Jones Lang LaSalle (JLL) 10-K 25 Feb 16 2015 Q4 Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 22, 2016	Jul. 01, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	JONES LANG LASALLE INC
Entity Central Index Key	1,037,976
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 7,705,853,898
Entity Common Stock, Shares Outstanding		45,085,160
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q4
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 216,583	$ 250,413
Trade receivables, net of allowances of $23,186 and $17,861	1,591,674	1,375,035
Notes and other receivables	267,307	181,377
Warehouse receivables	265,211	83,312
Prepaid expenses	77,753	64,963
Deferred tax assets, net	132,868	135,251
Other	99,411	27,825
Total current assets	2,650,807	2,118,176
Property and equipment, net of accumulated depreciation of $449,204 and $418,332	423,268	368,361
Goodwill, with indefinite useful lives	2,141,471	1,907,924
Identified intangibles, net of accumulated amortization of $139,023 and $124,920	227,185	38,841
Investments in real estate ventures, including $155,167 and $113,602 at fair value	311,487	297,142
Long-term receivables	135,181	85,749
Deferred tax assets, net	87,177	90,897
Deferred Compensation Plan Assets	134,253	111,234
Other	94,330	57,012
Total assets	6,205,159	5,075,336
Current liabilities:
Accounts payable and accrued liabilities	712,624	630,037
Accrued compensation	1,088,889	990,678
Short-term borrowings	49,217	19,623
Deferred tax liabilities, net	21,112	16,554
Deferred income	114,770	104,565
Deferred business acquisition obligations, current liabilities	54,675	49,259
Warehouse facilities	263,102	83,312
Minority Shareholder Redemption Liability, Current	0	11,158
Other	200,804	141,825
Total current liabilities	2,505,193	2,047,011
Noncurrent liabilities:
Credit facility	254,999	0
Long-term senior notes	275,000	275,000
Deferred tax liabilities, net	33,032	17,082
Deferred compensation	156,197	125,857
Deferred business acquisition obligations, noncurrent liabilities	42,860	68,848
Other	208,496	118,969
Total liabilities	3,475,777	2,652,767
Redeemable Noncontrolling Interest	11,083	13,449
Company shareholders' equity:
Common stock, $.01 par value per share, 100,000,000 shares authorized; 45,049,503 and 44,828,779 shares issued and outstanding	450	448
Additional paid-in capital	986,633	961,850
Retained earnings	2,044,224	1,631,145
Shares held in trust	(6,231)	(6,407)
Accumulated other comprehensive loss	(336,313)	(200,239)
Total Company shareholders' equity	2,688,763	2,386,797
Noncontrolling interest	29,536	22,323
Total equity	2,718,299	2,409,120
Total liabilities and equity	$ 6,205,159	$ 5,075,336

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets
Trade receivables, allowances	$ 23,186	$ 17,861
Property and equipment, accumulated depreciation	449,204	418,332
Identified intangibles, with finite useful lives, accumulated amortization	139,023	124,920
Investments in real estate ventures - fair value	$ 155,167	$ 113,602
Company shareholders' equity
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	45,049,503	44,828,779
Common stock, shares outstanding (in shares)	45,049,503	44,828,779

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Revenue	$ 5,965,671	$ 5,429,603	$ 4,461,591
Operating expenses:
Compensation and benefits	3,564,536	3,258,673	2,817,059
Operating, administrative and other	1,729,079	1,568,424	1,177,545
Depreciation and amortization	108,142	94,337	79,853
Restructuring and acquisition charges	34,116	42,505	18,315
Total operating expenses	5,435,873	4,963,939	4,092,772
Operating income	529,798	465,664	368,819
Interest expense, net of interest income	(28,127)	(28,321)	(34,718)
Equity earnings from real estate ventures	77,475	48,265	31,343
Income before income taxes and noncontrolling interest	579,146	485,608	365,444
Provision for income taxes	132,805	97,588	92,092
Net income	446,341	388,020	273,352
Net income attributable to noncontrolling interest	7,669	1,957	3,487
Net income attributable to the Company	438,672	386,063	269,865
Dividends on unvested common stock, net of tax benefit	314	314	409
Net income attributable to common shareholders	$ 438,358	$ 385,749	$ 269,456
Basic earnings per common share (in dollars per share)	$ 9.75	$ 8.63	$ 6.09
Basic weighted average shares outstanding (in shares)	44,940,042	44,684,482	44,258,878
Diluted earnings per common share (in dollars per share)	$ 9.65	$ 8.52	$ 5.98
Diluted weighted average shares outstanding (in shares)	45,414,898	45,260,563	45,072,120
Other comprehensive income (loss):
Net income attributable to the Company	$ 438,672	$ 386,063	$ 269,865
Change in pension liabilities, net of tax	27,583	(37,086)	19,171
Foreign currency translation adjustments	(163,657)	(137,951)	(53,319)
Comprehensive income attributable to the Company	$ 302,598	$ 211,026	$ 235,717

Consolidated Statement of Chang

Consolidated Statement of Change in Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Shares Held in Trust [Member]	Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Balances (in shares) at Dec. 31, 2012		44,054,042
Balances at Dec. 31, 2012	$ 1,959,256	$ 441	$ 932,255	$ 1,017,128	$ (7,587)	$ 8,946	$ 8,073
Increase (decrease) in shareholders' equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	273,352			269,865			3,487
Shares issued under stock compensation programs (in shares)		550,821
Shares issued under stock compensation programs	1,255	$ 5	1,250
Shares repurchased for payment of taxes on stock awards (in shares)		(156,905)
Shares repurchased for payment of taxes on stock awards	(14,277)	$ (2)	(14,275)
Tax adjustments due to vestings and exercises	3,579		3,579
Amortization of stock compensation	22,703		22,703
Shares held in trust	(465)				(465)
Dividends paid	(20,026)			(20,026)
Change in pension liabilities, net of tax	19,171					19,171
Foreign currency translation adjustments	(53,319)					(53,319)
Increase (Decrease) in amount attributable to noncontrolling interest	(420)						(420)
Balances (in shares) at Dec. 31, 2013		44,447,958
Balances at Dec. 31, 2013	2,190,809	$ 444	945,512	1,266,967	(8,052)	(25,202)	11,140
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	1,187
Increase (decrease) in shareholders' equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	386,833			386,063			770
Shares issued under stock compensation programs (in shares)		511,508
Shares issued under stock compensation programs	2,393	$ 5	2,388
Shares repurchased for payment of taxes on stock awards (in shares)		(130,687)
Shares repurchased for payment of taxes on stock awards	(15,954)	$ (1)	(15,953)
Tax adjustments due to vestings and exercises	9,661		9,661
Amortization of stock compensation	20,242		20,242
Shares held in trust	1,645				1,645
Dividends paid	(21,885)			(21,885)
Change in pension liabilities, net of tax	(37,086)					(37,086)
Foreign currency translation adjustments	(137,951)					(137,951)
Increase (Decrease) in amount attributable to noncontrolling interest	10,413						10,413
Balances (in shares) at Dec. 31, 2014		44,828,779
Balances at Dec. 31, 2014	2,409,120	$ 448	961,850	1,631,145	(6,407)	(200,239)	22,323
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	1,560
Increase (decrease) in shareholders' equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	444,781			438,672			6,109
Shares issued under stock compensation programs (in shares)		280,689
Shares issued under stock compensation programs	5,184	$ 3	5,181
Shares repurchased for payment of taxes on stock awards (in shares)		(59,965)
Shares repurchased for payment of taxes on stock awards	(10,092)	$ (1)	(10,091)
Tax adjustments due to vestings and exercises	6,811		6,811
Amortization of stock compensation	22,705		22,705
Shares held in trust	176				176
Dividends paid	(25,593)			(25,593)
Change in pension liabilities, net of tax	27,583					27,583
Foreign currency translation adjustments	(163,657)					(163,657)
Increase (Decrease) in amount attributable to noncontrolling interest	1,104						1,104
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	177		177
Balances (in shares) at Dec. 31, 2015		45,049,503
Balances at Dec. 31, 2015	$ 2,718,299	$ 450	$ 986,633	$ 2,044,224	$ (6,231)	$ (336,313)	$ 29,536

Consolidated Statement of Chan6

Consolidated Statement of Change in Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]
Common Stock, Dividends, Per Share, Declared	$ 0.56	$ 0.48	$ 0.44

Consolidated Statements of Cash

Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Cash flows used for operating activities:
Net income	$ 446,341	$ 388,020	$ 273,352
Reconciliation of net income to net cash provided by (used in) operating activities:
Depreciation and amortization	108,142	94,337	79,853
Equity in earnings from real estate ventures	(77,475)	(48,265)	(31,343)
Gain on sale of assets	(701)	3,065	(2,555)
Distributions of earnings from real estate ventures	51,215	19,521	13,672
Provision for loss on receivables and other assets	14,502	8,201	8,715
Amortization of deferred compensation	22,705	20,242	22,703
Accretion of interest on deferred business acquisition obligations	2,943	5,260	7,837
Amortization of debt issuance costs	4,111	3,626	4,437
Change in:
Receivables	(400,762)	(264,025)	(267,550)
Prepaid expenses and other assets	(44,852)	(48,824)	(45,014)
Deferred tax assets, net	3,407	19,813	28,058
Excess tax benefit from share-based payment arrangements	(6,811)	(9,661)	(3,579)
Accounts payable, accrued liabilities and accrued compensation	253,004	307,551	206,649
Net cash provided by operating activities	375,769	498,861	295,235
Cash flows used for investing activities:
Net capital additions - property and equipment	(149,076)	(156,927)	(110,684)
Proceeds from Sales of Assets, Investing Activities	7,377	1,207	13,604
Business acquisitions	(391,594)	(38,196)	(57,544)
Capital contributions and advances to real estate ventures	(47,627)	(56,434)	(37,217)
Distributions, repayments of advances and sale of investments	49,237	62,412	27,629
Increase (Decrease) in Restricted Cash	(52,932)	0	0
Net cash used in investing activities	(584,615)	(187,938)	(164,212)
Cash flows from financing activities:
Proceeds from borrowings under credit facilities	2,173,000	1,664,000	1,957,791
Repayments of borrowings under credit facilities	(1,889,209)	(1,827,801)	(1,979,500)
Payment of deferred business acquisition obligations	(51,808)	(39,344)	(72,482)
Debt issuance costs	(7,319)	0	(4,614)
Shares repurchased for payment of employee taxes on stock awards	(10,092)	(15,954)	(14,277)
Excess tax adjustment from share-based payment arrangements	6,811	9,661	3,579
Common stock issued under option and stock purchase programs	5,184	2,393	1,255
Payment of dividends	(25,593)	(21,885)	(20,026)
Capital lease payments	(4,107)	(4,191)	0
Other loan proceeds, net	(3,797)	18,725	940
Noncontrolling interest contributions (distributions), net	(1,503)	11,367	(1,054)
Net cash used in financing activities	191,567	(203,029)	(128,388)
Effect of Exchange Rate on Cash and Cash Equivalents	(16,551)	(10,207)	(2,068)
Net increase (decrease) in cash and cash equivalents	(33,830)	97,687	567
Cash and cash equivalents, beginning of period	250,413	152,726	152,159
Cash and cash equivalents, end of period	216,583	250,413	152,726
Cash paid during the period for:
Interest	(21,700)	(20,160)	(22,850)
Income taxes, net of refunds	(155,566)	(88,459)	(84,951)
Non-cash investing activities
Business Combination, Consideration Transferred	105,091	10,296	9,215
Capital Lease Obligations Incurred	6,720	21,190	0
Non-cash financing activities:
Deferred business acquisition obligations	23,131	21,486	13,195
Redeemable Noncontrolling Interest, Acquisition Date Fair Value	$ 0	$ 14,186	$ 0

