is consistent with generally accepted valuation methodologies for pricing financial instruments and incorporates all factors and assumptions that knowledgeable, willing market participants would consider in setting the price of the options.
	In connection with the Offering, certain unvested restricted shares of the Parent were exchanged for unvested restricted shares of the Company. Awards made under the Company's equity plan are accounted for as equity settled, and the grant date fair value is recognized as compensation expense over the requisite service period, with a corresponding contribution to capital recorded.
	Awards of equity made to Affiliate key employees are accounted for as cash settled, with the fair value recognized as compensation expense over the requisite service period, with a corresponding liability carried within other long term liabilities on the Consolidated Balance Sheet until the award is settled by the Company. The fair value of the liability is based on the expected cash to be paid, as determined according to trailing twelve months earnings multiples prescribed by each arrangement. The liability is revalued at each reporting period, with any movements recorded within compensation expense.
Deferred financing costs	Deferred financing costs
	The Company capitalizes certain legal, accounting and other third-party fees that are directly associated with in-process equity financings as other assets until such financings are consummated. After consummation of the equity financing, these costs are recorded in total equity as a reduction of Shareholders' equity generated as a result of the offering. At the time in which the equity financing is no longer considered probable of being consummated, the deferred financing costs are expensed immediately as a charge to operating expenses in the Consolidated Statement of Operations. Costs associated with an unconsummated transaction amounted to $0.0 million, $0.0 million, and $0.4 million expensed in the years ended December 31, 2014, 2013 and 2012, respectively.
Income taxes	Income taxes
	The Company uses the asset and liability method of accounting for income taxes on a "separate return" basis. Under this method, a subsidiary is assumed to file a separate return with the taxing authority, thereby reporting its taxable income or loss and paying the applicable tax to or receiving the appropriate refund from the parent. The rules followed by the subsidiary in computing its tax or refund should be the same as those followed by a taxpayer filing directly with the taxing authority.
	The Company files tax returns directly with the U.S. and state tax authorities and therefore, the computations under the separate return method follow the Company's filings.
	Deferred income taxes are recognized for the effects of temporary differences between the tax basis of an asset or liability and its reported amount in the Consolidated Financial Statements. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date. The Company's deferred tax assets have been attributable to federal and state loss carry forwards, interest deductions, and accrued liabilities. Deferred tax liabilities have been attributable to undistributed earnings of subsidiaries.
	Deferred income tax assets are subject to a valuation allowance if, in management's opinion, it is not more-likely-than-not that these benefits will be realized. In evaluating the Company's ability to recover its deferred tax assets, the Company considers all available positive and negative evidence including its past operating results, the existence of cumulative earnings or losses in the most recent years and its forecast of future taxable income. In estimating future taxable income, the Company develops assumptions including the amount of future pre-tax operating income and the reversal of temporary differences. These assumptions require significant judgment about the forecasts of future taxable income and are consistent with the plans and estimates the Company is using to manage the underlying businesses.
	A tax benefit should only be recognized if it is more likely than not that the position will be sustained based on its technical merits. The Company recognizes the financial statement benefit of a tax position only after considering the probability that a tax authority would uphold the position in an examination. For tax positions meeting a "more-likely-than-not" threshold, the amount recognized in the financial statements is the largest amount of benefit greater than 50% likely of being sustained. The more-likely-than-not threshold must continue to be met in each reporting period to support continued recognition of the benefit. Unrecognized tax benefits and related interest and penalties, are adjusted periodically to reflect changing facts and circumstances. The Company's accounting policy is to classify interest and related charges as a component of income tax expense.
Non-controlling interests	Non-controlling interests
	Non-controlling interests in Consolidated Funds on the Consolidated Balance Sheets include undistributed income owned by the investors in the respective Funds. At December 31, 2013, the Company had non-controlling interests on the Consolidated Balance Sheets of $0.1 million representing equity arrangements for entities that are consolidated, but less than 100% owned. All non-controlling interests in these entities were acquired by the Company in 2014. The Company's consolidated net income on the Consolidated Statements of Operations includes the income (loss) attributable to non-controlling interest holders of these consolidated entities. Ownership interests held by Affiliate key employees are categorized as liabilities on the Consolidated Balance Sheets and are revalued each reporting date, with movements treated as compensation expense in the Consolidated Statements of Operations.
Redeemable non-controlling interests	Redeemable non-controlling interests
	The Company includes redeemable non-controlling interests related to certain consolidated Funds as temporary equity on the Consolidated Balance Sheets. Non-controlling interests in certain consolidated Funds are subject to monthly or quarterly redemption by the investors. When redeemable amounts become legally payable to investors, they are classified as a liability and included in other liabilities of consolidated Funds on the Consolidated Balance Sheets.
Other comprehensive income (loss)	Other comprehensive income (loss)
	Other comprehensive income (loss) is defined as the change in equity of a business enterprise during a period from transactions and other events and circumstances, excluding those resulting from investments by and distributions to owners. For the Company's purposes, comprehensive income (loss) represents net income/loss, as presented in the accompanying Consolidated Statements of Operations, adjusted for net foreign currency translation adjustments.
Restructuring costs	Restructuring costs
	A liability for restructuring is recognized only after management has developed a formal plan, approved by the Board of Directors, to which it has committed. The costs included in a restructuring liability are those costs that are either incremental or incurred as a direct result of the plan, or are the result of a continuing contractual obligation with no continuing economic benefit to the Company, or a penalty incurred to cancel the contractual obligation. Refer to Note 22 for details of the Company's restructuring activities.
Recent accounting developments	Recent accounting developments
	In April 2014, the FASB issued ASU 2014-08, Presentation of Financial Statements and Property Plant and Equipment: Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. ASU 2014-08 amends the criteria for reporting a component of an entity as discontinued operations. The new guidance only allows disposals of components of an entity that represent a strategic shift or will have a major effect on operations to be classified as discontinued operations. Additionally, the guidance allows for an entity to have significant continuing involvement in the operations of a component after the disposal transaction. The new guidance is effective for interim and fiscal periods beginning on or after December 15, 2014. The Company has elected not to early adopt ASU 2014-08. The Company is evaluating the impact of ASU 2014-08, however it does not expect it to have a significant impact on its Consolidated Financial Statements.
	In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers. ASU 2014-09 modifies existing U.S. GAAP revenue recognition standards to more closely align with international accounting standards. Additionally, the guidance requires improved disclosures around the nature, amount, timing and uncertainty of revenue recognized. This new guidance will be effective for annual reporting periods beginning after December 15, 2016 and early adoption is not permitted. The Company is evaluating the impact of ASU 2014-09, however it does not expect it to have a significant impact on its Consolidated Financial Statements.
	In June 2014, the FASB issued ASU 2014-12, Compensation—Stock Compensation: Accounting for Share-Based Payments when the Terms of an Award Provide That a Performance Target Could Be Achieved after the Required Service Period. ASU 2014-12 requires that if an entity were to make a share-based payment award which includes terms that provide for a performance target that affects vesting, the entity must be treated as a performance condition. The new guidance is effective for interim and annual periods beginning after December 15, 2015. Early adoption is permitted and entities may elect to apply this ASU either prospectively for all awards or retrospectively for all awards with outstanding performance targets. The Company has not elected to early adopt ASU 2014-12. The Company is evaluating the impact of ASU 2014-12, however it does not expect it to have a significant impact on its Consolidated Financial Statements.
	In November 2014, the FASB issued ASU 2014-16, Derivatives and Hedging: Determining Whether the Host Contract in a Hybrid Financial Instrument Issued in the Form of a Share Is More Akin to Debt or Equity. Entities may raise capital by issuing different classes of shares with certain preferences and voting rights, some of which may meet the definition of a derivative. For such instruments, ASU 2014-16 clarifies how an issuer or an investor should be interpreted in determining the nature of all stated and implied terms, while considering all the relevant facts and circumstances. ASU 2014-16 is effective for fiscal years beginning after December 15, 2016 and early adoption is permitted. The Company is evaluating the impact of ASU 2014-16, however it does not expect it to have a significant impact on its Consolidated Financial Statements.
	In November 2014, the FASB issued ASU 2014-17, Business Combinations: Pushdown Accounting. ASU 2014-17 expands existing guidance for determining whether and at what threshold an acquired entity can reflect the acquirer's accounting and reporting basis, known as pushdown accounting. Under ASU 2014-17, an acquired entity may apply pushdown accounting upon occurrence of an event in which the acquirer obtains control. ASU 2014-17 is effective for an acquired entity's financial statements as of November 18, 2014.
	In February 2015, the FASB issued ASU 2015-02, Consolidation: Amendments to the Consolidation Analysis. ASU 2015-02 rescinds the deferral of the consolidation rules under FAS 167, "Amendments to FASB Interpretation No. 46(R)", ("FAS 167") granted under ASU 2010-10, and will require all legal entities to be reevaluated under the revised consolidation model. The revised consolidation model provides updates when evaluating i) limited partnerships and similar entities currently under the voting interest model, ii) decision maker or service provider fees as a variable interest, iii) fee arrangements in the primary beneficiary determination, iv) related parties in the primary beneficiary determination, and v) certain investment funds. The amendments are intended to simplify the current consolidation model and reduce the number of consolidation entities by placing more emphasis on the risk of loss when determining a controlling financial interest. The amended guidance is effective for public entities for interim and annual periods beginning after December 15, 2015. Early adoption, including adoption in an interim period, is permitted. The Company is currently assessing the financial statement impact of the revised consolidation model and intends to early adopt ASU 2015-02 once the evaluation of the impact has been completed.

Investments_Tables

Investments (Tables)	12 Months Ended
	Dec. 31, 2014
Investments
Components of investments at December 31
		2014		2013
	Investments by consolidated Funds in related, unconsolidated master Funds	$	23.6	$	19.8
	Other investments of consolidated Funds attributable to non-controlling interests		37.0		386.4
	Investments of consolidated Funds attributable to non-controlling interests held at fair value		60.6		406.2
	Equity-accounted investments in unconsolidated Funds (Note 6)		34.5		43.1
	Other discretionary investments held at fair value		—		0.7
	Total investments in products held at fair value attributable to controlling interests		34.5		43.8
	Investments related to voluntary deferred compensation plans held at fair value		59.7		51.4
	Total investments held at fair value		154.8		501.4
	Equity-accounted investments in Affiliates (Note 6)		50.5		48.5
	Equity-accounted investments in unconsolidated Funds, at cost (Note 6)		0.5		—
	Investments in joint ventures		2.4		2.9
	Other investments		1.7		1.5
	Total investments per Consolidated Balance Sheet	$	209.9	$	554.3
Investment income including realized gain loss on investments		2014		2013		2012
	Investment return of equity-accounted investments in unconsolidated Funds (Note 6)	$	1.9	$	2.9	$	1.7
	Realized and unrealized gains/losses on other discretionary investments held at fair value		0.7		0.1		—
	Total investment return on OMAM products		2.6		3.0		1.7
	Investment return of equity-accounted investments in Affiliates (Note 6)		9.6		7.7		14.8
	Total investment income per Consolidated Statement of Operations (Note 6)	$	12.2	$	10.7	$	16.5