Organization

Organization	12 Months Ended
	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	1. ORGANIZATION Jones Lang LaSalle Incorporated ("Jones Lang LaSalle," which we may refer to as "JLL," "we," "us," "our," the "Company" or the "Firm") was incorporated in 1997. We have corporate offices worldwide with approximately 61,500 employees, including 32,700 employees whose costs are reimbursed by our clients. We provide comprehensive integrated real estate and investment management expertise on a local, regional and global level to owner, occupier and investor clients. We are an industry leader in property and corporate facility management services, with a portfolio of approximately 4.0 billion square feet worldwide. LaSalle Investment Management ("LaSalle"), a member of the Jones Lang LaSalle group, is one of the world's largest and most diversified real estate investment management firms, with approximately $56.4 billion of assets under management (unaudited). The following table shows the revenue for the major product categories into which we group these services. Year Ended December 31, ($ in millions) 2015 2014 2013 Real Estate Services: Leasing $ 1,669.5 1,540.0 1,321.7 Capital Markets & Hotels 955.8 822.9 716.1 Property & Facility Management 1,557.4 1,523.7 1,199.5 Project & Development Services 882.1 709.3 555.4 Advisory, Consulting and Other 503.9 465.6 414.2 LaSalle Investment Management 397.0 368.1 254.7 Total revenue $ 5,965.7 5,429.6 4,461.6 Individual regions and markets focus on different property types, depending on local requirements and market conditions. We work for a broad range of clients that represent a wide variety of industries and are based in markets throughout the world. Our clients vary greatly in size and include for-profit and not-for-profit entities of all kinds, public-private partnerships and governmental (public sector) entities. Increasingly, we are offering services to smaller middle-market companies looking to outsource real estate services. We provide real estate investment management services on a global basis for both public and private assets through our LaSalle segment. Our integrated global business model, industry-leading research capabilities, client relationship management focus, consistent worldwide service delivery and strong brand are attributes that enhance our services.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Principles of Consolidation Our Consolidated Financial Statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("U.S. GAAP") and include the accounts of JLL and its majority-owned and controlled subsidiaries. All intercompany balances and transactions have been eliminated. Investments in real estate ventures over which we exercise significant influence, but do not control, are accounted for either under the equity method or at fair value. When applying principles of consolidation, we begin by determining whether an investee entity is a variable interest entity ("VIE") or a voting interest entity. U.S. GAAP draws a distinction between voting interest entities, which are embodied by common and traditional corporate and partnership structures, and VIEs, broadly defined as entities for which control is achieved through means other than voting rights. For voting interest entities, the interest holder with control through majority ownership and majority voting rights consolidates the entity. For VIEs, determination of the "primary beneficiary" drives the accounting. We identify the primary beneficiary of a VIE as the enterprise that has both (1) the power to direct the activities of the VIE that most significantly impact the entity's economic performance and (2) the obligation to absorb losses or receive benefits of the VIE that could potentially be significant to the VIE. We perform this analysis as of the inception of our investment and upon the occurrence of a reconsideration event. When we determine we are the primary beneficiary of a VIE, we consolidate the VIE; when we determine we are not the primary beneficiary of the VIE, we account for our investment in the VIE under the equity method or at fair value. If an entity is not a VIE, but is a limited partnership or similar entity, we apply guidance related to investments in joint ventures, and consider rights held by limited partners which may preclude consolidation by a sole general partner. The assessment of limited partners' rights and their impact on the presumption of control of the limited partnership by the sole general partner should be made when an investor becomes the general partner, and reassessed if (1) there is a change to the terms or in the exercisability of the rights of the limited partners, (2) the general partner increases or decreases its ownership of limited partnership interests, or (3) there is an increase or decrease in the number of outstanding limited partnership interests. Our determination of the appropriate accounting method to apply for all other investments is based on the level of influence we have in the underlying entity. When we have an asset advisory contract with a real estate limited partnership, the combination of our limited partner interest and the advisory agreement generally provides us with significant influence over such real estate limited partnership. Accordingly, we account for such investments either under the equity method or at fair value. We eliminate transactions with such subsidiaries to the extent of our ownership in such subsidiaries. For less-than-wholly-owned consolidated subsidiaries, noncontrolling interest is the portion of equity not attributable, directly or indirectly, to the Company. The Company evaluates whether noncontrolling interests possess any redemption features outside of the Company's control. If such features are determined to exist, the noncontrolling interests are presented outside of permanent equity on our Consolidated Balance Sheets within Redeemable noncontrolling interest. Redeemable noncontrolling interests are adjusted to the greater of their fair value or carrying value at each balance sheet date through a charge to Additional paid-in capital, if necessary. If classification and presentation outside of permanent equity is not considered necessary, noncontrolling interests are presented as a component of permanent equity on our Consolidated Balance Sheets. Within our Consolidated Statements of Comprehensive Income, revenues, expenses and net income (loss) from less-than-wholly-owned consolidated subsidiaries are reported at the consolidated amounts, including both the amounts attributable to the Company and noncontrolling interests, and the income or loss attributable to the noncontrolling interest holders is reflected in Net income attributable to noncontrolling interest. Changes in amounts attributable to noncontrolling interests are reflected in the Consolidated Statements of Changes in Equity. Changes in amounts attributable to redeemable noncontrolling interests are presented in the following table. ($ in millions) Redeemable noncontrolling interests as of January 1, 2015 $ 13.4 Acquisition of redeemable noncontrolling interest (1) (2.8 ) Net income 1.6 Impact of exchange rate movements (1.1 ) Redeemable noncontrolling interests as of December 31, 2015 $ 11.1 (1) Reflects our redemption of a portion of the redeemable noncontrolling interest related to our 2014 acquisition of Tenzing AB and includes $0.2 million representing the difference between the redemption value and the carrying value of the acquired interest. Use of Estimates The preparation of our Consolidated Financial Statements in conformity U.S. GAAP requires us to make estimates and assumptions about future events that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the dates of the financial statements and the reported amounts of revenue and expenses during the reporting periods. Such estimates include the value and allocation of purchase consideration, valuation of accounts receivable, investments in real estate ventures, goodwill, intangible assets, other long-lived assets, legal contingencies, assumptions used in the calculation of income taxes, incentive compensation, self-insurance program liabilities, and retirement and other post-employment benefits, among others. These estimates and assumptions are based on management's best estimate and judgment. We evaluate these estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment, which we believe to be reasonable under the circumstances. We adjust such estimates and assumptions when facts and circumstances dictate. Market factors, such as illiquid credit markets, volatile equity markets and foreign currency fluctuations can increase the uncertainty in such estimates and assumptions. Because future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in those estimates resulting from continuing changes in the economic environment will be reflected in the financial statements in future periods. Although actual amounts will likely differ from such estimated amounts, we believe such differences are not likely to be material. Revenue Recognition We earn revenue from the following principal sources: • Transaction commissions; • Advisory and management fees; • Incentive fees; • Project and development management fees; and • Construction management fees. We recognize transaction commissions related to leasing services and capital markets services as revenue when we provide the related services unless future contingencies exist. Advisory and management fees related to property and facility management services, valuation services, corporate property services, consulting services and investment management are recognized in the period in which we perform the related services. We recognize incentive fees in the period earned, based on the performance of funds' investments, contractual benchmarks and other contractual formulas. If future contingencies exist, we defer recognition of the related revenue until the respective contingencies have been satisfied. We recognize project and development management and construction management fees by applying the percentage of completion method of accounting. The costs incurred to total estimated costs method is used to determine the extent of progress towards completion. Gross and Net Accounting We follow the guidance of the Financial Accounting Standards Board's ("FASB's") Accounting Standards Codification ("ASC") 605-45, Principal and Agent Considerations , when accounting for reimbursements received from clients. In certain of our businesses, primarily those involving management services, our clients reimburse us for expenses incurred on their behalf. We base the treatment of reimbursable expenses for financial reporting purposes upon the fee structure of the underlying contract. Accordingly, we report a contract that provides for fixed fees, fully inclusive of all personnel and other recoverable expenses, on a gross basis. When accounting on a gross basis, our reported revenue comprises the entire amount billed to our client and our reported expenses include all costs associated with the client. Certain contractual arrangements in our project and development services, including fit-out business activities and our facility management services, tend to have characteristics that result in accounting on a gross basis. In Note 3, Business Segments, for client assignments in property and facility management and in project and development services accounted for on a gross basis, we identify the reimbursable gross contract costs, including vendor and subcontractor costs ("gross contract costs"), and present separately their impact on both revenue and operating expense in our Real Estate Services ("RES") segments. We exclude these gross contract costs from revenue and operating expenses in determining "fee revenue" and "fee-based operating expenses" in our segment presentation. We account for a contract on a net basis when the fee structure is comprised of at least two distinct elements, namely (1) a fixed management fee and (2) a separate component that allows for scheduled reimbursable personnel costs or other expenses to be billed directly to the client. When accounting on a net basis, we include the fixed management fee in reported revenue and net the reimbursement against expenses. We base this accounting on the following factors, which define us as an agent rather than a principal: • The property owner or client, with ultimate approval rights relating to the employment and compensation of on-site personnel, and bearing all of the economic costs of such personnel, is determined to be the primary obligor in the arrangement; • Reimbursement to JLL is generally completed simultaneously with payment of payroll or soon thereafter; • The property owner is contractually obligated to fund all operating costs of the property from existing cash flow or direct funding from its building operating account and JLL bears little or no credit risk; and • JLL generally earns little to no margin on the reimbursement aspect of the arrangement, obtaining reimbursement only for actual costs incurred. We account for the majority of our service contracts on a net basis. The presentation of expenses pursuant to these arrangements under either a gross or net basis has no impact on operating income, net income or cash flows. Contracts accounted for on a gross basis resulted in certain reimbursable costs reflected in both revenue and operating expenses (gross contract costs) of $801.3 million , $727.9 million , and $434.8 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. Cash and Cash Equivalents We consider all highly-liquid investments purchased with maturities of less than three months to be cash equivalents. The carrying amount of cash equivalents approximates fair value due to the short-term maturity of these investments. Financing Receivables We account for Trade receivables, Notes and other receivables, Long-term receivables and Warehouse receivables as financing receivables. Trade Receivables Pursuant to contractual arrangements, Trade receivables, net of allowances include unbilled amounts of $374.6 million and $339.1 million as of December 31, 2015 and 2014 , respectively. We estimate the allowance necessary to provide for uncollectible accounts receivable. The estimate includes specific amounts for which payment has become unlikely. We also base this estimate on historical experience combined with a review of current developments and client credit quality. The process by which we calculate the allowance begins with the individual business units where specific uncertain accounts are identified and reserved as part of an overall reserve that is formulaic and driven by the age profile of the receivables and our historical experience. We then review these allowances on a quarterly basis to ensure they are appropriate. The following table details the changes in the allowance for uncollectible receivables. ($ in millions) 2015 2014 2013 Allowance as of January 1, $ 17.9 18.8 19.5 Charged to income 14.5 8.2 8.7 Write-off of uncollectible receivables (8.7 ) (7.8 ) (8.5 ) Reserves acquired from acquisitions 0.3 0.9 — Impact of exchange rate movements and other (0.8 ) (2.2 ) (0.9 ) Allowance as of December 31, $ 23.2 17.9 18.8 Notes and Other Receivables and Long-Term Receivables We make ongoing assessments of the collectability of outstanding Notes and other receivables and Long-term receivables, considering both objective and subjective factors such as the age profile of outstanding balances, the contractual terms of repayment and credit quality. Aspects of credit quality considered in our assessments of collectability include historical experience, current developments and the status of our broader business relationship with the obligor. We record an allowance against the outstanding balance when our assessments result in a determination that payment has become unlikely. After all collection efforts have been exhausted by management, the outstanding balance considered uncollectible is written off against the reserve. Historically, credit quality deterioration to the point of impairment or non-performance in our Notes and other receivables and Long-term receivables has been limited and has not had a material impact on our Consolidated Financial Statements. Warehouse Receivables We originate mortgages upon receiving contractual purchase commitments from government-sponsored enterprises ("GSEs") such as the Federal National Mortgage Association ( Fannie Mae ), the Government National Mortgage Association ( Ginnie Mae ), and the Federal Home Loan Mortgage Corporation ( Freddie Mac ). Loans (hereinafter also referred to as Warehouse receivables) are generally funded by our warehouse facilities at prevailing market rates and repaid within a one-month period when the GSEs buy the loans, while we retain the servicing rights. We carry Warehouse receivables at the lower of cost or fair value based on the commitment price. Historically, we have not experienced any credit quality deterioration or balances considered uncollectible with respect to our warehouse receivables. Upon surrender of control over the warehouse receivables, we account for the transfer