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Measurements
Summary of the assets and liabilities that are measured at fair value on a recurring basis
			Quoted prices			Significant			Significant		Total value,
			in active			other			unobservable		December 31,
			markets			observable			inputs		2014
			(Level I)			inputs			(Level III)
						(Level II)
	Assets of OMAM and consolidated Funds(1)
	Investments owned, at fair value
	Common and preferred stock		$	24.8		$	—		$	—	$	24.8
	Short-term investment funds			0.1			—			—		0.1
	Fixed income securities			1.1			—			—		1.1
	Collective investment funds			—			32.5			—		32.5
	Other investments			0.3			1.8			—		2.1
	Total investments at fair value			26.3			34.3			—		60.6
	Restricted cash held at fair value			104.5			—			—		104.5
	Consolidated Funds Total			130.8			34.3			—		165.1
	Investment securities(2)			59.7			—			—		59.7
	Investments in unconsolidated Funds(3)			—			—			34.5		34.5
	OMAM Total			59.7			—			34.5		94.2
	Total fair value assets		$	190.5		$	34.3		$	34.5	$	259.3
	Liabilities of consolidated Funds(1)
	Common stock		$	(16.4	)	$	—		$	—	$	(16.4	)
	Total fair value liabilities		$	(16.4	)	$	—		$	—	$	(16.4	)
	The following table summarizes the Company's assets and liabilities that are measured at fair value on a recurring basis at December 31, 2013 (in millions):
			Quoted prices			Significant			Significant		Total value,
			in active			other			unobservable		December 31,
			markets			observable			inputs		2013
			(Level I)			inputs			(Level III)
						(Level II)
	Assets of OMAM and consolidated Funds(1)
	Investments owned, at fair value
	Common and preferred stock		$	52		$	—		$	—	$	52
	Short-term investment funds			8.8			—			—		8.8
	Fixed income securities			—			207			—		207
	Collective investment funds			—			9.1			—		9.1
	Corporate debt			—			54.1			—		54.1
	Other investments			0.9			70.2			—		71.1
	Derivatives			2.8			1.3			—		4.1
	Total investments at fair value			64.5			341.7			—		406.2
	Restricted cash held at fair value			80.5			93.6			—		174.1
	Consolidated Funds Total			145			435.3			—		580.3
	Investment securities(2)			52.1			—			—		52.1
	Investments in unconsolidated Funds(3)			—			—			43.1		43.1
	OMAM Total			52.1			—			43.1		95.2
	Total fair value assets		$	197.1		$	435.3		$	43.1	$	675.5
	Liabilities of consolidated Funds(1)
	Common stock		$	(24.6	)	$	—		$	—	$	(24.6	)
	Forward exchange contracts			(3.4	)		(0.1	)		—		(3.5	)
	Interest rate swaps			—			(0.1	)		—		(0.1	)
	Other derivatives			(0.2	)		(0.4	)		—		(0.6	)
	Total fair value liabilities		$	(28.2	)	$	(0.6	)	$	—	$	(28.8	)
	-1	Assets and liabilities measured at fair value are comprised of financial investments managed by the Company's Affiliates. $60.6 million in assets and $16.4 million in liabilities at December 31, 2014 and $406.2 million in assets and $28.8 million in liabilities at December 31, 2013 are the result of the consolidation of Funds sponsored by the Company's Affiliates.
		Of these, collective investment funds are multi-strategy products categorized as Level II because they are redeemable monthly and valued at net asset value per share of the fund without adjustment which the Company believes represents the fair value of the investments. The fair value of fixed income securities, corporate debt, and other investments is estimated based on quoted market prices, dealer quotations or alternative pricing sources supported by observable inputs and therefore classified within Level II. The Company obtains prices from independent pricing services that may utilize broker quotes, but generally the independent pricing services will use various other pricing techniques which take into account appropriate factors such as yield, quality, coupon rate, maturity, type of issue, trading characteristics and other data. The Company has not made adjustments to the prices provided. If the pricing services are only able to (a) obtain a single broker quote or (b) utilize a pricing model, such securities are classified as Level III. If the pricing services are unable to provide prices, the Company attempts to obtain one or more broker quotes directly from a dealer or values such securities at the last bid price obtained. In either case, such securities are classified as Level III. The Company performs due diligence procedures over third party pricing vendors to understand their methodology and controls to support their use in the valuation process to ensure compliance with required accounting disclosures.
		Equity, short-term investment funds and derivatives which are traded on a national securities exchange are stated at the last reported sales price on the day of valuation. To the extent these securities are actively traded and valuation adjustments are not applied, they are classified as Level I. These securities that trade in markets that are not considered to be active but are valued based on quoted market prices, dealer quotations or alternative pricing sources supported by observable inputs obtained by the Company from independent pricing services are classified as Level II.
	-2	Investment securities of $59.7 million and $52.1 million at December 31, 2014 and 2013, respectively, are investments in publicly registered daily redeemable funds (some managed by Affiliates), which the Company has classified as trading securities and valued using the published price as of the measurement dates. Accordingly, the Company has classified these investments as Level I.
	-3	The $34.5 million and $43.1 million at December 31, 2014 and December 31, 2013, respectively, relate to investments in unconsolidated Funds which consist primarily of investments in Funds advised by Affiliates and are valued using NAV which the Company relies on to determine their fair value. The NAVs that have been provided by investees have been derived from the fair values of the underlying investments as of the measurement dates. The Company has classified investments in unconsolidated Funds as Level III given the nature of redemption restrictions that are in place. These unconsolidated Funds consist primarily of real estate investments funds. These investments are subject to longer than monthly or quarterly redemption restrictions, and due to their nature, distributions are received only as cash flows are generated from underlying assets over the life of the Funds. The range of time over which the underlying assets are expected to be liquidated by the investees is approximately 1-8 years from December 31, 2014. The valuation process for the underlying real estate investments held by the real estate investments Funds begins with each property or loan being valued by the investment teams. The valuations are then reviewed and approved by the valuation committee, which consists of senior members of the portfolio management, acquisitions, and research teams. For certain properties and loans, the valuation process may also include a valuation by independent appraisers. In connection with this process, changes in fair-value measurements from period to period are evaluated for reasonableness, considering items such as market rents, capitalization and discount rates, and general economic and market conditions.
Schedule of changes in Level III assets and liabilities			Investments in
			unconsolidated
			OMAM funds
	Balance, December 31, 2012		$	44.5
	Realized gain			7.1
	Net change in unrealized depreciation			(4.2	)
	Purchases, issuances or settlements			0.6
	Dispositions			(4.9	)
	Balance, December 31, 2013		$	43.1
	Realized gain			1.9
	Net change in unrealized depreciation			(5.1	)
	Purchases, issuances or settlements			—
	Dispositions			(5.4	)
	Balance, December 31, 2014		$	34.5

Variable_Interest_Entities_Tab

Variable Interest Entities (Tables)	12 Months Ended
	Dec. 31, 2014
Consolidated VIEs
Variable Interest Entities
Schedule of assets and liabilities and information pertains to VIEs			2014		2013
	Assets
	Investments at fair value		$	5.9	$	90.9
	Restricted cash			2,487.7		2,557.0
	Timber assets			4,053.2		4,172.5
	Other assets of consolidated Funds			165.0		145.0
	Total Assets		$	6,711.8	$	6,965.4
	Liabilities
	Borrowings		$	4,095.9	$	4,146.0
	Other liabilities of consolidated Funds			150.8		77.2
	Total Liabilities		$	4,246.7	$	4,223.2
Unconsolidated VIEs
Variable Interest Entities
Schedule of assets and liabilities and information pertains to VIEs			2014		2013
	Unconsolidated VIE assets		$	9,993.5	$	12,156.8
	Unconsolidated VIE liabilities		$	1,515.0	$	1,720.4
	Equity interests on the Consolidated Balance Sheet		$	75.3	$	78.4
	Maximum risk of loss(1)		$	75.5	$	81.1
	-1	Includes equity investments the Company has made or is required to make and any earned but uncollected management/incentive fees. The Company does not record performance/incentive allocations until the respective measurement period has ended.

Equity_Accounted_Investees_Tab

Equity Accounted Investees (Tables)	12 Months Ended
	Dec. 31, 2014
Equity Accounted Investees
Summary of financial information for Affiliates and Funds accounted for under the equity method
			For the year ended December 31, 2014								For the year ended December 31, 2013
	Statements of Income		Heitman LLC		Other			Total			Heitman LLC		Other			Total
	Net revenues(1)		$	227.4	$	89.1		$	316.5		$	218.3	$	80.1		$	298.4
	Operating income			51		17.2			68.2			49		20.8			69.8
	Other income (expense), net			26.1		(102.1	)		(76.0	)		172.8		(13.4	)		159.4
	Income (loss) before income taxes			77.1		(84.9	)		(7.8	)		221.8		7.4			229.2
	Less income tax expense (benefit)			3		1.9			4.9			1.8		(0.4	)		1.4
	Excluding noncontrolling interests income (loss)			58.6		(89.8	)		(31.2	)		197.2		7.6			204.8
	Net income attributable to controlling interests		$	15.5	$	3		$	18.5		$	22.8	$	0.2		$	23
	OMAM equity in net income of equity method investees		$	8.5	$	3		$	11.5		$	10.4	$	0.2		$	10.6
			For the year ended December 31, 2012
	Statements of Income (cont.)		Heitman LLC		Other			Total
	Net revenues(1)		$	242.3	$	85		$	327.3
	Operating income			72.2		26.6			98.8
	Other income (expense), net			129.3		(66.9	)		62.4
	Income (loss) before income taxes			201.5		(40.3	)		161.2
	Less income tax expense			0.6		—			0.6
	Excluding noncontrolling interests income (loss)			173.6		(42.7	)		130.9
	Net income attributable to controlling interests		$	27.3	$	2.4		$	29.7
	OMAM equity in net income of equity method investees		$	14.1	$	2.4		$	16.5
			As of December 31, 2014								As of December 31, 2013
	Balance Sheets		Heitman LLC		Other			Total			Heitman LLC		Other			Total
	Current assets		$	103.9	$	546.6		$	650.5		$	125.7	$	58.7		$	184.4
	Noncurrent assets			1,543.2		773.3			2,316.5			1,785.4		1,027.4			2,812.8
	Total assets			1,647.1		1,319.9			2,967.0			1,911.1		1,086.1			2,997.2
	Current liabilities			65.8		210.5			276.3			65.9		378.9			444.8
	Long-term liabilities			515.3		342.3			857.6			645.4		48.8			694.2
	Non-controlling interests in subsidiaries			1,014.4		756.9			1,771.3			1,140.2		643.7			1,783.9
	Members' equity		$	51.6	$	10.2		$	61.8		$	59.6	$	14.7		$	74.3
	OMAM equity investment and undistributed earnings of affiliated companies, before consolidating and reconciling adjustments		$	44.7	$	10.2		$	54.9		$	47.1	$	14.7		$	61.8
	Consolidating and reconciling adjustments:
	Goodwill attributable to equity method investment			30.6		—			30.6			29.8		—			29.8
	OMAM investment in equity method investees at cost plus equity in undistributable earnings since acquisition		$	75.3	$	10.2		$	85.5		$	76.9	$	14.7		$	91.6
	-1	Net revenue includes advisory fees for asset management services and investment income, including interest and dividends from consolidated investment partnerships.

Property_and_Equipment_and_Lea1

Property and Equipment and Lease Commitments (Tables)	12 Months Ended
	Dec. 31, 2014
Office space
Property and equipment
Schedule of future minimum lease payments	At December 31, 2014, the Company's aggregate future minimum payments for operating leases having initial or non-cancelable lease terms greater than one year are (in millions):
		Gross			Sub-lease			Net
		minimum			rentals			minimum
		rentals						rentals
	2015	$	11.7		$	(0.2	)	$	11.5
	2016		11			—			11
	2017		10.2			—			10.2
	2018		9.8			—			9.8
	2019		9.5			—			9.5
	Thereafter		22.7			—			22.7
	Total	$	74.9		$	(0.2	)	$	74.7
Timber lease rights
Property and equipment
Schedule of future minimum lease payments	At December 31, 2014, the Company's unrecognized aggregate future minimum payments for timber rights leases having initial or non-cancelable lease terms greater than one year are (in millions):
		Gross			Sub-lease			Net
		minimum			rentals			minimum
		rentals						rentals
	2015	$	1.2		$	—		$	1.2
	2016		1.1			—			1.1
	2017		1.1			—			1.1
	2018		1.0			—			1.0
	2019		1.1			—			1.1
	Thereafter		13.1			—			13.1
	Total	$	18.6		$	—		$	18.6
Consolidated Entity Excluding Consolidated Funds
Property and equipment
Schedule of property and equipment	Property and equipment consisted of the following at December 31 (in millions):
		2014			2013
	Leasehold improvements	$	26.7		$	27.6
	Office equipment		17.5			24.4
	Furniture and fixtures		6.6			8
	Software and web development		14.3			24.9
	Total property and equipment, at cost		65.1			84.9
	Accumulated depreciation and amortization		(41.0	)		(60.8	)
	Property and equipment, net	$	24.1		$	24.1

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure
Schedule of changes in goodwill	The following table presents the changes in goodwill in 2014, and 2013 (in millions):
		Gross			Accumulated			Net Book
		Book Value			Impairment			Value
	Balance at December 31, 2012	$	160.6		$	(42.8	)	$	117.8
	Impairments		—			—			—
	Disposals		—			—			—
	Balance at December 31, 2013	$	160.6		$	(42.8	)	$	117.8
	Impairments		—			—			—
	Additions		11			—			11
	Disposals		(11.2	)		8.9			(2.3	)
	Balance at December 31, 2014	$	160.4		$	(33.9	)	$	126.5
Schedule of change in acquired intangible assets	The following table presents the change in acquired intangible assets in 2014, 2013, and 2012 composed of client relationships (in millions):
		Gross			Accumulated			Net Book
		Book Value			Amortization &			Value
					Impairment
	Balance at December 31, 2012	$	26.8		$	(25.4	)	$	1.4
	Amortization		—			(0.2	)		(0.2	)
	Balance at December 31, 2013	$	26.8		$	(25.6	)	$	1.2
	Amortization		—			(0.1	)		(0.1	)
	Disposals		(4.1	)		4			(0.1	)
	Balance at December 31, 2014	$	22.7		$	(21.7	)	$	1
Schedule of consolidated annual amortization expense	The Company estimates that its consolidated annual amortization expense, assuming no useful life changes or additional investments in new or existing Affiliates, for each of the next five fiscal years is as follows (in millions):
	2015	$	0.1
	2016		0.1
	2017		0.1
	2018		0.1
	2019		0.1
	2020 and thereafter		0.5
	Total	$	1.0

Timber_and_Timberlands_Tables

Timber and Timberlands (Tables) (Consolidated Funds)	12 Months Ended
	Dec. 31, 2014
Consolidated Funds
Timber and timberlands
Schedule of timber and timberlands	Timber and timberlands consisted of the following at December 31 (in millions):
			2014			2013
	Timber		$	2,813.70		$	3,027.70
	Timberlands			1,880.50			1,913.60
	Timber lease rights			198.8			198.8
	Other(1)			27.1			74.7
	Total timber and timberlands, at cost			4,920.10			5,214.80
	Accumulated depletion on timber			(866.0	)		(791.9	)
	Accumulated amortization			(0.9	)		(0.8	)
	Timber and timberlands, net		$	4,053.20		$	4,422.10
	-1	The category "Other" includes buildings, roads, quarries, hunting lease rights and other similar tangible and intangible assets related to timber cutting operations.

Related_Party_Transactions_Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2014
Related Party Transactions
Schedule of related party transactions	Amounts due from related parties were comprised of the following at December 31 (in millions):
			2014		2013
	Interest receivable from Parent(1)		$	—	$	1.8
	Fees receivable from unconsolidated Funds			18.2		26.8
	Fees receivable from commonly controlled Old Mutual plc business units			2.3		2.2
	Receivable from joint venture partners and other			5.3		7.6
	Other amounts due from Parent			1.8		0.1
	Other amounts due from related parties			0.6		0.2
	Total current receivables from related parties			28.2		38.7
	Other long-term amounts due from Parent			—		2.1
	Loan notes receivable from Parent(1)			—		30.1
	Total long-term receivables from related parties			—		32.2
	Total amounts due from related parties		$	28.2	$	70.9
	Amounts due to related parties were comprised of the following at December 31 (in millions):
			2014		2013
	Interest payable to Parent (Note 13)		$	—	$	14.6
	Other amounts due to related parties			0.4		1.0
	Loan notes payable to Parent (Note 13)			37.0		—
	Preferred dividend payable of consolidated Fund			16.3		16.3
	Other amounts due to Parent(2)			3.5		—
	Total current payables to related parties			57.2		31.9
	Revolving credit facility payable to Parent (Note 13)			—		140.7
	Loan notes payable to Parent (Note 13)			—		900.0
	Other amounts due to Parent(2)			286.1		—
	Promissory note payable to related parties of consolidated Fund (Note 13)			318.7		604.7
	Total long-term payables to related parties			604.8		1,645.4
	Total amounts due to related parties		$	662.0	$	1,677.3
	Investments in related parties consisted of the following at December 31 (in millions):
			2014		2013
	Investment in unconsolidated master Funds(3)		$	23.6	$	19.8
	Investments in joint ventures			2.4		2.9
	Investments in equity-accounted investees (Note 6)			85.5		91.6
	Total related party investments		$	111.5	$	114.3
	Related party transactions included in the Company's Consolidated Statement of Operations for the years ended December 31 consisted of (in millions):
			2014		2013		2012
	Management fees collected from commonly controlled Old Mutual business units(3)		$	10.6	$	9.6	$	12.2
	Management fees collected from unconsolidated Funds(1)			47.5		46.4		43.3
	Performance fees collected (performance penalties paid) from (to) unconsolidated Funds(1)			5.9		0.5		(0.2	)
	Management fees collected from joint venture partners			6.4		13.7		11
	Total related party revenues (including discontinued operations)			70.4		70.2		66.3
	Interest expense owed to parent (Note 13)			49.8		72.1		84.1
	Rent and administrative costs recharged by commonly controlled Old Mutual business units(4)			1.2		0.1		1.7
	Restricted stock grants of parent equity to OMAM employees (Note 18)			4.5		5		2.9
	Recharged parent operational costs(5)			5.5		5.3		5.5
	Total related party expenses (including discontinued operations)		$	61	$	82.5	$	94.2
	-1	Transactions with unconsolidated Affiliate-sponsored Funds are considered related party items on the basis of the Company's significant influence over the activities of such entities in its capacity as investment advisor thereto. These transactions are comprised of fees for advisory services and investments in unconsolidated "master" Funds held by consolidated "feeder" Funds.
	-2	During 2014 the Company entered into arrangements with the Parent for the payment of realized benefits associated with certain deferred tax assets, as well as co-investments made by the Company in real-estate and timber strategies of its Affiliates. In accordance with these arrangements, the Company has recorded a liability of $289.5 million as of December 31, 2014. The Company will make quarterly payments to Parents as the benefits under these arrangements become realized.
	-3	The Company provides sub-advisory services in the ordinary course of business to commonly controlled Old Mutual business units. Management fees include amounts earned from these related parties. For the years ended December 31, 2014, 2013, and 2012, $0.3 million, $0.0 million, and $4.6 million, respectively, were earned from discontinued operations.
	-4	The Company conducts a portion of its distribution activities out of the United Kingdom, and has entered into contractual arrangements with a Related Business Unit domiciled there to share its premises and leverage certain of its administrative functions.
	-5	The Company's Parent provides the Company with various oversight services, including governance, which includes compensation for board and executive committees, investor relations, procurement of insurance coverage, human resources, financial reporting, internal audit, treasury, systems, risk and tax services. That portion of the above costs which (i) are directly attributable to the Company, (ii) have been charged to the Company by the Company's Parent and (iii) have been paid to the Parent by the Company, have been recorded in the Company's Consolidated Financial Statements and were $2.1 million, $2.0 million, and $2.7 million for the years ended December 31, 2014, 2013, and 2012, respectively. With respect to the above services which were not directly attributable to the Company, costs associated with these services were generally allocated based on the Company's proportion of the total Parent's consolidated, normalized revenues. In the years ended December 31, 2014, 2013 and 2012, $3.4 million, $3.3 million, and $2.8 million, respectively, of these costs incurred have been allocated to the Company through a non-cash contribution to Parent equity, with the balance of the charges settled in cash. Subsequent to the Offering, these general costs are no longer allocated and if required, are borne directly by the Company.

Accounts_Payable_and_Accrued_L1

Accounts Payable and Accrued Liabilities	12 Months Ended
	Dec. 31, 2014
Accounts Payable and Accrued Liabilities
Schedule of accounts payable and accrued liabilities	Accounts payable and accrued liabilities consisted of the following at December 31 (in millions):
		2014		2013
	Accounts payable	$	10.5	$	16.3
	Accrued expenses		26.1		25.8
	Forward foreign exchange contract liability		—		0.1
	Other		2.9		1.7
	Total accounts payable and accruals	$	39.5	$	43.9

Other_Compensation_Liabilities1

Other Compensation Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Other Compensation Liabilities
Schedule of other compensation liabilities
	Other compensation liabilities consisted of the following at December 31 (in millions):
		2014		2013
	Share-based payments liability (Note 18)	$	42.3	$	86.0
	Non-current compensation payable		2.7		2.2
	Profit interests compensation liability (Note 2)		123.8		77.2
	Voluntary deferral plan liability (Note 17)		59.5		51.2
	Total other compensation liabilities	$	228.3	$	216.6

Borrowings_and_Debt_Tables

Borrowings and Debt (Tables)	12 Months Ended
	Dec. 31, 2014
Borrowings and debt
Schedule of aggregate maturities of debt commitments	As of December 31, 2014, the aggregate maturities of debt commitments, based on their contractual terms, are as follows:
			Long term		Long term		Future
			debt of		debt of		minimum
			OMAM		consolidated		debt
					Funds		commitments
	2015		$	37.0	$	20.0	$	57.0
	2016			—		444.3		444.3
	2017			—		189.7		189.7
	2018			—		75.0		75.0
	2019			177.0		665.0		842.0
	Thereafter			—		2,701.9		2,701.9
	Total		$	214.0	$	4,095.9	$	4,309.9
Consolidated Entity Excluding Consolidated Funds
Borrowings and debt
Schedule of long term debt	The Company's long term debt at December 31, excluding the long term debt of the Company's consolidated Funds was comprised of the following (in millions):
	(in millions)		2014		2013		Interest rate		Maturity
	Third party obligations:
	Revolving credit facility			177.0		—	LIBOR + 1.50%		October 15, 2019
							plus 0.25%
							commitment fee
	Term loan two			—		2.5	5.23%		August 15, 2014
	Total third party obligations			177.0		2.5
	Related party obligations:
	Loan note two			37.0		—	0.00%		September 29, 2024
	Related party credit facility		$	—	$	140.7	LIBOR + 5.58%		March 31, 2018
							plus 0.50% fee
							on undrawn amounts
	Term loan one			—		900.0	6.34%		September 30, 2015
	Total long term debt of the Company		$	214.0	$	1,043.2
Consolidated Funds
Borrowings and debt
Schedule of long term debt	The long term debt of the Company's consolidated Funds was comprised of the following at December 31 (in millions):
	(in millions)		2014		2013		Interest rate		Maturity
	Related party obligations:
	Shareholder loans and note interest		$	318.7	$	339.7	BBSW* + 5.5%		Oct-22
	Promissory note			—		265.0	4.00%		Aug-19
	Total related party obligations:			318.7		604.7
	Third party obligations:
	Term loan A			163.0		163.0	6% - 6.26%		May-16
	Term loan B			261.3		261.5	5.93% – LIBOR + 1.61%		October 1, 2016
	Senior secured notes			860.0		860.0	6.19% - 6.38%		December 1, 2019
	Secured bank loan			109.7		115.4	variable		Oct-17
	Notes payable			2,383.2		2,383.2	LIBOR + margin		Oct-27
	Total third party obligations:			3,777.2		3,783.1
	Total long term debt of consolidated Funds		$	4,095.9	$	4,387.8
	*	BBSW refers to the Australian Bank-Bill Reference Rate

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Taxes
Components of income tax expense (benefit) from continuing operations	The components of income tax expense from continuing operations for the years ended December 31 are as follows (in millions):
		2014			2013			2012
	Current:
	Federal	$	41.6		$	—		$	—
	State		5.1			4.5			(8.0	)
	Foreign		1.3			0.5			0.6
	Total current		48			5			(7.4	)
	Deferred:
	Federal		(37.4	)		12			20.6
	State		0.5			(3.9	)		(10.8	)
	Foreign		1.7			0.2			0.9
	Total deferred		(35.2	)		8.3			10.7
	Total tax expense	$	12.8		$	13.3		$	3.3
Reconciliation of effective income tax rate	The reconciliation of the difference between the Company's U.S. Federal statutory income tax rate and the effective income tax rate for continuing operations for the years ended December 31 is as follows:
		2014			2013			2012
	Tax at U.S. federal statutory income tax rate		35.0	%		35.0	%		35.0	%
	State income taxes, net of federal benefit		(7.3	%)		(2.7	%)		(3.1	%)
	Non-deductible expenses		1.6	%		(0.1	%)		—
	Interest expense		14.7	%		—			—
	Dividends from foreign subsidiaries		(6.6	%)		—			(0.5	%)
	Parent company expense carve-out adjustment		(3.6	%)		(1.4	%)		(2.1	%)
	IPO preparation costs		—			—			(0.3	%)
	Adjustment to liabilities for uncertain tax positions		2.2	%		1.3	%		19.6	%
	Change in valuation allowance		34.9	%		1.0	%		2.5	%
	Effect of foreign operations		2.5	%		0.7	%		1.1	%
	Effect of changes in tax law, rates		(10.8	%)		(1.6	%)		(0.1	%)
	Effect of income from non-controlling interest		(108.4	%)		(48.6	%)		(55.5	%)
	Other		6.1	%		0.5	%		(3.7	%)
	Effective income tax rate for continuing operations		(39.7	%)		(15.9	%)		(7.1	%)
Significant components of deferred tax assets and deferred tax liabilities	The significant components of deferred tax assets and deferred tax liabilities for the years ended December 31 are as follows (in millions):
		2014			2013
	Deferred tax assets:
	Interest expense	$	181.1		$	193.3
	Federal net operating loss		12.7			12.8
	State net operating loss carry forwards		27.2			28.4
	Investment partnerships		121			82.7
	Foreign tax credit carry forwards		6.4			6.4
	Intangible assets		2.5			3.4
	Employee compensation		8.8			4.7
	Other		4.5			8.8
	Total deferred tax assets		364.2			340.5
	Valuation allowance		(33.9	)		(45.9	)
	Deferred tax assets, net of valuation allowance		330.3			294.6
	Deferred tax liabilities:
	Undistributed earnings of subsidiaries		—			0.4
	Net deferred tax asset	$	330.3		$	294.2
Reconciliation of change in gross unrecognized tax benefits
		2014			2013			2012
	Balance as of January 1	$	97.2		$	106.2		$	119.7
	Additions based on tax positions of prior years		—			0.1			0.5
	Reductions for tax provisions of prior years		(1.5	)		(6.9	)		—
	Reductions related to lapses of statutes of limitations		(1.8	)		(2.2	)		(13.8	)
	Settlements		—			—			(0.2	)
	Balance as of December 31	$	93.9		$	97.2		$	106.2

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share
Schedule of calculation of pro forma basic and diluted earnings per share	The calculation of basic and diluted earnings per ordinary share for the years ended December 31, 2014, 2013 and 2012 is as follows (in millions, except per share data):
			2014		2013		2012
	Numerator:
	Net income attributable to controlling interests		$	51.7	$	25.7	$	3.0
	Denominator:
	Weighted-average ordinary shares outstanding—basic*			120,000,000		120,000,000		120,000,000
	Weighted-average ordinary shares outstanding—diluted*			120,000,000		120,000,000		120,000,000
	Pro forma earnings per ordinary share attributable to controlling interests:
	Basic		$	0.43	$	0.21	$	0.03
	Diluted		$	0.43	$	0.21	$	0.03
	*	Reflects pro forma shares outstanding for the periods prior to the Offering on October 8, 2014.

Equitybased_Compensation_Table

Equity-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Changes in the share-based payments liability	The following table presents the changes in the share-based payments liability for the years ended December 31 (in millions):
		2014			2013			2012
	Balance, beginning of period	$	86		$	65.8		$	47.3
	Amortization and revaluation of granted awards		43.4			30			19.1
	Reclassification of modified equity-settled award		—			0.9			3.6
	Reclassification to profit-interests award		(1.7	)		—			—
	Affiliate disposals		(18.0	)		—			(2.4	)
	Repurchases by OMAM (cash settled)		(67.4	)		(10.7	)		(1.8	)
	Balance, end of period	$	42.3		$	86		$	65.8
Schedule of compensation expense in the next five years	The amount of unrecognized compensation expense in relation to non-vested cash-settled equity interests as of December 31, 2014 is $4.3 million, and will be expensed as follows (in millions):
	2015	$	1.7
	2016		1.7
	2017		0.9
	Total	$	4.3
Old Mutual Compensation Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of activity of restricted shares	The following summarizes the grant date fair value of restricted shares granted by the Company in the years ended December 31:
		2014			2013			2012
	Shares granted during the year		3,576,379			1,996,967			1,682,389
	Weighted average grant date fair value per share GBP	£	2.03		£	1.94		£	1.57
	Weighted average grant date fair value per share USD	$	3.35		$	3.03		£	2.49
	The following table summarizes the activity related to restricted shares.
		2014									2013							2012
		Number of			Weighted			Weighted			Number of			Weighted		Weighted		Number of			Weighted		Weighted
		shares			average			average			shares			average		average		shares			average		average
					exercise			exercise						exercise		exercise					exercise		exercise
					price GBP			price USD						price GBP		price USD					price GBP		price USD
	Outstanding at the beginning of the year		3,954,534			£1.73		$	2.85			2,888,925			£1.47	$	2.3		3,103,308			£1.03	$	1.63
	Granted during the year		3,576,379			2.03			3.35			1,996,967			1.94		3.03		1,682,389			1.57		2.49
	Forfeited during the year		(10,711	)		2.03			3.35			(64,778	)		1.51		2.36		—			—		—
	Exercised during the year		(878,217	)		1.45			2.39			(543,708	)		1.25		1.95		(1,882,278	)		0.88		1.4
	Expired during the year		—			—			—			—			—		—		(34,190	)		1.31		2
	Other transfers		(5,959,639	)		n/a			n/a			(322,872	)		—		—		19,696			n/a		—
	Outstanding at the end of the year		682,346			£1.77		$	2.92			3,954,534			£1.73	$	2.7		2,888,925			£1.47	$	2.33
OM Asset Management Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Summary of activity of restricted shares
	The following table summarizes the activity related to restricted shares for the year ended December 31, 2014.
		2014
		Number of			Weighted
		shares			average
					grant date
					fair value
					per share
	Outstanding at the beginning of the year		—		$	—
	Converted during the year		1,212,766			14
	Forfeited during the year		(10,225	)		15.46
	Other transfers		10,225			15.46
	Outstanding at the end of the year		1,212,766		$	14

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2014
Accumulated Other Comprehensive Income
Schedule of components of accumulated other comprehensive income including proportions attributable to non-controlling interests	The components of accumulated other comprehensive income at December 31, were as follows (in millions) including proportions attributable to non-controlling interests:
		2014			2013			2012
	Foreign currency translation including proportion attributable to non-controlling interests	$	(20.4	)	$	(17.9	)	$	1.2