as a sale. Mortgage Servicing Rights We retain certain servicing rights in connection with the origination and sale of mortgage loans. We record mortgage servicing rights based on the fair value of these rights on the date the loans are sold, resulting in net gains, which we record as Revenue in our Consolidated Statements of Comprehensive Income. As of December 31, 2015 and 2014 , we had $163.0 million and $5.8 million , respectively, of mortgage servicing rights carried at the lower of amortized cost or fair value in Identified intangibles on our Consolidated Balance Sheets. The increase in the balance was primarily the result of a business acquisition during 2015. We amortize servicing rights in proportion to and over the estimated period that net servicing income is projected to be received. We evaluate mortgage servicing assets for impairment on an annual basis, or more frequently if circumstances or events indicate a change in fair value. There have been no instances of impairment during all periods presented. Mortgage servicing rights do not actively trade in an open market with readily available observable prices; therefore, if necessary, the fair value of these rights would be determined based on certain assumptions and judgments that are Level 3 within the fair value hierarchy, including the estimation of the present value of future cash flows to be realized from servicing the underlying mortgages. Restricted Cash Restricted cash primarily consists of cash amounts set aside to satisfy legal or contractual requirements arising in the normal course of business. We are restricted in our ability to withdraw these funds other than for their specified use. Restricted cash of $75.6 million was included in Other current assets within our Consolidated Balance Sheet as of December 31, 2015 . As of December 31, 2014 , our restricted cash balance was immaterial. Property and Equipment We record property and equipment at cost and depreciate these assets over their relevant useful lives. We capitalize certain direct costs relating to internal-use software development when incurred during the application development phase. We evaluate property and equipment for impairment whenever events or circumstances indicate the carrying value of an asset group may not be recoverable. We record an impairment loss to the extent the carrying value exceeds the estimated fair value. We did not recognize any significant impairment losses related to property and equipment during the years ended December 31, 2015 , 2014 or 2013 . We calculate depreciation and amortization on property and equipment for financial reporting purposes by using the straight-line method based on the estimated useful lives of our assets. Depreciation and amortization expense related to property and equipment for the years ended December 31, 2015 , 2014 and 2013 was $97.2 million , $84.2 million , and $71.0 million , respectively. The following table shows the gross value of major asset categories and the standard depreciable lives for each of these asset categories. December 31, ($ in millions) 2015 2014 Depreciable Life Furniture, fixtures and equipment $ 82.8 90.9 2 to 13 years Computer equipment and software 510.6 429.8 1 to 10 years Leasehold improvements 209.3 197.7 1 to 20 years Automobiles and other 69.8 68.3 4 to 30 years Total 872.5 786.7 Total accumulated depreciation 449.2 418.3 Net property and equipment $ 423.3 368.4 Business Combinations, Goodwill and Other Intangible Assets We have historically grown, in part, through a series of acquisitions. Consistent with the services nature of the businesses we have acquired, we have recorded significant goodwill and intangible assets resulting from these acquisitions. These intangible assets are primarily comprised of management contracts and customer backlog we acquired as part of these acquisitions and amortize over their estimated useful lives. We evaluate goodwill for impairment at least annually. ASC Topic 350, Intangibles-Goodwill and Other , permits an entity to first assess qualitative factors to determine whether it is more likely than not the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test. We define our four reporting units as the three geographic regions of RES: Americas RES; Europe, Middle East and Africa ("EMEA") RES; and Asia Pacific RES, and LaSalle. We have considered both qualitative and quantitative factors with respect to the performance of our annual impairment test of goodwill and determined the fair value of our reporting units to be substantially in excess of the carrying value, primarily considering (1) our market capitalization in relation to the aggregate carrying value of our net assets, (2) our overall financial performance during the year at both the reporting unit and consolidated reporting levels, and (3) near and longer-term forecasts of operating income and cash flows generated by our reporting units in relation to the carrying values of the net assets of each reporting unit. In addition to our annual impairment evaluation, we evaluate whether events or circumstances have occurred in the period subsequent to our annual impairment testing that indicate it is more likely than not an impairment loss has occurred. It is possible our determination that goodwill for a reporting unit is not impaired could change in the future if current economic conditions deteriorate. We will continue to monitor the relationship between the Company's market capitalization and carrying value, as well as the ability of our reporting units to deliver current and projected EBITDA and cash flows sufficient to support the carrying values of the net assets of their respective businesses. We evaluate our Identified intangibles for impairment annually or if other events or circumstances indicate the carrying value may be impaired. See Note 4 for additional information on goodwill and other intangible assets. Investments in Real Estate Ventures We invest in certain ventures that primarily own and operate commercial real estate across a wide array of sectors including retail, residential and office on a global basis. Historically, these investments have primarily been co-investments in funds our LaSalle business establishes in the ordinary course of business for its clients. These investments take the form of ownership interests generally ranging from less than 1% to 15% of the respective ventures and based upon investment-specific objectives, are typically formed with anticipated five to nine year investment periods. During the course of investment periods, in many instances the terms of the underlying investment agreements limit the transferability of the Company's ownership interests to distinct events or circumstances, the timing or existence of which cannot be estimated. When in place, such restrictions are a result of the Company's role beyond that of a passive investor, which generally means an advisory or management responsibility on behalf of the other investors who are typically clients of our LaSalle business. We primarily account for these investments under the equity method, however, as further discussed below, we report certain of our investments at fair value utilizing information provided by investees. For real estate limited partnerships in which the Company is a general partner, the entities are generally well-capitalized and grant the limited partners substantive participating rights, such as the right to replace the general partner without cause, to dissolve or liquidate the partnership, to approve the sale or refinancing of the principal partnership assets, or to approve the acquisition of principal partnership assets. We generally account for such general partner interests under the equity method or at fair value. For limited partnerships in which the Company is a limited partner, the Company has concluded it does not have a controlling interest in these limited partnerships. When we have an asset advisory contract with the limited partnership, the combination of our limited partner interest and the advisory agreement generally provides us with significant influence over the real estate limited partnership venture. Accordingly, we account for such investments under the equity method or at fair value. For investments in real estate ventures accounted for under the equity method, we maintain an investment account that is (1) increased by contributions made and by our share of net income earned by the real estate ventures, and (2) decreased by distributions received and by our share of net losses realized by the real estate ventures. Our share of each real estate venture's net income or loss, including gains and losses from capital transactions, is reflected in our Consolidated Statements of Comprehensive Income as Equity earnings from real estate ventures. See "Principles of Consolidation" above for additional discussion of the accounting for our co-investments. We review our investments in real estate ventures, except those investments otherwise reported at fair value, for indications of whether we may not be able to recover the carrying value of our investments and whether our investments are other than temporarily impaired. When events or changes in circumstances indicate the carrying amount of one of our investments may be other than temporarily impaired, we consider the likelihood of recoverability of the carrying amount of our investment as well as the estimated fair value and record an impairment charge as applicable. We consider a number of factors, including our share of co-investment cash flows and the fair value of our co-investments, in determining whether or not our investment is other than temporarily impaired. For investments in real estate ventures reported at fair value, we maintain an investment account that is increased or decreased each reporting period by the difference between the fair value of the investment and the carrying value as of the balance sheet date. These fair value adjustments are reflected as gains or losses in our Consolidated Statements of Comprehensive Income within Equity earnings from real estate ventures. The fair value of these investments as of the balance sheet date is determined generally using net asset value ("NAV") per share (or its equivalent), a Level 3 input in the fair value hierarchy, provided by the investee. Refer to Note 5 and Note 9 for additional information regarding investments reported at fair value. We report Equity earnings from real estate ventures in the Consolidated Statements of Comprehensive Income after Operating income. However, for segment reporting we reflect Equity earnings (losses) from real estate ventures as a component of revenue. See Note 3 for Equity earnings (losses) reflected within segment revenue, as well as discussion of how the Chief Operating Decision Maker (as defined in Note 3) measures segment results with Equity earnings (losses) included in segment revenue. See Note 5 for additional information on investments in real estate ventures. Stock-Based Compensation Stock-based compensation in the form of restricted stock units is a significant element of our compensation programs. We determine the fair value of restricted stock units based on the market price of the Company's common stock on the grant date and amortize it on a straight-line basis over the associated vesting period for each separately vesting portion of an award. We reduce stock-based compensation expense for estimated forfeitures each period and adjust expense accordingly upon vesting or actual forfeitures. We also have a "noncompensatory" Employee Stock Purchase Plan ("ESPP") for U.S. employees and a Jones Lang LaSalle Savings Related Share Option Plan ("Save As You Earn" or "SAYE") for U.K. employees. The fair value of options granted under the SAYE plan are determined on the grant date and amortized over the associated vesting period. See Note 6 for additional information on our stock compensation plans. Income Taxes We account for income taxes under the asset and liability method. We recognize deferred tax assets and liabilities for the expected future tax consequences of events that have been included in our financial statements or tax returns. Under this method, we determine deferred tax assets and liabilities based on the differences between the financial reporting and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. An increase or decrease in a deferred tax asset or liability that results from a change in circumstances, and that causes a change in our judgment about expected future tax consequences of events, would be included in the tax provision when the changes in circumstances and our judgment occurs. Deferred income taxes also reflect the impact of operating loss and tax credit carryforwards. A valuation allowance is established if we believe it is more likely than not all or some portion of a deferred tax asset will not be realized. An increase or decrease in a valuation allowance that results from a change in circumstances, and that causes a change in our judgment about the ability to realize the related deferred tax asset, would be included in the tax provision when the changes in circumstances and our judgment occurs. See Note 8 for additional information on income taxes. Derivatives and Hedging Activities We do not enter into derivative financial instruments for trading or speculative purposes. However, in the normal course of business, we do use derivative financial instruments in the form of foreign currency forward contracts to manage our foreign currency exchange rate risk. We currently do not use hedge accounting for these contracts, which are marked-to-market each period with changes in unrealized gains or losses recognized in earnings and offset by foreign currency gains and losses on associated intercompany loans and other foreign currency balances. We include the gains and losses on these forward foreign currency exchange contracts as a component of our overall net foreign currency gains and losses included in Operating, administrative and other expense. The revaluations of our foreign currency forward contracts resulted in net losses of $11.7 million , $7.7 million and $0.1 million , for the years ended December 31, 2015 , 2014 and 2013 , respectively. Gains and losses from the revaluation of these contracts are recognized as a component of Operating, administrative and other expense and are offset by the gains and losses recognized on the revaluation of intercompany loans and other foreign currency balances such that the impact to net income was not significant for the three years ended December 31, 2015 . We have considered the counterparty credit risk related to these forward foreign currency exchange contracts and do not deem any counterparty credit risk to be material as of December 31, 2015 . See Note 9 for additional information on derivative financial instruments. Foreign Currency Translation We prepare the financial statements of our subsidiaries located outside the U.S. using local currency as the functional currency. The assets and liabilities of these subsidiaries are translated to U.S. dollars at the rates of exchange at the balance sheet date with the resulting translation adjustments included as a separate component of equity in the Consolidated Balance Sheets (Accumulated other comprehensive loss) and in the Consolidated Statements of Comprehensive Income (Other comprehensive income-foreign currency translation adjustments). See Note 15 for additional information on the components of Accumulated other comprehensive loss. Income and expenses are translated at the average monthly rates of exchange. We include gains and losses from foreign currency transactions in net earnings as a component of Operating, administrative and other expense. Net foreign currency losses were $2.0 million , $8.5 million , and $3.9 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. The effect of currency exchange rate changes on Cash and cash equivalents is presented as a separate caption in the Consolidated Statements of Cash Flows. Cash Held for Others We manage significant amounts of cash and cash equivalents in our role as agent for certain of our investment and property management clients. We do not include such amounts in our Consolidated Balance Sheets. Taxes Collected from Clients and Remitted to Governmental Authorities We account for tax assessed by a governmental authority that is based on a revenue or transaction value (i.e., sales, use, and value added taxes) on a net basis, excluded from revenue, and recorded as current liabilities until paid. Commitments and Contingencies We are subject to various claims and contingencies related to lawsuits and taxes as well as commitments under contractual obligations. Many of these claims are covered under our current insurance programs, subject to deductibles. We recognize the liability associated with a loss contingency when a loss is probable and estimable. See Note 13 for additional information on commitments and contingencies. Earnings Per Share; Net Income Available to Common Shareholders The difference between basic weighted average shares outstanding and diluted weighted average shares outstanding represents

Business Segments

Business Segments	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Business Segments	3. BUSINESS SEGMENTS We manage and report our operations as four business segments: The three geographic regions of RES: (1) Americas, (2) EMEA, and (3) Asia Pacific; and (4) LaSalle, which offers investment management services on a global basis. Each geographic region offers our full range of Real Estate Services, including agency leasing and tenant representation, capital markets and hotels, property management, facilities management, project and development management, energy management and sustainability, construction management, and advisory, consulting and valuation services. We consider "property management" to represent services provided to non-occupying property investors and "facilities management" to represent services provided to owner-occupiers. LaSalle provides investment management services to institutional investors and high-net-worth individuals. Operating income represents total revenue less direct and allocated indirect expenses. We allocate all indirect expenses to our segments, other than interest and income taxes, as nearly all expenses incurred benefit one or more of the segments. Allocated expenses primarily consist of corporate global overhead, which we allocate to the business segments based on the budgeted operating expenses of each segment. For segment reporting, we present revenue net of gross contract costs in our RES segments. Excluding these costs from revenue and expenses results in a "net" presentation of "fee revenue" and "fee-based operating expenses," which we believe more accurately reflects how we manage our expense base and operating margins. See Note 2 for additional information on our gross and net accounting policies. For segment reporting, we present Equity earnings from real estate ventures within total segment revenue, since the related activity is an integral part of LaSalle, which comprises the majority of our Equity earnings results as a whole. Finally, our measure of segment results excludes Restructuring and acquisition charges. The Chief Operating Decision Maker of JLL measures the segment results net of gross contract costs, inclusive of Equity earnings from real estate ventures, and excluding Restructuring and acquisition charges. As of December 31, 2015 , we define the Chief Operating Decision Maker collectively as our Global Executive Board, which is comprised of our Global Chief Executive Officer, Global Chief Financial Officer and the Chief Executive Officers of each of our four business segments. Summarized financial information by business segment is as follows. Year Ended December 31, ($ in thousands) 2015 2014 2013 Real Estate Services Americas Revenue $ 2,605,556 2,319,136 1,918,092 Equity earnings 5,888 775 549 Total segment revenue 2,611,444 2,319,911 1,918,641 Gross contract costs (212,118 ) (210,380 ) (112,097 ) Total segment fee revenue 2,399,326 2,109,531 1,806,544 Operating expenses: Compensation, operating and administrative expenses 2,297,142 2,045,330 1,689,365 Depreciation and amortization 63,239 55,215 45,285 Total segment operating expenses 2,360,381 2,100,545 1,734,650 Gross contract costs (212,118 ) (210,380 ) (112,097 ) Total fee-based segment operating expenses 2,148,263 1,890,165 1,622,553 Operating income $ 251,063 219,366 183,991 EMEA Revenue $ 1,803,000 1,632,657 1,323,201 Equity earnings (losses) 752 17 (535 ) Total segment revenue 1,803,752 1,632,674 1,322,666 Gross contract costs (397,446 ) (316,440 ) (204,596 ) Total segment fee revenue 1,406,306 1,316,234 1,118,070 Operating expenses: Compensation, operating and administrative expenses 1,631,064 1,488,033 1,212,797 Depreciation and amortization 27,179 23,763 20,547 Total segment operating expenses 1,658,243 1,511,796 1,233,344 Gross contract costs (397,446 ) (316,440 ) (204,596 ) Total fee-based segment operating expenses 1,260,797 1,195,356 1,028,748 Operating income $ 145,509 120,878 89,322 Continued: Summarized financial information by business segment is as follows. Year Ended December 31, ($ in thousands) 2015 2014 2013 Real Estate Services Asia Pacific Revenue $ 1,159,979 1,109,701 965,626 Equity earnings 713 447 129 Total segment revenue 1,160,692 1,110,148 965,755 Gross contract costs (191,780 ) (201,073 ) (118,089 ) Total segment fee revenue 968,912 909,075 847,666 Operating expenses: Compensation, operating and administrative expenses 1,057,962 1,012,639 876,239 Depreciation and amortization 15,529 13,301 12,216 Total segment operating expenses 1,073,491 1,025,940 888,455 Gross contract costs (191,780 ) (201,073 ) (118,089 ) Total fee-based segment operating expenses 881,711 824,867 770,366 Operating income $ 87,201 84,208 77,300 LaSalle Revenue $ 397,136 368,109 254,672 Equity earnings 70,122 47,026 31,200 Total segment revenue 467,258 415,135 285,872 Operating expenses: Compensation, operating and administrative expenses 307,447 281,094 216,203 Depreciation and amortization 2,195 2,059 1,805 Total segment operating expenses 309,642 283,153 218,008 Operating income $ 157,616 131,982 67,864 Segment Reconciling Items Total segment revenue $ 6,043,146 5,477,868 4,492,934 Reclassification of equity earnings 77,475 48,265 31,343 Total revenue 5,965,671 5,429,603 4,461,591 Total segment operating expenses before restructuring and acquisition charges 5,401,757 4,921,434 4,074,457 Operating income before restructuring and acquisition charges 563,914 508,169 387,134 Restructuring and acquisition charges 34,116 42,505 18,315 Operating income $ 529,798 465,664 368,819 Identifiable assets by segment are those assets used by or result from each segment's business. Corporate assets are principally cash and cash equivalents, computer software and hardware, leasehold improvements and office furniture. The following table reconciles segment identifiable assets to consolidated assets and segment investments in real estate ventures to consolidated investments in real estate ventures. December 31, 2015 December 31, 2014 ($ in millions) IDENTIFIABLE ASSETS INVESTMENTS IN REAL ESTATE VENTURES IDENTIFIABLE ASSETS INVESTMENTS IN REAL ESTATE VENTURES Real Estate Services: Americas $ 3,192.8 9.4 $ 2,368.4 8.7 EMEA 1,486.7 1.0 1,328.6 3.1 Asia Pacific 901.2 3.8 775.1 4.4 LaSalle 513.9 297.3 476.2 280.9 Corporate 110.6 — 127.0 — Consolidated $ 6,205.2 311.5 $ 5,075.3 297.1 The following table reconciles segment property and equipment expenditures to consolidated property and equipment expenditures. Year Ended December 31, ($ in millions) 2015 2014 2013 Real Estate Services: Americas $ 55.5 62.9 47.0 EMEA 42.9 40.4 19.2 Asia Pacific 14.4 16.4 15.3 LaSalle 8.4 2.0 2.0 Corporate 27.9 35.2 27.3 Total capital expenditures 149.1 156.9 110.8 Less proceeds on dispositions — — (0.1 ) Net capital expenditures $ 149.1 156.9 110.7 The following table sets forth the revenue and assets from our most significant currencies. TOTAL REVENUE TOTAL ASSETS Year Ended December 31, December 31, ($ in millions) 2015 2014 2013 2015 2014 United States dollar $ 2,536.4 2,214.1 1,954.3 $ 3,653.4 2,809.0 British pound 915.5 833.4 636.3 839.5 749.3 Euro 748.7 701.8 595.9 497.4 507.3 Australian dollar 303.0 303.1 285.3 212.1 158.6 Indian rupee 189.4 155.1 117.5 150.1 122.6 Hong Kong dollar 186.7 170.5 134.6 129.0 118.2 Chinese yuan 178.6 169.2 137.7 107.2 93.1 Japanese yen 170.0 155.1 122.0 53.1 44.1 Singapore dollar 123.2 157.7 96.7 123.1 124.8 Other currencies 614.2 569.6 381.3 440.3 348.3 $ 5,965.7 5,429.6 4,461.6 $ 6,205.2 5,075.3 We face restrictions in certain countries that limit or prevent the transfer of funds to other countries or the exchange of the local currency to other currencies, however, we generally face no such restrictions with regard to the use or application of funds for ordinary course business activities within such countries. The assets of these countries represented approximately 5% of our total assets as of December 31, 2015 and 2014 , respectively.