Funds_Derivatives_and_Hedging_

Funds' Derivatives and Hedging (Tables)	12 Months Ended
	Dec. 31, 2014
Funds' Derivatives and Hedging
Tabular disclosure of the average notional value of derivative instruments	The average value of derivative instruments during the year ended December 31, 2014 was as follows (in millions):
		2014			2013
	Average notional value of swaps	$	0.4		$	7.1
	Average value of contracts to buy	$	3.0		$	14.0
	Average value of contracts to sell	$	2.7		$	11.5
Schedule of fair values of derivatives	The fair values of derivatives were as follows at December 31 (in millions):
		Balance sheet classification				2014						2013
		within consolidated funds
		Assets		Liabilities		Assets			Liabilities			Assets			Liabilities
	Derivatives with unrealized gains & losses:
	Forward foreign currency exchange contracts	Other assets		Other liabilities		$	0.5		$	—		$	2.2		$	3.5
	Interest rate contracts	Other assets		Other liabilities			0.4			—			1.4			0.2
	Warrants	Investments		N/A			0.1			—			—			—
	Total return swap contracts	Other assets		Other liabilities			—			—			0.1			0.1
	Other derivatives	Investments		Other liabilities			—			—			0.4			0.4
	Total					$	1.0		$	—		$	4.1		$	4.2
Schedule of effect of derivative instruments on Company's Consolidated Statements of Operations	The effect of derivative instruments on the Company's Consolidated Statements of Operations for the years ended December 31 were as follows (in millions):
				2014						2013						2012
		Income statement classification		Gains			Losses			Gains			Losses			Gains		Losses
	Realized gains (losses):
	Forward foreign currency exchange contracts	OMAM funds net gains (losses):		$	0.1		$	—		$	—		$	(0.1	)	$	0.9		—
	Total return swap contracts	OMAM funds net gains (losses):			—			(0.3	)		—			—			—		—
	Unrealized gains (losses):
	Forward foreign currency exchange contracts	OMAM funds net gains (losses):			—			—			—			(1.7	)		—		—
	Interest rate contracts	OMAM funds net gains (losses):			—			(0.4	)		0.5			—			—		—
	Other derivatives	OMAM funds net gains (losses):			—			—			1.1			—			—		—
	Net change in unrealized appreciation:
	Forward foreign currency exchange contracts	OMAM funds net gains (losses):			0.1			—			—			(4.9	)		0.4		—
	Interest rate contracts	OMAM funds net gains (losses):			0.4			—			—			—			—		—
	Futures contracts	OMAM funds net gains (losses):			—			—			0.4			—			—		—
	Other derivatives	OMAM funds net gains (losses):			—			—			0.6			—			—		—
	Total			$	0.6		$	(0.7	)	$	2.6		$	(6.7	)	$	1.3	$	—

Discontinued_Operations_and_Re1

Discontinued Operations and Restructuring (Tables)	12 Months Ended
	Dec. 31, 2014
Discontinued Operations and Restructuring
Schedule of gain (loss) from discontinued operations	The Company's gain (loss) from discontinued operations was comprised of the following at December 31 (in millions, except for per share data):
		2014			2013			2012
	Revenues	$	38		$	84.8		$	137.6
	Compensation expense		30.9			50.7			102.1
	Depreciation		0.2			0.5			1.7
	Other operating expenses		9.8			16.2			37.6
	Amortization and impairment of goodwill & intangibles		—			0.1			32.7
	Operating income (loss)		(2.9	)		17.3			(36.5	)
	Investment gain (loss) of consolidated Funds		2.8			(9.4	)		6
	Net interest income (expense)		0.1			—			(0.2	)
	Income (loss) before taxes		0			7.9			(30.7	)
	Income taxes		1.1			5.2			(3.7	)
	Discontinued net income (loss)		(1.1	)		2.7			(27.0	)
	Gain (loss) on disposal, net of tax of $(1.5), $2.3, and $(7.7)		2.3			(2.1	)		10.8
	Total discontinued operations		1.2			0.6			(16.2	)
	Attributable to non-controlling interests		4.7			(5.8	)		4.9
	Attributable to controlling interests	$	(3.5	)	$	6.4		$	(21.1	)
	Pro forma earnings (loss) per share (basic and diluted) attributable to controlling interests	$	(0.03	)	$	0.05		$	(0.18	)
Rollforward of liabilities associated with discontinued operations and restructuring
	Liabilities associated with discontinued operations and restructuring are summarized as follows as of December 31 (in millions):
		2014			2013
	Beginning balance at January 1	$	8.6		$	11.1
	Abandoned lease liability principle payments		(0.4	)		(0.7	)
	Accrual of wind-up costs in relation to discontinued operation		0.3			2.8
	Payment of wind-up costs in relation to discontinued operation		(2.6	)		(0.2	)
	Adjustment to sub-lease arrangement on abandoned lease		1.2			0.6
	Drawdowns on committed funding		(1.5	)		(5.0	)
	Ending balance at December 31	$	5.6		$	8.6

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Information
Schedule of economic net income by segment	Economic Net Income is comprised of the following for each of the years ended December 31 (in millions):
			2014			2013			2012
	Management fees		$	589.9		$	499.8		$	420.9
	Performance fees			34.3			18.1			14.1
	Other income, including equity-accounted subsidiaries			11.2			9.6			15.8
	Total ENI Revenue			635.4			527.5			450.8
	Fixed compensation & benefits			120.2			111.4			104
	General and administrative expenses			94.6			76.5			71.1
	Depreciation and amortization			6.1			4.9			5.7
	Total ENI Operating expenses			220.9			192.8			180.8
	Earnings before variable compensation			414.5			334.7			270
	Variable compensation			169.8			153.8			121
	Earnings after variable compensation			244.7			180.9			149
	Affiliate key employee distributions			40.1			28.4			19.1
	Earnings after Affiliate key employee distributions			204.6			152.5			129.9
	Net interest income			(0.5	)		0.5			1.4
	Pre-tax economic net income			204.1			153			131.3
	Tax on economic net income			52.8			30.1			19
	Economic net income		$	151.3		$	122.9		$	112.3
	ENI operating margin before Affiliate key employee distributions*			39	%		34	%		33	%
	ENI operating margin after Affiliate key employee distributions**			32	%		29	%		29	%
	*	ENI operating margin before Affiliate key employee distributions is calculated based on earnings after variable compensation divided by ENI Revenue.
	**	ENI operating margin after Affiliate key employee distributions is calculated based on earnings after key employee distributions divided by ENI Revenue.
Reconciliation of Economic Net Income to U.S. GAAP	The following table reconciles Economic Net Income to U.S. GAAP net income (loss) attributable to controlling interests for the years ended December 31 (in millions):
					2014			2013			2012
	GAAP net income (loss) attributable to controlling interests				$	51.7		$	25.7		$	3
	Adjustments related to restructuring and reorganization actions undertaken in connection with this offering:
	i		Non-cash notional parent corporate cost allocation			3.4			3.3			2.8
	ii		Intercompany interest expense			49.8			72.2			84
	iii		Co-investment (gain)			(2.6	)		(3.0	)		(1.2	)
	iv		Initial public offering costs			—			—			0.4
	Adjustments to reflect the economic earnings of our Company:
	v		Non-cash key employee-owned equity and profit-interest revaluations(1)			83			47.7			16.2
	vi		Amortization and impairment of goodwill and acquired intangible assets			0.1			0.1			1.8
	vii		Discontinued operations attributable to controlling interests and Restructuring			5.8			(6.3	)		21
	viii		ENI tax normalization			(6.7	)		1.2			(9.0	)
	Tax effect of above adjustments					(33.2	)		(18.0	)		(6.7	)
	Economic net income after taxes				$	151.3		$	122.9		$	112.3
	-1	2014 amount includes $31.6 million related to the purchase of additional ownership interests in an Affiliate. Please see the Company's Prospectus for additional information regarding this transaction which was completed on October 9, 2014.
Reconciliation of Revenue Included Within Economic Net Income to U.S. GAAP
			2014			2013			2012
	Revenue included within economic net income(1)		$	635.4		$	527.5		$	450.8
	Exclude investment return on equity-accounted affiliates			(9.6	)		(7.7	)		(15.3	)
	Additional Revenue from consolidated Funds			430.5			408.8			268
	U.S. GAAP Revenue		$	1,056.30		$	928.6		$	703.5
	-1	Sourced entirely from operations in the United States
Schedule of assets by geographical area
			2014			2013
	Total assets domiciled in the United Kingdom		$	—		$	51.8
	Total assets domiciled in the United States			993.2			962.6
	Total assets, excluding impact of consolidated Funds		$	993.2		$	1,014.4

Selected_Quarterly_Financial_D1

Selected Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2014
Selected Quarterly Financial Data
Summary of the quarterly results of operations	The following is a summary of the quarterly results of operations of the Company for the years ended December 31, ($ in millions, unless otherwise noted):
			2014
			First Quarter			Second Quarter			Third Quarter			Fourth Quarter
	Revenue		$	269.4		$	260.4		$	260		$	266.5
	Operating income (loss)			5.6			(45.5	)		(18.2	)		(9.1	)
	Income (loss) from continuing operations before income taxes			8.4			(44.1	)		(15.7	)		19.2
	Net income (loss)			4.1			(55.6	)		(8.4	)		16.1
	Net income (loss) attributable to controlling interests			10.3			8.8			(1.7	)		34.3
	Basic and fully diluted earnings per share ($)		$	0.08		$	0.08		$	(0.01	)	$	0.28
	Basic and fully diluted shares outstanding (in millions)*			120			120			120			120
			2013
			First Quarter			Second Quarter			Third Quarter			Fourth Quarter
	Revenue		$	223.6		$	247		$	209.7		$	248.3
	Operating loss			(13.8	)		(51.4	)		(5.2	)		(29.1	)
	Loss from continuing operations before income taxes			(11.6	)		(56.2	)		(2.2	)		(13.8	)
	Net loss			(11.3	)		(70.0	)		(5.1	)		(10.1	)
	Net income attributable to controlling interests			6.2			5.5			6.9			7.1
	Basic and fully diluted earnings per share ($)		$	0.05		$	0.04		$	0.06		$	0.06
	Basic and fully diluted shares outstanding (in millions)*			120			120			120			120
	*	Reflects pro forma shares outstanding in prior periods

Organization_and_Description_o1

Organization and Description of the Business (Details) (USD $)	9 Months Ended	12 Months Ended	1 Months Ended	0 Months Ended
In Millions, except Share data, unless otherwise specified	Oct. 15, 2014	Dec. 31, 2014	Dec. 31, 2014	Oct. 15, 2014	Dec. 31, 2013
		segment
Organization and description of the business
Number of reportable segment		1
Fair value of co-investments		$154.80	$154.80		$501.40
Additional ownership purchase in cash	60
OMGUK
Organization and description of the business
Pre-offering dividend paid	175			175
Redemption of intercompany receivable	32.2
Net reduction of existing intercompany debt	971.3
Carrying value of co-investments		35	35
Fair value of co-investments		43.5	43.5
OMGUK | Revolving credit facility
Organization and description of the business
Debt proceeds used for payment of related party dividend	175
OMGUK | Term loan two
Organization and description of the business
Debt issued	37			37
OMGUK
Organization and description of the business
Elimination of existing intercompany debt	1,003.50			1,003.50
Estimated payment of future realizable benefits			252.2
Consolidated Entity Excluding Consolidated Funds
Organization and description of the business
Debt issued		37	37		1,040.70
Fair value of co-investments		94.2	94.2		95.2
Ordinary shares, issued shares	120,000,000	120,000,000	120,000,000	120,000,000
Ordinary shares, nominal value (in dollars per share)	$0.00	$0.00	$0.00	$0.00
Consolidated Entity Excluding Consolidated Funds | Revolving credit facility
Organization and description of the business
Debt proceeds used for payment of related party dividend				$175

Basis_of_Presentation_and_Sign2

Basis of Presentation and Significant Accounting Policies (Details)	0 Months Ended
	Oct. 15, 2014
IPO
Basis of presentation
Ordinary shares, issued shares	22,000,000
Overallotment option
Basis of presentation
Ordinary shares, issued shares	2,231,375

Basis_of_Presentation_and_Sign3

Basis of Presentation and Signficant Accounting Policies (Details 2) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allocated Costs from the Parent
Related party expenses	$61	$82.50	$94.20
Old Mutual plc | Recharged operational costs directly attributable to Company
Allocated Costs from the Parent
Related party expenses	2.1	2	2.7
Old Mutual plc | Recharged operational costs not directly attributable to Company
Allocated Costs from the Parent
Related party expenses	$3.40	$3.30	$2.80

Basis_of_Presentation_and_Sign4

Basis of Presentation and Significant Accounting Policies (Details 3) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating segment
Number of operating segments	1
Foreign currency translation
Number of timber funds whose books and records are not maintained in U.S. dollars	1
Timber and Timberlands
Timber Funds
Period after Planting Subsequent to which Costs Incurred Considered to be Maintenance and Expensed as Incurred	2 years
Impairment charges	$0	$0	$0

Basis_of_Presentation_and_Sign5

Basis of Presentation and Significant Accounting Policies (Details 4)	12 Months Ended
	Dec. 31, 2014
Office equipment | Minimum
Property and equipment
Property, Plant and Equipment, Useful Life	3 years
Office equipment | Maximum
Property and equipment
Property, Plant and Equipment, Useful Life	5 years
Furniture and fixtures | Minimum
Property and equipment
Property, Plant and Equipment, Useful Life	3 years
Furniture and fixtures | Maximum
Property and equipment
Property, Plant and Equipment, Useful Life	5 years
Software and web development | Maximum
Property and equipment
Property, Plant and Equipment, Useful Life	3 years

Basis_of_Presentation_and_Sign6

Basis of Presentation and Significant Accounting Policies (Details 5)	0 Months Ended	9 Months Ended	12 Months Ended	24 Months Ended
In Millions, unless otherwise specified	Oct. 07, 2014	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
			item
Goodwill
Number of reporting units			5
Number of consolidated affiliates represented as reporting units			5
Earnings per share
Pro forma shares used for calculating basic and fully diluted EPS	120	120		120
Client relationships | Minimum
Intangible assets
Useful life			5 years
Client relationships | Maximum
Intangible assets
Useful life			16 years

Basis_of_Presentation_and_Sign7

Basis of Presentation and Significant Accounting Policies (Details 6) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compensation arrangements
Minimum vesting period of long term profit-interest plan	3 years
Maximum vesting period of long term profit-interest plan	5 years
Period of earnings on which multiple for redemption of long term profit-interest compensation awards is based	12 months
Deferred financing costs
Write off of deferred financing costs	$0	$0	$0.40
Consolidated Entity Excluding Consolidated Funds
Non-controlling interests
Non-controlling interests	$0	$0.10	$0.90

Investment_Details

Investment (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investment Components
Investments at fair value	$154.80	$501.40
Equity-accounted investments in Affiliates (Note 6)	50.5	48.5
Equity-accounted investments in unconsolidated funds, at cost (Note 6)	0.5
Investments in joint ventures	2.4	2.9
Other investments	1.7	1.5
Investments	209.9	554.3
Consolidated Entity Excluding Consolidated Funds
Investment Components
Investments at fair value	94.2	95.2
Investments	149.3	148.1
Investment income
Investment income	12.2	10.7	16.5
Consolidated Entity Excluding Consolidated Funds | Investments in products held at fair value attributable to controlling interests
Investment Components
Investments at fair value	34.5	43.8
Investment income
Investment income	2.6	3	1.7
Consolidated Entity Excluding Consolidated Funds | Investments by consolidated funds in related, unconsolidated master funds
Investment Components
Investments at fair value	34.5	43.1
Investment income
Investment income	1.9	2.9	1.7
Consolidated Entity Excluding Consolidated Funds | Other discretionary investments held at fair value
Investment Components
Investments at fair value		0.7
Investment income
Investment income	0.7	0.1
Consolidated Entity Excluding Consolidated Funds | Investments related to voluntary deferred compensation plans held at fair value
Investment Components
Investments at fair value	59.7	51.4
Consolidated Entity Excluding Consolidated Funds | Investments in equity - accounted affiliates
Investment income
Investment income	9.6	7.7	14.8
Consolidated Funds
Investment Components
Investments at fair value	60.6	406.2
Consolidated Funds | Investments by consolidated funds in related, unconsolidated master funds
Investment Components
Investments at fair value	23.6	19.8
Consolidated Funds | Other discretionary investments held at fair value
Investment Components
Investments at fair value	$37	$386.40

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets of OMAM and consolidated Funds
Total investments at fair value	154.8	$501.40
Recurring
Assets of OMAM and consolidated Funds
Total fair value assets	259.3	675.5
Recurring | Quoted prices in active markets (Level I)
Assets of OMAM and consolidated Funds
Total fair value assets	190.5	197.1
Recurring | Significant other observable inputs (Level II)
Assets of OMAM and consolidated Funds
Total fair value assets	34.3	435.3
Recurring | Significant unobservable inputs (Level III)
Assets of OMAM and consolidated Funds
Total fair value assets	34.5	43.1
Consolidated Funds
Assets of OMAM and consolidated Funds
Total investments at fair value	60.6	406.2
Consolidated Funds | Recurring
Assets of OMAM and consolidated Funds
Total investments at fair value	60.6	406.2
Restricted cash held at fair value	104.5	174.1
Total fair value assets	165.1	580.3
Liabilities of consolidated Funds
Total fair value liabilities	-16.4	-28.8
Consolidated Funds | Recurring | Common stock
Liabilities of consolidated Funds
Total fair value liabilities	-16.4	-24.6
Consolidated Funds | Recurring | Forward exchange contracts
Liabilities of consolidated Funds
Total fair value liabilities		-3.5
Consolidated Funds | Recurring | Interest rate swap
Liabilities of consolidated Funds
Total fair value liabilities		-0.1
Consolidated Funds | Recurring | Other derivatives
Liabilities of consolidated Funds
Total fair value liabilities		-0.6
Consolidated Funds | Recurring | Common and preferred stock
Assets of OMAM and consolidated Funds
Total investments at fair value	24.8	52
Consolidated Funds | Recurring | Short-term investment funds
Assets of OMAM and consolidated Funds
Total investments at fair value	0.1	8.8
Consolidated Funds | Recurring | Fixed income securities
Assets of OMAM and consolidated Funds
Total investments at fair value	1.1	207
Consolidated Funds | Recurring | Collective investment funds
Assets of OMAM and consolidated Funds
Total investments at fair value	32.5	9.1
Consolidated Funds | Recurring | Corporate Debt
Assets of OMAM and consolidated Funds
Total investments at fair value		54.1
Consolidated Funds | Recurring | Other Investments
Assets of OMAM and consolidated Funds
Total investments at fair value	2.1	71.1
Consolidated Funds | Recurring | Derivatives
Assets of OMAM and consolidated Funds
Total investments at fair value		4.1
Consolidated Funds | Recurring | Quoted prices in active markets (Level I)
Assets of OMAM and consolidated Funds
Total investments at fair value	26.3	64.5
Restricted cash held at fair value	104.5	80.5
Total fair value assets	130.8	145
Liabilities of consolidated Funds
Total fair value liabilities	-16.4	-28.2
Consolidated Funds | Recurring | Quoted prices in active markets (Level I) | Common stock
Liabilities of consolidated Funds
Total fair value liabilities	-16.4	-24.6
Consolidated Funds | Recurring | Quoted prices in active markets (Level I) | Forward exchange contracts
Liabilities of consolidated Funds
Total fair value liabilities		-3.4
Consolidated Funds | Recurring | Quoted prices in active markets (Level I) | Other derivatives
Liabilities of consolidated Funds
Total fair value liabilities		-0.2
Consolidated Funds | Recurring | Quoted prices in active markets (Level I) | Common and preferred stock
Assets of OMAM and consolidated Funds
Total investments at fair value	24.8	52
Consolidated Funds | Recurring | Quoted prices in active markets (Level I) | Short-term investment funds
Assets of OMAM and consolidated Funds
Total investments at fair value	0.1	8.8
Consolidated Funds | Recurring | Quoted prices in active markets (Level I) | Fixed income securities
Assets of OMAM and consolidated Funds
Total investments at fair value	1.1
Consolidated Funds | Recurring | Quoted prices in active markets (Level I) | Other Investments
Assets of OMAM and consolidated Funds
Total investments at fair value	0.3	0.9
Consolidated Funds | Recurring | Quoted prices in active markets (Level I) | Derivatives
Assets of OMAM and consolidated Funds
Total investments at fair value		2.8
Consolidated Funds | Recurring | Significant other observable inputs (Level II)
Assets of OMAM and consolidated Funds
Total investments at fair value	34.3	341.7
Restricted cash held at fair value		93.6
Total fair value assets	34.3	435.3
Liabilities of consolidated Funds
Total fair value liabilities		-0.6
Consolidated Funds | Recurring | Significant other observable inputs (Level II) | Forward exchange contracts
Liabilities of consolidated Funds
Total fair value liabilities		-0.1
Consolidated Funds | Recurring | Significant other observable inputs (Level II) | Interest rate swap
Liabilities of consolidated Funds
Total fair value liabilities		-0.1
Consolidated Funds | Recurring | Significant other observable inputs (Level II) | Other derivatives
Liabilities of consolidated Funds
Total fair value liabilities		-0.4
Consolidated Funds | Recurring | Significant other observable inputs (Level II) | Fixed income securities
Assets of OMAM and consolidated Funds
Total investments at fair value		207
Consolidated Funds | Recurring | Significant other observable inputs (Level II) | Collective investment funds
Assets of OMAM and consolidated Funds
Total investments at fair value	32.5	9.1
Consolidated Funds | Recurring | Significant other observable inputs (Level II) | Corporate Debt
Assets of OMAM and consolidated Funds
Total investments at fair value		54.1
Consolidated Funds | Recurring | Significant other observable inputs (Level II) | Other Investments
Assets of OMAM and consolidated Funds
Total investments at fair value	1.8	70.2
Consolidated Funds | Recurring | Significant other observable inputs (Level II) | Derivatives
Assets of OMAM and consolidated Funds
Total investments at fair value		1.3
Consolidated Entity Excluding Consolidated Funds
Assets of OMAM and consolidated Funds
Total investments at fair value	94.2	95.2
Consolidated Entity Excluding Consolidated Funds | Recurring
Assets of OMAM and consolidated Funds
Total investments at fair value	94.2	95.2
Investment securities	59.7	52.1
Investments in unconsolidated funds	34.5	43.1
Consolidated Entity Excluding Consolidated Funds | Recurring | Quoted prices in active markets (Level I)
Assets of OMAM and consolidated Funds
Total investments at fair value	59.7	52.1
Investment securities	59.7	52.1
Consolidated Entity Excluding Consolidated Funds | Recurring | Significant unobservable inputs (Level III)
Assets of OMAM and consolidated Funds
Total investments at fair value	34.5	43.1
Investments in unconsolidated funds	34.5	$43.10
Consolidated Entity Excluding Consolidated Funds | Recurring | Significant unobservable inputs (Level III) | Real estate investment funds | Minimum
Liabilities of consolidated Funds
Term over which the underlying assets are expected to be liquidated by the investees	1 year
Consolidated Entity Excluding Consolidated Funds | Recurring | Significant unobservable inputs (Level III) | Real estate investment funds | Maximum
Liabilities of consolidated Funds
Term over which the underlying assets are expected to be liquidated by the investees	8 years

Fair_Value_Measurements_Detail1

Fair Value Measurements (Details 2) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in Level III assets and liabilities
Transfers in and/or out of Level 3	$0	$0
Consolidated Entity Excluding Consolidated Funds | Real estate investment funds
Changes in Level III assets and liabilities
Balance	43.1	44.5
Realized gain	1.9	7.1
Net change in unrealized depreciation	-5.1	-4.2
Purchases, issuances or settlements		0.6
Dispositions	-5.4	-4.9
Balance	34.5	43.1	44.5
Losses/Gains related to Level III changes recorded in Consolidated Statement of Operations	($3.20)	$2.90	$1.70

Variable_Interest_Entities_Det

Variable Interest Entities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Assets
Investments at fair value	$154.80	$501.40
Consolidated VIEs
Assets
Investments at fair value	5.9	90.9
Restricted cash	2,487.70	2,557
Timber assets	4,053.20	4,172.50
Other assets of consolidated Funds	165	145
Total Assets	6,711.80	6,965.40
Liabilities
Borrowings	4,095.90	4,146
Other liabilities of consolidated Funds	150.8	77.2
Total Liabilities	4,246.70	4,223.20
Unconsolidated VIEs
Liabilities
Unconsolidated VIE assets	9,993.50	12,156.80
Unconsolidated VIE liabilities	1,515	1,720.40
Equity interests on the Condensed and Consolidated Balance Sheet	75.3	78.4
Maximum risk of loss	$75.50	$81.10

Equity_Accounted_Investees_Det

Equity Accounted Investees (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Income
Net revenues	$316.50	$298.40	$327.30
Operating income (loss)	68.2	69.8	98.8
Other income (expense), net	-76	159.4	62.4
Income (loss) before income taxes	-7.8	229.2	161.2
Less: income tax expense (benefit)	-4.9	-1.4	-0.6
Excluding noncontrolling interests income (loss)	-31.2	204.8	130.9
Net income attributable to controlling interests	18.5	23	29.7
OMAM equity in net income of equity method investees	11.5	10.6	16.5
Balance Sheet
Current assets	650.5	184.4
Noncurrent assets	2,316.50	2,812.80
Total assets	2,967	2,997.20
Current liabilities	276.3	444.8
Long-term liabilities	857.6	694.2
Non-controlling interests in subsidiaries	1,771.30	1,783.90
Members' equity	61.8	74.3
OMAM equity investment and undistributed earnings of affiliated companies, before consolidating and reconciling adjustments	54.9	61.8
Consolidating and reconciling adjustments:
Goodwill attributable to equity method investment	30.6	29.8
OMAM investment in equity method investees at cost plus equity in undistributable earnings since acquisition	85.5	91.6
Earnings from equity method investees	11.5	10.6	16.5
Investments in joint ventures	2.4	2.9
Heitman LLC
Statement of Income
Net revenues	227.4	218.3	242.3
Operating income (loss)	51	49	72.2
Other income (expense), net	26.1	172.8	129.3
Income (loss) before income taxes	77.1	221.8	201.5
Less: income tax expense (benefit)	-3	-1.8	-0.6
Excluding noncontrolling interests income (loss)	58.6	197.2	173.6
Net income attributable to controlling interests	15.5	22.8	27.3
OMAM equity in net income of equity method investees	8.5	10.4	14.1
Balance Sheet
Current assets	103.9	125.7
Noncurrent assets	1,543.20	1,785.40
Total assets	1,647.10	1,911.10
Current liabilities	65.8	65.9
Long-term liabilities	515.3	645.4
Non-controlling interests in subsidiaries	1,014.40	1,140.20
Members' equity	51.6	59.6
OMAM equity investment and undistributed earnings of affiliated companies, before consolidating and reconciling adjustments	44.7	47.1
Consolidating and reconciling adjustments:
Goodwill attributable to equity method investment	30.6	29.8
OMAM investment in equity method investees at cost plus equity in undistributable earnings since acquisition	75.3	76.9
Earnings from equity method investees	8.5	10.4	14.1
Other
Statement of Income
Net revenues	89.1	80.1	85
Operating income (loss)	17.2	20.8	26.6
Other income (expense), net	-102.1	-13.4	-66.9
Income (loss) before income taxes	-84.9	7.4	-40.3
Less: income tax expense (benefit)	-1.9	0.4
Excluding noncontrolling interests income (loss)	-89.8	7.6	-42.7
Net income attributable to controlling interests	3	0.2	2.4
OMAM equity in net income of equity method investees	3	0.2	2.4
Balance Sheet
Current assets	546.6	58.7
Noncurrent assets	773.3	1,027.40
Total assets	1,319.90	1,086.10
Current liabilities	210.5	378.9
Long-term liabilities	342.3	48.8
Non-controlling interests in subsidiaries	756.9	643.7
Members' equity	10.2	14.7
OMAM equity investment and undistributed earnings of affiliated companies, before consolidating and reconciling adjustments	10.2	14.7
Consolidating and reconciling adjustments:
OMAM investment in equity method investees at cost plus equity in undistributable earnings since acquisition	10.2	14.7
Earnings from equity method investees	3	0.2	2.4
Joint ventures | Affiliate
Statement of Income
OMAM equity in net income of equity method investees	1.4	2.1	2.4
Consolidating and reconciling adjustments:
Earnings from equity method investees	1.4	2.1	2.4
Investments in joint ventures	2.4	2.9
Difference between carrying value of investment and its underlying net asset value	$0