Business Combinations, Goodwill

Business Combinations, Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2015
BUSINESS COMBINATIONS, GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract]
Business Combinations, Goodwill and Other Intangible Assets	4. BUSINESS COMBINATIONS, GOODWILL AND OTHER INTANGIBLE ASSETS 2015 Business Combinations Activity During the year ended December 31, 2015 , we completed 20 new acquisitions, as presented in the below table. These acquisitions continued to expand our capabilities in key regional markets. Acquired Company Country Business Five D Australia Facilities management Propell National Valuers Australia Valuations HFM Canada Project and development services CMM Projekt & Office Solutions Germany Project and development services Guardian Property Asset Management Ireland Residential agency services Tansei Mall Management Japan Retail property management Neo-Świat Poland Project and development services AGL Sweden Real estate financial advisory Nextport Sweden Tenant representation and relocation management AVM Partners Turkey Retail property management and leasing Avenue9 United Kingdom IT consulting for the hotels and hospitality sector Bluu United Kingdom Project and development services CoR Advisors United States Smart-building consulting and solutions Corrigo United States Cloud-based facility management software and services Cresa South Florida United States Tenant representation Lodgetax United States Hotel real estate tax services and consulting Martin Potts & Associates United States Project and development services Oak Grove Capital United States Debt financing for multifamily and senior housing Shelter Bay Retail Group United States Retail property management Wilson Retail Group United States Retail leasing and capital markets Aggregate terms of these acquisitions included: (1) cash paid at closing of $373.0 million , (2) guaranteed deferred consideration of $23.1 million subject only to the passage of time and (3) contingent earn-out consideration of $105.1 million subject to provisions that will be paid upon certain performance conditions being met which are recorded at their acquisition date fair value. A preliminary allocation of this purchase consideration resulted in goodwill of $280.8 million , identifiable intangibles of $200.6 million , and other net assets (acquired assets less acquired liabilities) of $19.8 million . As of December 31, 2015, we have not completed our analysis to assign fair values to all tangible and intangible assets acquired and therefore the purchase price allocations for these acquisitions have not been completed. These preliminary purchase price allocations will be subject to further refinement and may result in changes to the allocation of consideration and the fair value assigned to all tangible and intangible assets acquired and identified. These acquisitions are individually immaterial, but deemed material in aggregate. Our Consolidated Statements of Comprehensive Income for the year ending December 31, 2015, includes revenue of $134.5 million for these acquisitions and an immaterial amount of net income. The following table provides unaudited pro forma results of operations as if all 2015 acquisitions occurred on January 1, 2014. Unaudited Pro Forma Results of Operations for the Year Ended December 31, ($ in millions) 2015 2014 Revenue $ 6,193.0 5,720.1 Net income attributable to common shareholders 456.2 404.3 These unaudited pro forma results of operations include adjustments for intangible amortization based on our current estimate of the fair value of identifiable intangibles acquired and their associated useful lives as well as an interest expense adjustment based on our estimate of interest that would have been incurred had these acquisitions occurred on January 1, 2014. These unaudited pro forma adjustments are subject to change within the measurement period because the fair value assessments these adjustments are based on are not finalized. In addition, these unaudited pro forma results do not reflect the cost of integration activities or benefits that may result from synergies that may be derived from these acquisitions. Accordingly, these unaudited pro forma results of operations are not necessarily indicative of the results which may occur in the future. In 2015, we also purchased the remaining minority ownership in our Indian operations, which was reflected on our Consolidated Balance Sheet as of December 31, 2014 as an $11.2 million Minority shareholder redemption liability. During the year ended December 31, 2015 , this liability increased by $5.5 million to the final settlement amount of $16.4 million paid in 2015. A corresponding adjustment of $5.5 million was recorded to goodwill. During the year ended December 31, 2015 , we also paid $51.8 million for deferred business acquisition and earn-out obligations for acquisitions completed in prior years. In addition, we paid $2.7 million to acquire a portion of the redeemable noncontrolling interest related to our 2014 acquisition of Tenzing AB, a Swedish real estate services provider. Of the $288.3 million of total additions to goodwill in 2015, we anticipated being able to amortize and deduct $104.1 million for tax purposes as of December 31, 2015 . 2014 Business Combinations Activity During the year ended December 31, 2014 , we completed ten new acquisitions located in the U.S., Spain, Portugal, France, Sweden, England and Malaysia. These acquisitions included: (1) Tenzing, a Swedish commercial real estate services provider specializing in capital markets, (2) W.A. Ellis, a London-based residential agency and valuation firm, (3) CRESA Portland, a tenant representation and corporate services firm located in Portland, Oregon, and (4) CLEO Construction Management, a California-based project management services firm that specializes in medical facilities. We also purchased a portion of the minority ownership in our Indian operations, for which we had previously recorded a minority shareholder redemption liability on the Consolidated Balance Sheet, increasing our ownership from 90% to 95% . The aggregate terms of these acquisitions included: (1) cash paid at closing of $38.2 million , (2) guaranteed deferred consideration subject only to the passage of time of $21.5 million , (3) contingent earn-out consideration subject to provisions that will be paid upon certain conditions being met, which was recorded at the acquisition date fair value of $10.3 million and (4) a redeemable noncontrolling interest of $14.2 million . The acquisition we completed in Sweden includes a redeemable noncontrolling interest in the form of an option agreement that allows the Company to purchase, and the noncontrolling shareholder to put to the Company, this noncontrolling interest in the acquired company in annual increments for the four years following acquisition at a price determined by the profit generated by the acquiree. Of the $69.5 million of total additions to goodwill during the year ended December 31, 2014 , we anticipated being able to amortize and deduct $13.6 million for tax purposes. During the year ended December 31, 2014 , we also paid $39.3 million for deferred business acquisition and earn-out obligations for acquisitions completed in prior years. Earn-Out Payments As of December 31, 2015 , we had the potential to make a maximum of $230.4 million (undiscounted) in earn-out payments on 28 completed acquisitions, subject to the achievement of certain performance criteria. We have accrued $127.3 million , representing the fair value of these obligations as of December 31, 2015 , which is included in Other current and Other long-term liabilities within our Consolidated Balance Sheet. Assuming the achievement of the applicable performance criteria, we anticipate these earn-out payments will be made over the next seven years. Adjustments to earn-out liabilities in periods subsequent to the completion of acquisitions are reflected within Restructuring and acquisition charges in the Consolidated Statements of Comprehensive Income. Refer to Note 9, Fair Value Measurements, and Note 14, Restructuring and Acquisition Charges, for additional discussion. Goodwill and Other Intangible Assets We had $2,368.7 million of goodwill and unamortized intangibles as of December 31, 2015 . Significant portions of our goodwill and unamortized intangibles are denominated in currencies other than the U.S. dollar, which means a portion of the movements in the reported book value of these balances is attributable to movements in foreign currency exchange rates. The tables below detail the foreign exchange impact on our goodwill and intangible balances. As of December 31, 2015 , the goodwill and unamortized intangibles consists of: (1) goodwill of $2,141.5 million with indefinite useful lives that are not amortized, (2) identifiable intangibles of $214.4 million amortized over their remaining finite useful lives, and (3) $12.8 million of identifiable intangibles with indefinite useful lives that are not amortized. The following table details, by reporting segment, the annual movements in goodwill with indefinite useful lives. Real Estate Services ($ in millions) Americas EMEA Asia Pacific LaSalle Consolidated Balance as of January 1, 2014 $ 995.2 647.6 237.9 19.4 1,900.1 Additions, net of adjustments 13.6 56.6 (0.7 ) — 69.5 Impact of exchange rate movements (0.5 ) (53.8 ) (6.4 ) (1.0 ) (61.7 ) Balance as of December 31, 2014 1,008.3 650.4 230.8 18.4 1,907.9 Additions, net of adjustments 153.7 92.7 41.9 — 288.3 Impact of exchange rate movements (0.9 ) (46.9 ) (6.1 ) (0.8 ) (54.7 ) Balance as of December 31, 2015 $ 1,161.1 696.2 266.6 17.6 2,141.5 The following table details, by reporting segment, the annual movements in the gross carrying amount and accumulated amortization of our identifiable intangibles. Real Estate Services ($ in millions) Americas EMEA Asia Pacific LaSalle Consolidated Gross Carrying Amount Balance as of January 1, 2014 $ 101.4 43.1 9.8 7.7 162.0 Additions 2.1 3.8 — — 5.9 Impact of exchange rate movements (0.1 ) (3.1 ) (0.3 ) (0.7 ) (4.2 ) Balance as of December 31, 2014 103.4 43.8 9.5 7.0 163.7 Additions 193.8 6.9 5.3 — 206.0 Impact of exchange rate movements (0.1 ) (2.2 ) (0.5 ) (0.7 ) (3.5 ) Balance as of December 31, 2015 $ 297.1 48.5 14.3 6.3 366.2 Accumulated Amortization Balance as of January 1, 2014 $ (78.2 ) (29.4 ) (8.7 ) (0.1 ) (116.4 ) Amortization expense (6.7 ) (3.9 ) (0.5 ) — (11.1 ) Impact of exchange rate movements — 2.3 0.3 — 2.6 Balance as of December 31, 2014 (84.9 ) (31.0 ) (8.9 ) (0.1 ) (124.9 ) Amortization expense (12.1 ) (3.8 ) (0.7 ) — (16.6 ) Impact of exchange rate movements — 2.2 0.3 — 2.5 Balance as of December 31, 2015 $ (97.0 ) (32.6 ) (9.3 ) (0.1 ) (139.0 ) Net book value as of December 31, 2015 $ 200.1 15.9 5.0 6.2 227.2 We amortize our identifiable intangible assets with finite lives on a straight-line basis over their useful lives. The remaining weighted average amortization period of these identifiable intangible assets is 4.3 years and the remaining estimated future amortization expense by year as of December 31, 2015 is presented in the following table. ($ in millions) 2016 $ 31.4 2017 29.9 2018 27.2 2019 23.9 2020 20.4 Thereafter 81.6 Total $ 214.4

Investments in Real Estate Vent

Investments in Real Estate Ventures	12 Months Ended
	Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]
Investments in Real Estate Ventures	5. INVESTMENTS IN REAL ESTATE VENTURES As of December 31, 2015 and 2014 , we had investments in real estate ventures of $311.5 million and $297.1 million , respectively. We account for the majority of our investments in real estate ventures under the equity method of accounting, however, we report certain of our direct investments at fair value. Our investments are primarily co-investments in approximately 50 separate property or commingled funds for which we also have an advisory agreement. Our investment ownership percentages in these funds generally range from less than 1% to 15% . Approximately half of our $311.5 million balance in Investments in real estate ventures as of December 31, 2015 was attributable to investment vehicles which, utilizing our capital and outside capital primarily provided by institutional investors, invest in certain real estate ventures that own and operate real estate. The remainder of our Investments in real estate ventures primarily represented direct investments in certain real estate ventures that own and operate real estate. Of the amount attributable to investment vehicles, the majority was placed with LaSalle Investment Company II ("LIC II"), in which we held an effective ownership interest of 48.78% . As of December 31, 2015 , LIC II had unfunded capital commitments to underlying funds of $103.2 million and a $20.0 million revolving credit facility (the "LIC II Facility"), principally for working capital needs. LIC II's exposure to the liabilities and losses of the underlying real estate ventures in which it has invested is limited to existing capital contributions and remaining unfunded capital commitments. Considering our proportionate share of LIC II's commitments to underlying funds and our exposure to fund our proportionate share of the then outstanding balance on the LIC II Facility, our maximum potential unfunded commitment to LIC II was $86.6 million as of December 31, 2015 . We expect LIC II to draw down on our commitment over the next five years to satisfy its existing commitments to underlying real estate ventures. The following table summarizes the above discussion relative to LIC II: ($ in millions) December 31, 2015 Our effective ownership interest in co-investment vehicle 48.78 % Our maximum potential unfunded commitments in LIC II $ 86.6 Our share of LIC II's unfunded capital commitments to underlying funds 50.3 Our share of exposure on outstanding borrowings 2.9 Our maximum exposure, assuming facility is fully drawn 9.8 Exclusive of our LIC II commitment structure, we have potential unfunded commitment obligations to other like investment vehicles or direct investments, the aggregate maximum of which is $103.2 million as of December 31, 2015 . Our investments in real estate ventures include investments in entities classified as VIEs we analyze for potential consolidation. We had equity method investments, either directly or indirectly, of $2.1 million and $4.3 million as of December 31, 2015 and December 31, 2014 , respectively, in entities classified as VIEs. We evaluate each of these VIEs to determine whether we might have the power to direct the activities that most significantly impact the entity's economic performance. In certain circumstances, we determined we either did not have the power to direct the key activities, or shared power with other investors, lenders, or other actively-involved third parties. Additionally, our exposure to loss was limited to our investment in the VIEs. Therefore, we concluded we did not have a controlling financial interest in nor were we the primary beneficiary of these VIEs and therefore did not consolidate them in our Consolidated Financial Statements. In other circumstances, we have determined we are the primary beneficiary of certain other VIEs and accordingly, consolidate such entities. The assets of the consolidated VIEs are available only for the settlement of the obligations of the respective entities. The mortgage loans of the consolidated VIEs are non-recourse to JLL. Summarized financial information for our consolidated VIEs is presented in the following tables. December 31, ($ in millions) 2015 2014 Property and equipment, net $ 32.6 37.8 Investments in real estate venture 6.6 5.0 Other assets 4.9 3.5 Total assets $ 44.1 46.3 Liabilities - Mortgage indebtedness $ 25.8 29.3 Members' equity 18.3 17.0 Total liabilities and members' equity $ 44.1 46.3 Year Ended December 31, ($ in millions) 2015 2014 2013 Revenue $ 8.5 4.2 1.0 Gain on sale of investments 1.4 — 2.9 Operating and other expenses (3.9 ) (3.9 ) (0.6 ) Net income $ 6.0 0.3 3.3 The following tables summarize the combined financial information for our unconsolidated real estate ventures (including those held via LIC II) accounted for under either the equity method or at fair value. December 31, ($ in millions) 2015 2014 Balance Sheets: Investments in real estate, net of depreciation $ 12,216.7 10,060.4 Total assets 13,993.9 12,613.1 Mortgage indebtedness 4,345.9 3,979.2 Other borrowings 628.2 754.6 Total liabilities 5,608.3 5,487.1 Total equity $ 8,385.6 7,126.0 Year Ended December 31, ($ in millions) 2015 2014 2013 Statements of Operations: Revenue $ 1,473.6 1,397.6 1,605.2 Net income 1,179.5 1,099.1 906.2 Impairment We evaluate our investments in real estate ventures accounted for under the equity method on a quarterly basis, or as otherwise deemed necessary, for indications we may not be able to recover the carrying value of our investments and whether such investments are other than temporarily impaired. Our assessments consider the existence of impairment indicators in the underlying real estate assets that comprise the majority of our investments. Such assessments, in regards to both the investment and underlying asset levels, are based on evaluations of regular updates to future cash flow models and on factors such as operational performance, market conditions, major tenancy matters, legal and environmental concerns, and our ability and intent to hold each investment. When events or changes in circumstances indicate the carrying amount of one of our investments in real estate ventures may be other than temporarily impaired, we consider the likelihood of recoverability of the carrying amount of our investment as well as the estimated fair value and record an impairment charge as applicable. Impairment charges to write down the carrying value of the real estate assets underlying our investments, our proportionate share of which is recognized within Equity earnings from real estate ventures, are generally the result of completing discounted cash flow models that primarily rely upon Level 3 inputs to determine fair value. Impairment charges recorded within Equity earnings from real estate ventures aggregated to $6.0 million , $2.4 million , and $6.5 million for the years ended December 31, 2015 , 2014 , and 2013 , respectively. Fair Value We report our investments in certain real estate ventures at fair value. For such investments, we increase or decrease our investment each reporting period by the estimated change in fair value. This activity is reflected as gains or losses in our Consolidated Statements of Comprehensive Income within Equity earnings from real estate ventures. The below table shows the movement in our investments in real estate ventures reported at fair value. Year Ended December 31, ($ in millions) 2015 2014 2013 Fair value investments as of January 1, $ 113.6 78.9 63.6 Investments 33.8 35.2 16.8 Distributions (9.0 ) (3.1 ) (3.4 ) Net fair value gains 21.1 7.1 5.1 Foreign currency translation adjustments, net (4.3 ) (4.5 ) (3.2 ) Fair value investments as of December 31, $ 155.2 113.6 78.9 See Note 9 for additional discussion of our investments in real estate ventures reported at fair value.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	6. STOCK-BASED COMPENSATION Restricted Stock Unit Awards Restricted stock unit activity is presented in the below table. Shares Weighted Average Weighted Average Unvested as of January 1, 2013 1,345.9 $ 68.50 Granted 244.4 91.01 Vested (522.8 ) 70.51 Forfeited (42.2 ) 62.38 Unvested as of December 31, 2013 1,025.3 73.09 2.03 Granted 160.5 119.88 Vested (426.6 ) 60.14 Forfeited (13.9 ) 80.74 Unvested as of December 31, 2014 745.3 90.43 2.38 Granted 186.3 159.30 Vested (196.4 ) 78.45 Forfeited (29.2 ) 94.20 Unvested as of December 31, 2015 706.0 111.78 2.03 Unvested shares expected to vest as of December 31, 2015 687.1 111.93 2.04 We determine the fair value of restricted stock units based on the closing market price of the Company's common stock on the grant date. As of December 31, 2015 , we had $30.7 million of unamortized deferred compensation related to unvested restricted stock units, which is anticipated to be recognized over varying periods into 2020 . Shares vested during the years ended December 31, 2015 , 2014 and 2013 , had grant date fair values of $15.4 million , $25.7 million , and $36.9 million , respectively. Shares granted during the years ended December 31, 2015 , 2014 and 2013 had grant date fair values of $29.7 million , $19.2 million and $22.2 million , respectively. Jones Lang LaSalle Amended and Restated Stock Award and Incentive Plan ("SAIP") The SAIP provides for the granting of various stock awards to eligible employees of JLL. Such awards include restricted stock units and options to purchase a specified number of shares of common stock, although we have not granted stock options since 2003. There were approximately 800 thousand shares available for grant under the SAIP as of December 31, 2015 . We also have a stock-based compensation plan for our United Kingdom-based employees, the SAYE plan, that allows for the purchase of stock at a 15% discount from the market price at the beginning of the plan's three and five year vesting periods. Stock-based compensation expense is included within Compensation and benefits expense in our Consolidated Statements of Comprehensive Income. Stock-based compensation expense consisted of the following. Year Ended December 31, ($ in millions) 2015 2014 2013 Restricted stock unit awards $ 20.7 19.3 21.3 SAYE 2.1 1.1 1.0 Total $ 22.8 20.4 22.3 We amortize the grant date fair value of share-based compensation on a straight-line basis over the associated vesting periods for each separately vesting portion of an award. Employees of a specific age, with a sum of age plus years of service with the Company which meets or exceeds 65 , based on the terms of the SAIP, are eligible to be considered for receipt of retirement benefits upon departure from the Company. These award provisions trigger application of certain elements of ASC Topic 718, Compensation - Stock Compensation , whereby the recognition of compensation expense for restricted stock unit awards granted to employees meeting the age plus service criteria is accelerated such that all expense is recognized by the time these employees are considered retirement eligible. Stock Ownership Program ("SOP") Historically, a significant portion of restricted stock units granted each year were awarded in the first quarter of the year under our SOP. The SOP generally required between 10% to 20% of incentive compensation (or "bonus") of certain senior employees be deferred and delivered in restricted stock units. Under the SOP plan, we granted approximately 365 thousand shares of restricted stock in 2012. Subsequent to the 2012 grant, we terminated the SOP and thus no additional restricted stock units have been issued under the SOP. Since the start of the SOP, our employee population has grown significantly and other aspects of our compensation programs have evolved, as a result of which we have determined (1) there are other more targeted and strategic approaches we can take in order to enhance our equity incentive compensation programs, and (2) we can do so in a way that will be less dilutive to shareholders than the SOP would be if we continued this plan. Other Stock-Based Compensation Programs As previously discussed, we also maintain the SAYE plan, a stock-based compensation plan for our United Kingdom-based employees. Under this plan, employees make an annual election to contribute to the plan to purchase stock at a 15% discount from the market price at the beginning of the plan's three and five year vesting periods. There were approximately 425 thousand shares available for grant under the SAYE plan as of December 31, 2015 . Options activity under the SAYE plan is presented in the following table. Year Ended December 31, (options in thousands) 2015 2014 Options granted 76 48 Exercise price - options granted $ 125.50 $ 105.54 Options exercised 82 79 Weighted average exercise price $ 58.84 $ 26.10 The fair values of options granted under the SAYE plan are amortized over their respective vesting periods. There were approximately 156 thousand and 176 thousand options outstanding under the SAYE plan as of December 31, 2015 and 2014 , respectively.