Property_and_Equipment_and_Lea2

Property and Equipment and Lease Commitments (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Office space
Gross minimum rentals
2015	$11.70
2016	11
2017	10.2
2018	9.8
2019	9.5
Thereafter	22.7
Total	74.9
Sub-lease rentals
2015	-0.2
Total	-0.2
Net minimum rentals
2015	11.5
2016	11
2017	10.2
2018	9.8
2019	9.5
Thereafter	22.7
Total	74.7
Consolidated rent and occupancy expenses	10.6	8.8	8
Timber lease rights
Gross minimum rentals
2015	1.2
2016	1.1
2017	1.1
2018	1
2019	1.1
Thereafter	13.1
Total	18.6
Net minimum rentals
2015	1.2
2016	1.1
2017	1.1
2018	1
2019	1.1
Thereafter	13.1
Total	18.6
Consolidated Entity Excluding Consolidated Funds
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	65.1	84.9
Accumulated depreciation and amortization	-41	-60.8
Property and equipment, net	24.1	24.1
Depreciation and amortization	6.1	4.9	5.8
Consolidated Entity Excluding Consolidated Funds | Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	26.7	27.6
Consolidated Entity Excluding Consolidated Funds | Office equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	17.5	24.4
Consolidated Entity Excluding Consolidated Funds | Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	6.6	8
Consolidated Entity Excluding Consolidated Funds | Software and web development
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	14.3	24.9
Consolidated Funds | Timber lease rights
Net minimum rentals
Consolidated funds timber lease rights expense	$10.70	$9.20	$9.20

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Gross Book Value
Beginning balance	$160.60	$160.60
Additions	11
Disposals	-11.2
Ending balance	160.4	160.6	160.6
Accumulated Impairment
Beginning balance	-42.8	-42.8
Disposals	8.9
Ending balance	-33.9	-42.8	-42.8
Net Book Value
Beginning balance	117.8	117.8
Additions	11
Disposals	-2.3
Ending balance	126.5	117.8	117.8
Goodwill impairment, including discontinued operations	0	0	7.6
Goodwill impairment, continuing operations	0	0	1.7
Goodwill impairment, discontinued	0	0	5.9
Goodwill disposal write-off attributable to discontinued operations	11.2
Amortization	0.1	0.1	0.1
Goodwill Impairment Charge	$33.90	$42.80	$42.80

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets (Details 2) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Amortization & Impairment
Amortization	($0.10)	($0.20)	($2.30)
Net Book Value
Amortization	-0.1	-0.2	-2.3
Ending balance	1
Amortization	0.1	0.1	0.1
Amortization expense, discontinued operations	0	0.1	2.2
Impairment charges, discontinued operations			24.5
Estimated annual amortization expense for each of next five fiscal years
2015	0.1
2016	0.1
2017	0.1
2018	0.1
2019	0.1
2020 and thereafter	0.5
Total	1
Client relationships
Gross Book Value
Beginning Balance	26.8	26.8
Disposals	-4.1
Ending Balance	22.7	26.8
Accumulated Amortization & Impairment
Beginning Balance	-25.6	-25.4
Amortization	-0.1	-0.2
Disposals	4
Ending Balance	-21.7	-25.6
Net Book Value
Beginning balance	1.2	1.4
Amortization	-0.1	-0.2
Disposals	-0.1
Ending balance	1	1.2
Useful life	9 years
Estimated annual amortization expense for each of next five fiscal years
Total	$1	$1.20

Timber_and_Timberlands_Details

Timber and Timberlands (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Timber
Timber and timberlands
Total timber and timberlands, at cost	$2,813.70	$3,027.70
Timberlands
Timber and timberlands
Total timber and timberlands, at cost	1,880.50	1,913.60
Timber lease rights
Timber and timberlands
Total timber and timberlands, at cost	198.8	198.8
Other
Timber and timberlands
Total timber and timberlands, at cost	27.1	74.7
Consolidated Funds
Timber and timberlands
Timber and timberlands, net	4,053.20	4,422.10
Consolidated Funds | Timber and Timberlands
Timber and timberlands
Total timber and timberlands, at cost	4,920.10	5,214.80
Accumulated depletion on timber	-866	-791.9
Accumulated amortization	-0.9	-0.8
Timber and timberlands, net	$4,053.20	$4,422.10

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Amounts due from related parties
Current receivables from related parties	$28.20	$38.70
Total long-term receivables from related parties		32.2
Total amounts due from related parties	28.2	70.9
Amounts due to related parties
Total current payables to related parties	57.2	31.9
Total long-term payables to related parties	604.8	1,645.40
Total amounts due to related parties	662	1,677.30
Total related party investments	111.5	114.3
Related party revenues (included discontinued operations)	70.4	70.2	66.3
Related party expenses	61	82.5	94.2
Old Mutual plc
Amounts due from related parties
Interest receivable		1.8
Other current amounts due from related parties	1.8	0.1
Other long-term amounts due from related parties		2.1
Loan notes receivable		30.1
Amounts due to related parties
Payable for benefits realized under arrangements	289.5
Old Mutual plc | Financing
Amounts due to related parties
Related party expenses	49.8	72.1	84.1
Old Mutual plc | Restricted stock grants of parent equity
Amounts due to related parties
Related party expenses	4.5	5	2.9
Old Mutual plc | Recharged operational costs
Amounts due to related parties
Related party expenses	5.5	5.3	5.5
Old Mutual plc | Recharged operational costs directly attributable to Company
Amounts due to related parties
Related party expenses	2.1	2	2.7
Old Mutual plc | Recharged operational costs not directly attributable to Company
Amounts due to related parties
Related party expenses	3.4	3.3	2.8
Unconsolidated Funds
Amounts due from related parties
Fees receivable	18.2	26.8
Amounts due to related parties
Total related party investments	23.6	19.8
Unconsolidated Funds | Management fees
Amounts due to related parties
Related party revenues (included discontinued operations)	47.5	46.4	43.3
Unconsolidated Funds | Performance fees collected (performance penalties paid)
Amounts due to related parties
Related party revenues (included discontinued operations)	5.9	0.5	-0.2
Commonly controlled Old Mutual plc business units
Amounts due from related parties
Fees receivable	2.3	2.2
Commonly controlled Old Mutual plc business units | Management fees
Amounts due to related parties
Related party revenues (included discontinued operations)	10.6	9.6	12.2
Related party revenues from discontinued operations	0.3	0	4.6
Commonly controlled Old Mutual plc business units | Rent and administrative costs recharged
Amounts due to related parties
Related party expenses	1.2	0.1	1.7
Joint venture partners and other
Amounts due from related parties
Current receivables from related parties	5.3	7.6
Joint ventures
Amounts due to related parties
Total related party investments	2.4	2.9
Joint ventures | Management fees
Amounts due to related parties
Related party revenues (included discontinued operations)	6.4	13.7	11
Other related parties
Amounts due from related parties
Other current amounts due from related parties	0.6	0.2
Equity- accounted investees
Amounts due to related parties
Total related party investments	85.5	91.6
Consolidated Entity Excluding Consolidated Funds | Old Mutual plc
Amounts due to related parties
Interest payable		14.6
Other current amounts due to related parties	3.5
Notes payable to related parties	37
Other long-term amounts due to related parties	286.1
Consolidated Entity Excluding Consolidated Funds | Old Mutual plc | Revolving credit facility
Amounts due to related parties
Notes payable to related parties		140.7
Consolidated Entity Excluding Consolidated Funds | Old Mutual plc | Term loan one
Amounts due to related parties
Notes payable to related parties		900
Consolidated Entity Excluding Consolidated Funds | Other related parties
Amounts due to related parties
Other current amounts due to related parties	0.4	1
Consolidated Funds
Amounts due to related parties
Preferred dividend payable	16.3	16.3
Notes payable to related parties	$318.70	$604.70

Related_Party_Transactions_Det1

Related Party Transactions (Details 2) (USD $)	12 Months Ended			0 Months Ended	1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 29, 2014	Dec. 31, 2011
Related party transactions
Earnings from equity method investees	$11,500,000	$10,600,000	$16,500,000
Affiliated and Joint ventures
Related party transactions
Earnings from equity method investees	9,800,000	9,800,000	17,200,000
Joint ventures
Related party transactions
Dividends from joint ventures	1,200,000	1,900,000	1,200,000
Expenses recharged to investee	300,000	300,000	300,000
Affiliate
Related party transactions
Tax payments made on behalf of employees	5,300,000	4,500,000
Unconsolidated Funds
Related party transactions
Investment return recognized	-3,200,000	2,900,000	1,700,000
Old Mutual plc | Loan note two
Related party transactions
Debt issued				37,000,000	30,100,000
Term of loan				10 years	2 years
Old Mutual plc | Loan note two | Minimum
Related party transactions
Quarterly principal payment				1,000,000
Old Mutual plc | Loan note two | Two year U.S. dollar swap rate
Related party transactions
Basis spread on variable rate (as a percent)					7.28%
Commonly controlled Old Mutual plc business units
Related party transactions
Sublease payments received	$1,000,000	$1,000,000	$1,200,000

Accounts_Payable_and_Accrued_L2

Accounts Payable and Accrued Liabilities (Details) (Consolidated Entity Excluding Consolidated Funds, USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Consolidated Entity Excluding Consolidated Funds
Accounts Payable	$10.50	$16.30
Accrued Expenses	26.1	25.8
Forward foreign exchange contract liability		0.1
Other	2.9	1.7
Accounts payable and accrued expenses	$39.50	$43.90

Other_Compensation_Liabilities2

Other Compensation Liabilities (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Compensation Liabilities
Share-based payments liability	$42.30	$86
Non-current compensation payable	2.7	2.2
Profit interests compensation liability	123.8	77.2
Voluntary deferral plan liability	59.5	51.2
Total other compensation liabilities	228.3	216.6
Profit interests compensation expense including discontinued operations in 2012 and 2013	51	29	12.3
Issuances of additional profit sharing interests for cash	0.6	0.2	0
Redemption of profit sharing interests for cash	$6.80	$0.90	$0.40