Retirement Plans

Retirement Plans	12 Months Ended
	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Retirement Plans	7. RETIREMENT PLANS Defined Contribution Plans We have a qualified profit sharing plan subject to United States Internal Revenue Code Section 401(k) for eligible U.S. employees. We make employer contributions under this qualified profit sharing plan that are included in the accompanying Consolidated Statements of Comprehensive Income. For the years ended December 31, 2015 , 2014 and 2013 our employer contributions were $19.3 million , $17.1 million and $15.7 million , respectively. The related trust assets of this plan are managed by trustees and are excluded from the accompanying Consolidated Financial Statements. We maintain several defined contribution retirement plans for eligible non-U.S. employees. Our contributions to these plans were approximately $29.0 million , $27.4 million and $23.4 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. Defined Benefit Plans We maintain four defined benefit pension plans in the United Kingdom, Ireland and the Netherlands to provide retirement benefits to eligible employees. It is our policy to fund at least the minimum annual contributions required by applicable regulators. We use a December 31 measurement date for our plans. Effective December 30, 2015 our Netherlands plan was frozen with no expected future service credit as all future contributions for plan participants will be made to a defined contribution plan starting January 1, 2016. This transition resulted in a plan curtailment as certain obligations of the defined benefit plan, included in the projected benefit obligations and plan asset tables below, remain with the Company. The following table provides detail of Net periodic pension cost (benefit) for these four plans. Year Ended December 31, ($ in millions) 2015 2014 2013 Employer service cost - benefits earned during the period $ 4.7 3.7 3.9 Interest cost on projected benefit obligation 14.5 16.1 14.3 Expected return on plan assets (20.9 ) (24.5 ) (19.9 ) Net amortization of deferrals 4.3 1.0 2.1 Curtailment gain (0.4 ) — — Recognized actuarial loss 0.2 0.2 0.5 Net periodic pension cost (benefit) $ 2.4 (3.5 ) 0.9 The following tables provide reconciliations of projected benefit obligations and plan assets (the net of which represents our funded status), as well as the funded status and accumulated benefit obligations, of our defined benefit pension plans. ($ in millions) Change in benefit obligation: 2015 2014 Projected benefit obligation, January 1, $ 427.2 358.2 Service cost 4.7 3.7 Interest cost 14.5 16.1 Curtailments (3.6 ) — Plan participants' contributions 0.4 0.6 Benefits paid (10.1 ) (8.2 ) Actuarial (gain) loss (49.6 ) 88.4 Changes in currency translation rates (23.0 ) (29.3 ) Other (2.0 ) (2.3 ) Projected benefit obligation, December 31, $ 358.5 427.2 Change in plan assets: 2015 2014 Fair value of plan assets, January 1, $ 414.3 383.1 Actual return on plan assets 16.3 33.7 Plan contributions 12.2 14.6 Benefits paid (10.1 ) (8.2 ) Changes in currency translation rates (23.4 ) (28.4 ) Other (24.4 ) 19.5 Fair value of plan assets, December 31, $ 384.9 414.3 Funded status and net amount recognized $ 26.4 (12.9 ) Accumulated benefit obligation, December 31, $ 357.3 423.7 The accumulated benefit obligation was calculated based on the actuarial present value of the vested benefits to which employees are entitled if they terminate their employment immediately. Defined benefit pension plan amounts recorded in the Consolidated Balance Sheets are presented in the below table. December 31, ($ in millions) 2015 2014 Pension assets - included in Other long-term assets $ 30.5 8.0 Pension liabilities - included in Other long-term liabilities (4.1 ) (20.9 ) Net asset (liability) recognized $ 26.4 (12.9 ) Actuarial losses $ 59.0 91.6 Prior service costs 0.6 0.8 Accumulated other comprehensive loss $ 59.6 92.4 The amounts recognized in Other comprehensive income are presented in the table below. Year Ended December 31, ($ in millions) 2015 2014 Current year actuarial (gains ) losses $ (25.2 ) 57.4 Reclassification adjustments included in Net periodic pension cost (4.1 ) (1.2 ) Change in currency translation rates (3.5 ) (2.4 ) Total $ (32.8 ) 53.8 The ranges of assumptions we used in developing the projected benefit obligation as of December 31 are presented in the following table. 2015 2014 Discount rate used in determining present values 2.50% to 3.90% 2.25% to 3.70% Annual increase in future compensation levels 0.00% to 3.50% 0.00% to 3.50% The ranges of assumptions we used in determining net periodic cost (benefit) for the years ended December 31 are presented in the following table. 2015 2014 2013 Discount rate used in determining present values 2.25% to 3.70% 4.00% to 4.65% 3.50% to 4.70% Annual increase in future compensation levels 0.00% to 3.50% 0.00% to 3.85% 0.00% to 3.40% Expected long-term rate of return on assets 2.70% to 5.80% 4.10% to 7.00% 4.70% to 6.64% The discount rate assumptions used for these pension plans were derived from the expected yield of investment grade bonds with durations consistent with the liabilities of these plans. In 2015, there was a relatively modest increase in the yield of investment grade bonds, which is reflected in the modest increase in our discount rate assumptions. In 2014, there was a general market-wide decrease in the yield of investment grade bonds resulting in a decrease in discount rate assumptions from 2013 to 2014. Accordingly, this decrease in discount rate assumptions was the primary driver of the actuarial losses reflected within the year ended December 31, 2014 . The expected long-term rate of return on assets is based on the current level of expected returns on risk-free investments (primarily government bonds), the historical level of the risk premium associated with the other asset classes in which the portfolio is invested and the expectations for future returns of each asset class. The expected return for each asset class is then weighted based on the target asset allocation to develop the expected long-term rate of return on assets assumption for the portfolio. For the year ended December 31, 2015 , the primary component of Other in the change in plan assets table above is the reduction in the plan assets of our Netherlands plan due to the curtailment of this plan. In 2014, the primary component of Other was the impact of the decrease in the discount rate used to determine the fair value of the Netherlands plan assets. Plan assets consist of diversified portfolios principally comprised of equity and debt securities. The investments and investment policies of these defined benefit plans are controlled by the trustees of each plan. The primary investment objective of these trusts is to invest plan assets in such a manner that members' benefit entitlements can be paid when they come due. Plan assets are invested with a long-term focus to achieve a return on investment based on levels of liquidity and investment risk the trustees, in consultation with the Company's management, believe are prudent and reasonable. These trusts set investment target allocations, but generally are not prohibited by the Company from investing in certain types of assets. The pension plans held no derivative instruments as of December 31, 2015 and 2014 . Pension plan assets measured at fair value and cash are presented in the following table with the overall allocation of pension plan assets. December 31, 2015 December 31, 2014 ($ in millions) Level 1 Level 2 Level 3 Total % Level 1 Level 2 Level 3 Total % Equity securities: U.K. equities $ 46.9 15.8 — 62.7 16 % $ 45.2 14.9 — 60.1 15 % Non-U.K. equities 104.7 22.5 — 127.2 33 103.5 21.6 — 125.1 30 Debt securities: Corporate bonds 91.7 31.7 — 123.4 32 92.0 30.4 — 122.4 30 Government and other 7.4 11.6 — 19.0 5 8.0 12.1 — 20.1 5 Cash & cash equivalents 3.6 15.9 — 19.5 5 4.9 25.9 — 30.8 7 Other 1.2 9.4 22.5 33.1 9 1.5 5.5 48.8 55.8 13 Total $ 255.5 106.9 22.5 384.9 100 % $ 255.1 110.4 48.8 414.3 100 % The actual asset allocation as of December 31, 2015 and 2014 approximates each plan's target asset allocation percentages. The Company's defined benefit plan in the Netherlands has its assets invested with a third party insurance company that guarantees the payments of benefits earned under this plan. The valuation of these assets was determined with the assistance of this third party insurance company and is considered a Level 3 measurement. These assets are included in the Other category in the tables above. Future contributions and payments - We expect to contribute $11.1 million to our defined benefit pension plans in 2016 . Additionally, pension benefit payments expected to be paid as of December 31, 2015 , which reflect expected future service, as appropriate, are presented in the following table. ($ in millions) Expected future minimum pension benefit payments 2016 $ 9.2 2017 9.4 2018 9.7 2019 9.9 2020 10.1 2021 to 2025 54.6 Total $ 102.9