Borrowings_and_Debt_Details

Borrowings and Debt (Details) (USD $)	0 Months Ended		1 Months Ended	12 Months Ended			0 Months Ended							1 Months Ended
	Oct. 15, 2014	Sep. 29, 2014	Dec. 31, 2011	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 15, 2014	Dec. 15, 2013	Nov. 01, 2013	Dec. 01, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2005	Mar. 31, 2013	Dec. 31, 2008	Aug. 31, 2014
Borrowings and debt
Total				$4,309,900,000
Aggregate maturities
2015				57,000,000
2016				444,300,000
2017				189,700,000
2018				75,000,000
2019				842,000,000
Thereafter				2,701,900,000
Total				4,309,900,000
Revolving credit facility | One Month Adjusted London Interbank Offered Rate LIBOR | Maximum
Borrowings and debt
Variable rate additional margin (as a percent)	1.00%
Loan note two | Old Mutual plc
Borrowings and debt
Debt issued		37,000,000	30,100,000
Term of loan		10 years	2 years
Loan note two | Minimum | Old Mutual plc
Borrowings and debt
Installment payment		1,000,000
Consolidated Entity Excluding Consolidated Funds
Borrowings and debt
Total third party obligations				177,000,000	2,500,000
Total related party obligations				37,000,000	1,040,700,000
Total				214,000,000	1,043,200,000
Interest Expense				50,600,000	72,200,000	84,100,000
Repayments of Related Party Debt				37,000,000	90,800,000	80,300,000
Weighted average				1.43%	6.53%	7.30%
Aggregate maturities
2015				37,000,000
2019				177,000,000
Total				214,000,000	1,043,200,000
Consolidated Entity Excluding Consolidated Funds | Revolving credit facility
Borrowings and debt
Total third party obligations				177,000,000
Debt proceeds used for payment of related party dividend	175,000,000
Commitment fee (percentage)				0.25%
Maximum borrowing capacity	350,000,000
Ratio of third-party borrowings to trailing twelve months Adjusted EBITDA				0.8
Amount drawn under the facility	177,000,000
Consolidated Entity Excluding Consolidated Funds | Revolving credit facility | Minimum
Borrowings and debt
Commitment fee (percentage)	0.20%
Interest coverage ratio	4
Consolidated Entity Excluding Consolidated Funds | Revolving credit facility | Maximum
Borrowings and debt
Commitment fee (percentage)	0.50%
Ratio of third-party borrowings to trailing twelve months Adjusted EBITDA	3
Consolidated Entity Excluding Consolidated Funds | Revolving credit facility | LIBOR
Borrowings and debt
Variable rate margin (as a percent)				1.50%
Consolidated Entity Excluding Consolidated Funds | Revolving credit facility | Prime Rate
Borrowings and debt
Variable rate basis	prime rate
Consolidated Entity Excluding Consolidated Funds | Revolving credit facility | Prime Rate | Minimum
Borrowings and debt
Variable rate additional margin (as a percent)	0.25%
Consolidated Entity Excluding Consolidated Funds | Revolving credit facility | Prime Rate | Maximum
Borrowings and debt
Variable rate additional margin (as a percent)	1.00%
Consolidated Entity Excluding Consolidated Funds | Revolving credit facility | Federal Funds Effective Rate
Borrowings and debt
Variable rate margin (as a percent)	0.50%
Variable rate basis	federal funds effective rate
Consolidated Entity Excluding Consolidated Funds | Revolving credit facility | Federal Funds Effective Rate | Minimum
Borrowings and debt
Variable rate additional margin (as a percent)	0.25%
Consolidated Entity Excluding Consolidated Funds | Revolving credit facility | Federal Funds Effective Rate | Maximum
Borrowings and debt
Variable rate additional margin (as a percent)	1.00%
Consolidated Entity Excluding Consolidated Funds | Revolving credit facility | One, two, three or six months rate LIBOR | Minimum
Borrowings and debt
Variable rate margin (as a percent)	1.25%
Consolidated Entity Excluding Consolidated Funds | Revolving credit facility | One, two, three or six months rate LIBOR | Maximum
Borrowings and debt
Variable rate margin (as a percent)	2.00%
Consolidated Entity Excluding Consolidated Funds | Revolving credit facility | One Month Adjusted London Interbank Offered Rate LIBOR
Borrowings and debt
Variable rate margin (as a percent)	1.00%
Variable rate basis	one month Adjusted LIBO Rate
Consolidated Entity Excluding Consolidated Funds | Revolving credit facility | One Month Adjusted London Interbank Offered Rate LIBOR | Minimum
Borrowings and debt
Variable rate additional margin (as a percent)	0.25%
Consolidated Entity Excluding Consolidated Funds | Term loan two
Borrowings and debt
Total third party obligations					2,500,000
Interest rate (as a percent)					5.23%		5.23%
Debt issued												16,500,000
Installment payment							2,500,000	1,500,000	12,000,000	500,000
Consolidated Entity Excluding Consolidated Funds | Term loan two | Old Mutual plc
Borrowings and debt
Debt issued		37,000,000
Consolidated Entity Excluding Consolidated Funds | Related party credit facility
Borrowings and debt
Total related party obligations					140,700,000
Commitment fee (percentage)				0.50%
Consolidated Entity Excluding Consolidated Funds | Related party credit facility | Old Mutual plc
Borrowings and debt
Term of loan													5 years
Maximum borrowing capacity on related party debt													850,000,000	750,000,000
Extended maturity												12 months
Commitment fee (percentage)											1.95%	0.82%		0.50%
Repayments of Related Party Debt				140,700,000	90,800,000	50,300,000
Consolidated Entity Excluding Consolidated Funds | Related party credit facility | LIBOR
Borrowings and debt
Variable rate margin (as a percent)				5.58%
Variable rate basis					LIBOR
Consolidated Entity Excluding Consolidated Funds | Related party credit facility | LIBOR | Old Mutual plc
Borrowings and debt
Variable rate margin (as a percent)											5.58%	1.65%
Variable rate basis											LIBOR	LIBOR
Consolidated Entity Excluding Consolidated Funds | Term loan one
Borrowings and debt
Total related party obligations					900,000,000
Variable rate margin (as a percent)					6.34%
Consolidated Entity Excluding Consolidated Funds | Term loan one | Old Mutual plc
Borrowings and debt
Interest rate (as a percent)															6.34%
Debt issued															900,000,000
Consolidated Entity Excluding Consolidated Funds | Loan note one | Old Mutual plc
Borrowings and debt
Interest rate (as a percent)		3.00%
Debt issued		175,000,000
Consolidated Entity Excluding Consolidated Funds | Loan note two
Borrowings and debt
Total related party obligations				37,000,000
Interest rate (as a percent)				0.00%
Consolidated Entity Excluding Consolidated Funds | Loan note two | Old Mutual plc
Borrowings and debt
Term of loan		10 years
Consolidated Entity Excluding Consolidated Funds | Loan note two | Minimum | Old Mutual plc
Borrowings and debt
Installment payment		1,000,000
Consolidated Funds
Borrowings and debt
Total third party obligations				3,777,200,000	3,783,100,000
Total related party obligations				318,700,000	604,700,000
Total				4,095,900,000	4,387,800,000
Interest Expense				135,500,000	149,300,000	127,200,000
Fair value of borrowings				3,794,100,000	4,600,300,000
Aggregate maturities
2015				20,000,000
2016				444,300,000
2017				189,700,000
2018				75,000,000
2019				665,000,000
Thereafter				2,701,900,000
Total				4,095,900,000	4,387,800,000
Consolidated Funds | Promissory note
Borrowings and debt
Total related party obligations					265,000,000
Interest rate (as a percent)					4.00%											11.00%
Debt issued					269,000,000
Term of loan					10 years
Consolidated Funds | Shareholder loans and note interest
Borrowings and debt
Total related party obligations				318,700,000	339,700,000
Consolidated Funds | Shareholder loans and note interest | BBSW
Borrowings and debt
Variable rate margin (as a percent)				5.50%
Variable rate basis				BBSW*
Consolidated Funds | Term Loan B Tranche One
Borrowings and debt
Interest rate (as a percent)				5.93%
Debt issued				259,000,000
Increase to interest rate upon occurrence of certain events				0.25%
Consolidated Funds | Term Loan B Tranche Two
Borrowings and debt
Debt issued				2,300,000
Consolidated Funds | Term Loan B Tranche Two | LIBOR
Borrowings and debt
Variable rate margin (as a percent)				1.48%	1.61%
Consolidated Funds | Term loan A
Borrowings and debt
Total third party obligations				163,000,000	163,000,000
Interest rate in effect at period end - minimum (as a percent)				6.00%
Interest rate in effect at period end - maximum (as a percent)				6.26%
Interest rate -minimum (as a percent)				5.88%
Interest rate -maximum (as a percent)				6.14%
Installment payment				0
Number of Tranches				3
Increase to interest rate upon occurrence of certain events				0.13%
Consolidated Funds | Term loan B
Borrowings and debt
Total third party obligations				261,300,000	261,500,000
Installment payment				0
Consolidated Funds | Senior secured notes
Borrowings and debt
Total third party obligations				860,000,000	860,000,000
Interest rate -minimum (as a percent)				6.19%
Interest rate -maximum (as a percent)				6.38%
Debt issued				860,000,000	860,000,000
Number of Tranches				5	5
Increase to interest rate upon occurrence of certain events				0.25%
Consolidated Funds | Secured bank loan
Borrowings and debt
Total third party obligations				109,700,000	115,400,000
Debt issued				109,700,000	115,400,000
Consolidated Funds | Notes payable
Borrowings and debt
Total third party obligations				2,383,200,000	2,383,200,000
Debt issued				$2,383,200,000
Number of banks issuing letters of credit as security				4

Income_Taxes_Details

Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes
Net operating loss carryforwards utilized	$1,600,000	$33,800,000	$23,900,000
Accrued federal income taxes		0	0
Current:
Federal	41,600,000
State	5,100,000	4,500,000	-8,000,000
Foreign	1,300,000	500,000	600,000
Total current	48,000,000	5,000,000	-7,400,000
Deferred:
Federal	-37,400,000	12,000,000	20,600,000
State	500,000	-3,900,000	-10,800,000
Foreign	1,700,000	200,000	900,000
Total deferred	-35,200,000	8,300,000	10,700,000
Total tax expense	12,800,000	13,300,000	3,300,000
Income tax expense (benefits) from discontinued operations
Income tax expense (benefit) included in discontinued operations	1,000,000	5,200,000	-3,700,000
Income tax expense (benefit) on gain (loss) disposal of discontinued operations	$1,500,000	($2,300,000)	$7,700,000

Income_Taxes_Details_2

Income Taxes (Details 2) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of the difference between the Company's U.S. Federal statutory income tax rate and effective income tax rate for continuing operations
Tax at U.S. federal statutory income tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	-7.30%	-2.70%	-3.10%
Non-deductible expenses	1.60%	-0.10%
Interest expense	14.70%
Dividends from foreign subsidiaries	-6.60%		-0.50%
Parent company expense carve-out adjustment	-3.60%	-1.40%	-2.10%
IPO preparation costs			-0.30%
Adjustment to liabilities for uncertain tax positions	2.20%	1.30%	19.60%
Change in valuation allowance	34.90%	1.00%	2.50%
Effect of foreign operations	2.50%	0.70%	1.10%
Effect of changes in tax law, rates	-10.80%	-1.60%	-0.10%
Effect of income from non-controlling interest	-108.40%	-48.60%	-55.50%
Other	6.10%	0.50%	-3.70%
Effective income tax rate from continuing operations	-39.70%	-15.90%	-7.10%
Change in valuation allowance	$11.30
Foreign unremitted earnings indefinitely reinvested	$14.80

Income_Taxes_Details_3

Income Taxes (Details 3) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Interest expense	181.1	$193.30
Federal net operating loss	12.7	12.8
State net operating loss carry forwards	27.2	28.4
Investment partnerships	121	82.7
Foreign tax credit carry forwards	6.4	6.4
Intangible assets	2.5	3.4
Employee compensation	8.8	4.7
Other	4.5	8.8
Total deferred tax assets	364.2	340.5
Valuation allowance	-33.9	-45.9
Deferred tax assets, net of valuation allowance	330.3	294.6
Deferred tax liabilities:
Undistributed earnings of subsidiaries		0.4
Net deferred tax asset	330.3	294.2
Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	30.2
Federal | Minimum
Operating Loss Carryforwards [Line Items]
Expiration period of operating loss carryforwards	11 years
Federal | Maximum
Operating Loss Carryforwards [Line Items]
Expiration period of operating loss carryforwards	15 years
State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	482.2
State | Minimum
Operating Loss Carryforwards [Line Items]
Expiration period of operating loss carryforwards	1 year
State | Maximum
Operating Loss Carryforwards [Line Items]
Expiration period of operating loss carryforwards	15 years

Income_Taxes_Details_4

Income Taxes (Details 4) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of the change in gross unrecognized tax benefits
Balance as of January 1	$97.20	$106.20	$119.70
Additions based on tax positions of prior years		0.1	0.5
Reductions for tax provisions of prior years	-1.5	-6.9
Reductions related to lapses of statutes of limitations	-1.8	-2.2	-13.8
Settlements			-0.2
Balance as of December 31	93.9	97.2	106.2
Liability for unrecognized tax benefits that would affect the effective tax rate if recognized	93.2	94.4
Interest and penalties recognized in income tax provision	0	-0.4	-1.2
Accrued interest and penalties relating to unrecognized tax benefits	1.4	1.4	1.9
Amount of decrease to unrecognized tax benefits reasonably possible within next 12 months	0.6
Previously reported
Reconciliation of the change in gross unrecognized tax benefits
Interest and penalties recognized in income tax provision		-0.2	0.2
Accrued interest and penalties relating to unrecognized tax benefits		$4	$4.20

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2012
In Millions, unless otherwise specified
Operational commitments
Contingency accrual	$0
Maximum
Operational commitments
Commitments to invest with an Affiliate	30
Foreign tax contingency | Maximum
Operational commitments
Estimate of possible loss	9
Affiliate | Maximum
Operational commitments
Potential contingent acquisition payment obligations		$11

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net income attributable to controlling interests	$16.10	($8.40)	($55.60)	$4.10	($10.10)	($5.10)	($70)	($11.30)	$51.70	$25.70	$3
Denominator:
Weighted-average ordinary shares outstanding-basic									120,000,000	120,000,000	120,000,000
Weighted-average ordinary shares outstanding-diluted									120,000,000	120,000,000	120,000,000
Pro forma earnings per ordinary share attributable to controlling interests:
Basic (in dollars per share)									$0.43	$0.21	$0.03
Diluted (in dollars per share)									$0.43	$0.21	$0.03
Restricted shares
Denominator:
Weighted-average ordinary shares outstanding-basic										1,212,766

Employee_Benefits_Details

Employee Benefits (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Benefits
Voluntary deferral plan liability	$59.50	$51.20
Assets invested in defined contribution plans	59.7	51.4
Expenses in relation to qualified & non-qualified plans	$10.80	$8.70	$6.50

Equitybased_Compensation_Detai

Equity-based Compensation (Details) (USD $)	12 Months Ended			0 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Apr. 01, 2011	Dec. 31, 2007
Equity-based Compensation
Reclassification of modified equity-settled award	$3.60
Balance, end of period		42.3	86
Cash Settled Awards
Equity-based Compensation
Balance, beginning of period	47.3	86	65.8
Amortization and revaluation of granted awards	19.1	43.4	30
Reclassification of modified equity-settled award	3.6		0.9
Reclassification to profit-interests award		-1.7
Affiliate disposals	-2.4	-18
Repurchase by OMAM (cash settled)	-1.8	-67.4	-10.7
Balance, end of period	65.8	42.3	86
Amortization of unrecognized compensation expense
2015		1.7
2016		1.7
2017		0.9
Total		4.3
Class B interest
Equity-based Compensation
Reclassification of modified equity-settled award			0.9
Acadian Asset Management Plan | Class B interest
Equity-based Compensation
Reclassification of modified equity-settled award		0
Amortization of unrecognized compensation expense
Percentage of earnings participating employees are entitled to					28.57%
Fair value at grant date					42.5
Period of earnings on which multiple for redemption is based				12 months
Surrender-date fair value prior to modification				7.2
Excess of fair value of modified award over its pre-modification fair value				21.1
Award modification vesting period.				2 years
Fair value transferred from non-controlling interest to parent equity				$35.30

Equitybased_Compensation_Detai1

Equity-based Compensation (Details)	12 Months Ended													12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	Old Mutual Compensation Plans	Old Mutual Compensation Plans	Old Mutual Compensation Plans	Old Mutual Compensation Plans	Old Mutual Compensation Plans	Old Mutual Compensation Plans	IPO Incentive Plan	IPO Incentive Plan	IPO Incentive Plan	Options	Options	Options	Options	Options	Options	Options	Options	Restricted shares	Restricted shares	Restricted shares
	USD ($)	GBP (£)	USD ($)	GBP (£)	USD ($)	GBP (£)	USD ($)	USD ($)	USD ($)	An Affiliate Disposed	An Affiliate Disposed	Minimum	Maximum	Old Mutual Compensation Plans	Old Mutual Compensation Plans	Old Mutual Compensation Plans	Old Mutual Compensation Plans	Old Mutual Compensation Plans	Old Mutual Compensation Plans	Old Mutual Compensation Plans
												An Affiliate Disposed	An Affiliate Disposed	USD ($)	An Affiliate Disposed	An Affiliate Disposed	An Affiliate Disposed	USD ($)	USD ($)	USD ($)
												USD ($)	USD ($)		USD ($)	USD ($)	USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$4.50		$5		$2.90		$1	$3.80	$2.40
Income tax benefit	1.7		1.8		0.8		0.4	1.6	0.9
Options granted										249,821	93,410
Outstanding shares											437,999
Exercise price												$0.58	$2.55
Weighted average remaining contractual life											1 year 2 months 12 days
Expense classified within discontinued operations															0.2	0.1	0.1
Weighted average share at date of exercise															$3.30	$0.94
Weighted average share price at exercise															$1.44
Fair value at grant date														0.2		0.1
Number of shares
Outstanding at beginning of year	3,954,534	3,954,534	2,888,925	2,888,925	3,103,308	3,103,308
Granted during the year	3,576,379	3,576,379	1,996,967	1,996,967	1,682,389	1,682,389
Forfeited during the year	-10,711	-10,711	-64,778	-64,778
Exercised during the year	-878,217	-878,217	-543,708	-543,708	-1,882,278	-1,882,278
Expired during the year					-34,190	-34,190
Other transfers	-5,959,639	-5,959,639	-322,872	-322,872	19,696	19,696
Outstanding at end of year	682,346	682,346	3,954,534	3,954,534	2,888,925	2,888,925
Weighted-average exercise price
Outstanding at beginning of year	$2.85	£ 1.73	$2.30	£ 1.47	$1.63	£ 1.03
Granted during the year	$3.35	£ 2.03	$3.03	£ 1.94	$2.49	£ 1.57
Forfeited during the year	$3.35	£ 2.03	$2.36	£ 1.51
Exercised during the year	$2.39	£ 1.45	$1.95	£ 1.25	$1.40	£ 0.88
Expired during the year					$2	£ 1.31
Outstanding at end of year	$2.92	£ 1.77	$2.70	£ 1.73	$2.33	£ 1.47
Fair value of awards																		8.1	6.1	4.2
Unrecognized expense
Unrecognized expense							1.1
Expense to be recognized in 2015							0.5
Expense to be recognized in 2016							$0.50

Equitybased_Compensation_Detai2

Equity-based Compensation (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 08, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Trading days on which exchange is based	3 days
Old Mutual Compensation Plans
Number of shares
Outstanding at beginning of year	3,954,534	2,888,925	3,103,308
Granted during the year	3,576,379	1,996,967	1,682,389
Forfeited during the year	-10,711	-64,778
Exercised during the year	-878,217	-543,708	-1,882,278
Expired during the year			-34,190
Other transfers	-5,959,639	-322,872	19,696
Outstanding at end of year	682,346	3,954,534	2,888,925
Old Mutual Compensation Plans | OM Group UK
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equivalent number shares exchanged				5,914,981
OM Asset Management Equity Incentive Plan
Number of shares
Converted during the year	1,212,766
Forfeited during the year	-10,225
Other transfers	10,225
Outstanding at end of year	1,212,766
Weighted average grant date fair value per share
Outstanding at beginning of year	14
Converted during theyear	14
Forfeited during the year	15.46
Other transfers	15.46
Outstanding at end of year	14
OM Asset Management Equity Incentive Plan | OM Group UK
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equivalent number shares exchanged				1,212,766
Restricted shares | OM Asset Management Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Accumulated Other Comprehensive Income
Foreign currency translation	($20.40)	($17.90)	$1.20

Noncontrolling_interests_Detai

Non-controlling interests (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Noncontrolling Interests
Redeemable Noncontrolling Interest, Equity, Carrying Amount	$61.90	$403.30
Consolidated Entity Excluding Consolidated Funds
Noncontrolling Interests
Non-controlling interests	0	0.1	0.9
Net income attributable to non-controlling interests		0.1
Consolidated Funds
Noncontrolling Interests
Non-controlling interests	2,459	2,579.30
Net income attributable to non-controlling interests	-95.5	-122.3	-69.2
Redeemable Noncontrolling Interest, Equity, Carrying Amount	$61.90	$403.30

Funds_Derivatives_and_Hedging_1

Funds' Derivatives and Hedging (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Derivative fair values
Assets	$1	$4.10
Liabilities		4.2
Futures contracts | Not designated | Consolidated Funds
Derivative fair values
Number of open contracts	0
Interest rate swap | Not designated | Consolidated Funds
Derivative fair values
Average notional value	0.4	7.1
Interest rate swap | Other assets | Not designated | Consolidated Funds
Derivative fair values
Assets	0.4	1.4
Interest rate swap | Other liabilities | Not designated | Consolidated Funds
Derivative fair values
Liabilities		0.2
Foreign exchange contracts | Other assets | Not designated | Consolidated Funds
Derivative fair values
Assets	0.5	2.2
Foreign exchange contracts | Other liabilities | Not designated | Consolidated Funds
Derivative fair values
Liabilities		3.5
Foreign exchange contracts | Long | Not designated | Consolidated Funds
Derivative fair values
Average notional value	3	14
Foreign exchange contracts | Short | Not designated | Consolidated Funds
Derivative fair values
Average notional value	2.7	11.5
Warrants | Investments | Not designated | Consolidated Funds
Derivative fair values
Assets	0.1
Total return swap | Other assets | Not designated | Consolidated Funds
Derivative fair values
Assets		0.1
Total return swap | Other liabilities | Not designated | Consolidated Funds
Derivative fair values
Liabilities		0.1
Other derivatives | Other liabilities | Not designated | Consolidated Funds
Derivative fair values
Liabilities		0.4
Other derivatives | Investments | Not designated | Consolidated Funds
Derivative fair values
Assets		$0.40

Funds_Derivatives_and_Hedging_2

Funds' Derivatives and Hedging (Details 2) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative gains (losses)
Total Gains	$0.60	$2.60	$1.30
Total Losses	-0.7	-6.7
Foreign exchange contracts | Not designated | OMAM funds net gains (losses) | Consolidated Funds
Derivative gains (losses)
Realized gains	0.1		0.9
Realized losses		-0.1
Unrealized losses		-1.7
Change in unrealized appreciation	0.1		0.4
Change in unrealized depreciation		-4.9
Total return swap | Not designated | OMAM funds net gains (losses) | Consolidated Funds
Derivative gains (losses)
Realized losses	-0.3
Interest rate swap | Not designated | OMAM funds net gains (losses) | Consolidated Funds
Derivative gains (losses)
Unrealized gains		0.5
Unrealized losses	-0.4
Change in unrealized appreciation	0.4
Futures contracts | Not designated | OMAM funds net gains (losses) | Consolidated Funds
Derivative gains (losses)
Change in unrealized appreciation		0.4
Other derivatives | Not designated | OMAM funds net gains (losses) | Consolidated Funds
Derivative gains (losses)
Unrealized gains		1.1
Change in unrealized appreciation		$0.60

Discontinued_Operations_and_Re2

Discontinued Operations and Restructuring (Details) (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Discontinued Operations and Restructuring
Revenues	$38	$84.80	$137.60
Compensation expense	30.9	50.7	102.1
Depreciation	0.2	0.5	1.7
Other operating expenses	9.8	16.2	37.6
Amortization and impairment of goodwill & intangibles		0.1	32.7
Operating income (loss)	-2.9	17.3	-36.5
Net interest income (expense)	0.1		-0.2
Income (loss) before taxes	0	7.9	-30.7
Income taxes	1.1	5.2	-3.7
Discontinued net income (loss)	-1.1	2.7	-27
Gain (loss) on disposal, net of tax of $(1.5), $2.3, and $(7.7)	2.3	-2.1	10.8
Tax on gain (loss) on disposal	-1.5	2.3	-7.7
Total discontinued operations	1.2	0.6	-16.2
Attributable to non-controlling interests	4.7	-5.8	4.9
Attributable to controlling interests	-3.5	6.4	-21.1
Pro forma earnings (loss) per share (basic and diluted) attributable to controlling interests (in dollars per share)	($0.03)	$0.05	($0.18)
Impairment charges of discontinued operations			25.2
Gain (loss) on disposal before tax			18.5
Severance costs			0.3
Discontinued operation and restructuring liability rollforward
Beginning balance at January 1	8.6	11.1
Abandoned lease liability principle payments	-0.4	-0.7
Accrual of wind-up costs in relation to discontinued operation	0.3	2.8
Payment of wind-up costs in relation to discontinued operation	-2.6	-0.2
Adjustment to sub-lease arrangement on abandoned lease	1.2	0.6
Drawdowns on committed funding	-1.5	-5
Ending balance at December 31	5.6	8.6	11.1
Consolidated Funds
Discontinued Operations and Restructuring
Investment gain (loss)	$2.80	($9.40)	$6

Segment_Information_Details

Segment Information (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
									segment
Segment Information
Number of segments									1
Segment information
Total revenue	$266.50	$260	$260.40	$269.40	$248.30	$209.70	$247	$223.60	$1,056.30	$928.60	$703.50
Total operating expenses									1,123.50	1,028.10	766
Operating loss	-9.1	-18.2	-45.5	5.6	-29.1	-5.2	-51.4	-13.8	-67.2	-99.5	-62.5
Loss from continuing operations before taxes	19.2	-15.7	-44.1	8.4	-13.8	-2.2	-56.2	-11.6	-32.2	-83.8	-46.7
Tax on economic net income									12.8	13.3	3.3
Net income attributable to controlling interests	16.1	-8.4	-55.6	4.1	-10.1	-5.1	-70	-11.3	51.7	25.7	3
Operating segments | Segment providing investment management services and products to predominantly institutional clients
Segment information
Management fees									589.9	499.8	420.9
Performance fees									34.3	18.1	14.1
Other income, including equity-accounted subsidiaries									11.2	9.6	15.8
Total revenue									635.4	527.5	450.8
Fixed compensation & benefits									120.2	111.4	104
Selling, general and administrative expenses									94.6	76.5	71.1
Depreciation and amortization									6.1	4.9	5.7
Total operating expenses									220.9	192.8	180.8
Earnings before variable compensation									414.5	334.7	270
Variable compensation									169.8	153.8	121
Earnings after variable compensation									244.7	180.9	149
Affiliate key employee distributions									40.1	28.4	19.1
Operating loss									204.6	152.5	129.9
Net interest income									-0.5	0.5	1.4
Loss from continuing operations before taxes									204.1	153	131.3
Tax on economic net income									52.8	30.1	19
Net income attributable to controlling interests									$151.30	$122.90	$112.30
ENI operating margin before Affiliate key employee distributions									39.00%	34.00%	33.00%
ENI operating margin after Affiliate key employee distributions									32.00%	29.00%	29.00%

Segment_Information_Details_2

Segment Information (Details 2) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Economic Net Income to U.S. GAAP net income (loss) attributable to controlling interest and EBITDA
Net income (loss)	$16.10	($8.40)	($55.60)	$4.10	($10.10)	($5.10)	($70)	($11.30)	$51.70	$25.70	$3
Tax on economic net income									12.8	13.3	3.3
Operating segments | Segment providing investment management services and products to predominantly institutional clients
Reconciliation of Economic Net Income to U.S. GAAP net income (loss) attributable to controlling interest and EBITDA
Net income (loss)									151.3	122.9	112.3
Tax on economic net income									52.8	30.1	19
Reconciling items
Reconciliation of Economic Net Income to U.S. GAAP net income (loss) attributable to controlling interest and EBITDA
Non-cash notional parent corporate cost allocation									3.4	3.3	2.8
Intercompany interest expense									49.8	72.2	84
Co-investment (gain) loss									-2.6	-3	-1.2
Initial public offering costs											0.4
Non-cash key employee-owned equity and profit-interest revaluations									83	47.7	16.2
Amortization and impairment of goodwill and acquired intangible assets									0.1	0.1	1.8
Discontinued operations attributable to controlling interests									5.8	-6.3	21
ENI tax normalization									-6.7	1.2	-9
Tax on economic net income									-33.2	-18	-6.7
Purchase of additional ownership interest in an Affiliate									$31.60

Segment_Information_Details_3

Segment Information (Details 3) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Revenues included in Economic Net Income to U.S. GAAP Revenue
Revenues	$266.50	$260	$260.40	$269.40	$248.30	$209.70	$247	$223.60	$1,056.30	$928.60	$703.50
United States
Reconciliation of Revenues included in Economic Net Income to U.S. GAAP Revenue
Revenues									1,056.30	928.6	703.5
United States | Consolidated Funds
Reconciliation of Revenues included in Economic Net Income to U.S. GAAP Revenue
Revenues									430.5	408.8	268
Operating segments | Segment providing investment management services and products to predominantly institutional clients
Reconciliation of Revenues included in Economic Net Income to U.S. GAAP Revenue
Revenues									635.4	527.5	450.8
Operating segments | Segment providing investment management services and products to predominantly institutional clients | United States
Reconciliation of Revenues included in Economic Net Income to U.S. GAAP Revenue
Revenues									635.4	527.5	450.8
Reconciling items | United States
Reconciliation of Revenues included in Economic Net Income to U.S. GAAP Revenue
Income Loss From Equity Method Investments In Affiliates									($9.60)	($7.70)	($15.30)

Segment_Information_Details_4

Segment Information (Details 4) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Assets by geographical areas
Assets	$7,772.90	$8,551.80
Segment providing investment management services and products to predominantly institutional clients | Consolidated Entity Excluding Consolidated Funds
Assets by geographical areas
Assets	993.2	1,014.40
Segment providing investment management services and products to predominantly institutional clients | United Kingdom | Consolidated Entity Excluding Consolidated Funds
Assets by geographical areas
Assets		51.8
Segment providing investment management services and products to predominantly institutional clients | United States | Consolidated Entity Excluding Consolidated Funds
Assets by geographical areas
Assets	$993.20	$962.60

Selected_Quarterly_Financial_D2

Selected Quarterly Financial Data (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Selected Quarterly Financial Data
Revenues	$266.50	$260	$260.40	$269.40	$248.30	$209.70	$247	$223.60	$1,056.30	$928.60	$703.50
Operating income (loss)	-9.1	-18.2	-45.5	5.6	-29.1	-5.2	-51.4	-13.8	-67.2	-99.5	-62.5
Income (loss) from continuing operations before income taxes	19.2	-15.7	-44.1	8.4	-13.8	-2.2	-56.2	-11.6	-32.2	-83.8	-46.7
Net income (loss)	16.1	-8.4	-55.6	4.1	-10.1	-5.1	-70	-11.3	51.7	25.7	3
Net income (loss) attributable to controlling interests	$34.30	($1.70)	$8.80	$10.30	$7.10	$6.90	$5.50	$6.20
Basic and fully diluted earnings per share	$0.28	($0.01)	$0.08	$0.08	$0.06	$0.06	$0.04	$0.05
Basic and fully diluted shares outstanding (in millions)	120	120	120	120	120	120	120	120