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	8. INCOME TAXES Our provision for income taxes consisted of the following: Year Ended December 31, ($ in millions) 2015 2014 2013 U.S. Federal: Current $ 30.3 11.1 4.7 Deferred 17.8 30.3 11.9 $ 48.1 41.4 16.6 State and Local: Current $ 5.3 6.5 2.6 Deferred 1.9 0.3 (1.4 ) $ 7.2 6.8 1.2 International: Current $ 81.9 66.3 58.4 Deferred (4.4 ) (16.9 ) 15.9 $ 77.5 49.4 74.3 Total $ 132.8 97.6 92.1 In 2015 , our current tax expense was reduced by $16.8 million , and our deferred tax expense was increased by a corresponding amount, due to the utilization of net operating loss carryovers. In 2014 and 2013 , our current tax expense was reduced by $23.5 million and $53.3 million , respectively, due to the utilization of prior years' net operating loss carryovers. Income tax expense differed from the amounts computed by applying the U.S. federal income tax rate of 35% to earnings before provision for income taxes as a result of the following: Year Ended December 31, ($ in millions) 2015 2014 2013 Income tax expense at statutory rates $ 202.7 35.0 % $ 170.0 35.0 % $ 127.9 35.0 % Increase (reduction) in income taxes from: State and local income taxes, net of federal income tax benefit 5.9 1.0 5.1 1.0 1.4 0.4 Amortization of goodwill and other intangibles (5.1 ) (0.9 ) (5.2 ) (1.1 ) (5.7 ) (1.6 ) Nondeductible expenses 5.4 0.9 5.1 1.0 2.1 0.6 International earnings taxed at various rates (57.0 ) (9.8 ) (59.1 ) (12.2 ) (38.9 ) (10.6 ) Valuation allowances (4.7 ) (0.8 ) 7.4 1.5 5.9 1.6 Recognition of tax benefit, net of nondeductible indemnification asset write-off (8.3 ) (1.4 ) (22.4 ) (4.6 ) — — Other, net (6.1 ) (1.1 ) (3.3 ) (0.5 ) (0.6 ) (0.2 ) Total $ 132.8 22.9 % $ 97.6 20.1 % $ 92.1 25.2 % With respect to international earnings taxed at various rates, we have operations which constitute a taxable income presence in 94 countries or other taxable jurisdictions outside of the U.S. which are treated as such by the United States Internal Revenue Code. All of those countries had income tax rates lower than the combined U.S. federal and state income tax rate in 2015 . With respect to jurisdictions in which we operate with very low tax rates, income from Hong Kong ( 16.5% ), Singapore ( 17% ), the United Kingdom ( 20.25% ), The People's Republic of China ( 25% ), and the Netherlands ( 25% ) represent the most significant components of the international earnings line item in our effective tax rate reconciliation. Other very low rate tax jurisdictions with meaningful contributions to the international earnings line item in our effective tax rate reconciliation for 2015 include Cyprus ( 12.5% ), Ireland ( 12.5% ), Poland ( 19% ), and Switzerland ( 21.2% ). In the aggregate, these very low tax rate jurisdictions contributed over two-thirds of the difference between the actual income tax provision for international earnings and the equivalent provision at the U.S. statutory rate in 2015 . The remaining difference was contributed by earnings in jurisdictions with effective tax rates above 25% and by earnings of insignificant amounts in very low tax rate jurisdictions other than those noted above. In defining very low tax rate jurisdictions, we consider effective tax rates which applied in 2015 based upon income levels and including national and municipal, state or provincial taxes also based upon income levels, which may cause those effective rates to differ from the maximum national statutory rates for the jurisdictions. We consider jurisdictions with a tax rate of 25% or lower to be very low tax rate jurisdictions, which represents a difference of 10% or more from the U.S. federal statutory income tax rate. Our income before taxes from domestic (U.S.) and international sources is presented in the following table. Year Ended December 31, ($ in millions) 2015 2014 2013 Domestic $ 132.1 111.2 102.8 International 447.0 374.4 262.6 Total $ 579.1 485.6 365.4 The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities are presented below. December 31, ($ in millions) 2015 2014 2013 Deferred tax assets attributable to: Accrued expenses $ 170.5 153.0 128.6 U.S. federal and state loss and credit carryovers 6.6 14.6 56.9 Allowances for uncollectible accounts 7.1 6.8 6.1 International loss carryovers 121.0 136.9 133.5 Investments in real estate ventures 26.9 33.6 38.8 Pension liabilities 12.6 20.0 9.2 Deferred tax assets 344.7 364.9 373.1 Less: valuation allowances (51.7 ) (62.0 ) (60.5 ) Net deferred tax assets $ 293.0 302.9 312.6 Deferred tax liabilities attributable to: Property and equipment $ 0.6 1.6 5.7 Intangible assets 123.9 101.7 91.7 Income deferred for tax purposes 2.2 1.6 2.2 Other 0.4 5.5 6.8 Deferred tax liabilities $ 127.1 110.4 106.4 We have not provided a deferred tax liability on the unremitted foreign earnings of international subsidiaries because it is our intent to permanently reinvest such earnings outside of the U.S. If repatriation of all such earnings were to occur, we estimate our resulting U.S. federal and state tax liability would be approximately $235.0 million , net of the benefits of utilization of foreign tax credits. As of December 31, 2015 , we had no available U.S. net operating loss carryover, U.S. state net operating loss carryovers of $6.6 million , which expire at various dates through 2030 , and international net operating loss carryovers of $500.3 million , which generally do not have expiration dates. The change in deferred tax balances for net operating loss carryovers from 2014 to 2015 includes increases from current year losses, and decreases from current year estimated utilization. As of December 31, 2015 , we believe it is more likely than not the net deferred tax assets of $165.9 million will be realized based upon our estimates of future income and the consideration of net operating losses, earnings trends, and tax planning strategies. Valuation allowances have been provided with regard to the tax benefit of certain international net operating loss carryovers, for which we have concluded recognition is not yet appropriate. In 2015 , we reduced valuation allowances by $10.3 million on some jurisdictions' net operating losses due to the utilization or expiration of those losses, and we increased valuation allowances by $4.6 million for other jurisdictions based upon circumstances that caused us to establish or continue to provide valuation allowances on current or prior year losses in addition to those provided in prior years. The balance of movement in valuation allowances comparing December 31, 2015 to December 31, 2014 was attributable to the effect of changes in foreign currency exchange rates. As of December 31, 2015 , our net current receivable for income tax was $2.3 million , consisting of a current receivable of $90.4 million and current payable of $88.1 million and our net noncurrent liability was $13.1 million , consisting of a noncurrent payable of $13.1 million . As of December 31, 2014, our net current liability for income tax was $44.8 million , consisting of a current receivable of $59.3 million and a current payable of $104.1 million . The Company or one or more of its subsidiaries files income tax returns in the U.S. (including 47 states, 25 cities, the District of Columbia, and Puerto Rico), the United Kingdom (including England and Scotland), Australia, Germany, The People's Republic of China (including Hong Kong and Macau), France, Japan, Singapore, India, The Netherlands, Spain, and 80 other countries. Generally, the Company's open tax years include those from 2011 to the present, although reviews of taxing authorities for more recent years have been completed or are in process in a number of jurisdictions. As of December 31, 2015 , the Company is under examination in the United Kingdom, France, Germany, The Netherlands, India, Indonesia, China, and Taiwan. In the U.S., the Company is under examination in the States of Massachusetts, New York and Texas. A reconciliation of the beginning and ending amount of unrecognized tax benefits is presented in the following table. ($ in millions) 2015 2014 Balance as of January 1 $ 48.5 81.1 Additions based on tax positions related to the current year 7.8 6.8 Decrease for the reversals of tax positions of prior years (11.2 ) (4.7 ) Reductions for use in settlements with taxing authorities — (0.2 ) Lapse of statute of limitations (16.8 ) (34.5 ) Balance as of December 31 $ 28.3 48.5 Of the $16.8 million reduction in unrecognized tax benefits noted above, $12.8 million was offset by a restructuring and acquisition charge related to the write-off of an indemnification asset of equal amount that arose from prior period acquisition activity. These two items offset each other in net income. We believe it is reasonably possible matters for which we have recorded $7.0 million of gross unrecognized tax benefits will be resolved within twelve months after December 31, 2015 . The recognition of tax benefits, and other changes to the amounts of our unrecognized tax benefits, may occur as the result of ongoing operations, the outcomes of audits or other examinations by tax authorities, or the passing of statutes of limitations. We do not expect changes to our unrecognized tax benefits to have a significant impact on net income, the financial position, or the cash flows of the Company. We do not believe we have material tax positions for which the ultimate deductibility is highly certain, but there is uncertainty about the timing of such deductibility. We recognize interest accrued and penalties, if any, related to income taxes as a component of income tax expense. During the years ended December 31, 2015 , 2014 , and 2013 , we recognized approximately $0.1 million , $0.5 million , and $0.9 million , respectively, in interest expense and no penalties. We had approximately $1.8 million and $4.7 million of accrued interest related to income taxes as of December 31, 2015 and 2014 , respectively.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	9. FAIR VALUE MEASUREMENTS The Company measures certain assets and liabilities in accordance with ASC 820, Fair Value Measurements and Disclosures , which defines fair value as the price that would be received for an asset or paid to transfer a liability in an orderly transaction between market participants on the measurements date. In addition, it establishes a framework for measuring fair value highlighted by the following three-tier fair value hierarchy: • Level 1 - Quoted prices for identical assets or liabilities in active markets accessible as of the measurement date; • Level 2 - Inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and • Level 3 - Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions. There were no transfers among levels of valuations during the years ended December 31, 2015 and 2014 . Our policy is to recognize transfers at the end of quarterly reporting periods. Financial Instruments Our financial instruments include Cash and cash equivalents, Trade receivables, Notes and other receivables, Warehouse receivables, restricted cash, Accounts payable, Short-term borrowings, Warehouse facility, Credit facility, Long-term senior notes and foreign currency exchange contracts. The carrying amounts of Cash and cash equivalents, Trade receivables, Notes and other receivables, Warehouse receivables, restricted cash, Accounts payable, and the Warehouse facility approximate their estimated fair values due to the short-term maturity of these instruments. The carrying values of our Credit facility and Short-term borrowings approximate their estimated fair values given the variable interest rate terms and market spreads. We estimated the fair value of our Long-term senior notes as $282.0 million and $285.3 million as of December 31, 2015 and 2014 , respectively, using dealer quotes that are Level 2 inputs in the fair value hierarchy. The carrying value of our Long-term senior notes was $275.0 million as of December 31, 2015 and 2014 . We record Warehouse receivables at the lower of cost or fair value based on the commitment purchase price. When applicable, we determine the fair value of Warehouse receivables based on readily observable Level 2 inputs. Recurring Fair Value Measurements The following table categorizes by level in the fair value hierarchy the estimated fair value of our assets and liabilities measured at fair value on a recurring basis. December 31, 2015 2014 ($ in millions) Level 2 Level 3 Level 2 Level 3 Assets Foreign currency forward contracts receivable $ 9.5 — 10.5 — Deferred compensation plan assets 134.3 — 111.2 — Investments in real estate ventures - fair value — 155.2 — 113.6 Total assets at fair value $ 143.8 155.2 121.7 113.6 Liabilities Foreign currency forward contracts payable $ 21.2 — 18.2 — Deferred compensation plan liabilities 129.4 — 107.9 — Earn-out liabilities — 127.3 — 25.1 Total liabilities at fair value $ 150.6 127.3 126.1 25.1 Foreign Currency Forward Contracts We regularly use foreign currency forward contracts to manage our currency exchange rate risk related to intercompany lending and cash management practices. These contracts are on our Consolidated Balance Sheet as current assets and current liabilities and the fair value of these contracts are determined based on current market rates. The inputs for these valuations are Level 2 inputs in the fair value hierarchy. As of December 31, 2015 and 2014 , these contracts had a gross notional value of $2.28 billion ( $1.26 billion on a net basis) and $2.03 billion ( $1.19 billion on a net basis), respectively. The asset and liability positions recorded for our foreign currency forward contracts are based on the net payable or net receivable position with the financial institutions from which we purchase these contracts. The $9.5 million asset as of December 31, 2015 was comprised of gross contracts with receivable positions of $10.0 million and payable positions of $0.5 million . The $21.2 million liability position as of December 31, 2015 was comprised of gross contracts with receivable positions of $0.9 million and payable positions of $22.1 million . As of December 31, 2014 , the $10.5 million asset was comprised of gross contracts with receivable positions of $12.5 million and payable positions of $2.0 million . The $18.2 million liability position as of December 31, 2014 , was comprised of gross contracts with receivable positions of $1.1 million and payable positions of $19.3 million . Deferred Compensation Plan We maintain a deferred compensation plan for certain of our U.S. employees that allows them to defer portions of their compensation. We invest directly in insurance contracts which yield returns to fund these deferred compensation obligations. We recognize an asset for the amount that could be realized under these insurance contracts at the balance sheet date, and the deferred compensation obligation is adjusted to reflect the changes in the fair value of the amount owed to the employees. The inputs for this valuation are Level 2 inputs in the fair value hierarchy. This plan was recorded on our Consolidated Balance Sheet as of December 31, 2015 as Deferred compensation plan assets of $134.3 million , long-term Deferred compensation liabilities of $129.4 million , and as a reduction of equity, Shares held in trust, of $6.2 million . This plan was recorded on our Consolidated Balance Sheet as of December 31, 2014 as Deferred compensation plan assets of $111.2 million , long-term Deferred compensation liabilities of $107.9 million , and as a reduction of equity, Shares held in trust, of $6.4 million . Investments in Real Estate Ventures at Fair Value We report certain direct investments in real estate ventures at fair value. For these fair value investments in real estate ventures, we increase or decrease our investment each reporting period by the change in the fair value of these investments. These fair value adjustments are reported in our Consolidated Statements of Comprehensive Income within Equity earnings from real estate ventures. We estimate fair value using NAV per share (or its equivalent), generally a Level 3 input in the fair value hierarchy, as provided by our investees. Critical inputs to NAV estimates included valuations of the underlying real estate assets and borrowings, which incorporate investment-specific assumptions such as discount rates, capitalization rates, rental and expense growth rates and asset-specific market borrowing rates. No adjustments to NAV estimates provided by investees, including adjustments to contemplate any restrictions to the transferability of ownership interests embedded within investment agreements to which we are a party, were considered necessary based upon (1) our understanding of the methodology utilized and inputs incorporated to estimate NAV at the investee level derived through LaSalle's role as advisor or manager of these ventures, (2) consideration of market demand for the specific types of real estate assets held by each venture, and (3) contemplation of real estate and capital markets conditions in the localities in which these ventures operate. Earn-Out Liabilities We classify our earn-out liabilities within Level 3 in the fair value hierarchy because the inputs used to develop the estimated fair value include unobservable inputs. The fair value of our earn-out liabilities is based on the present value of probability-weighted future cash flows related to the earn-out performance criteria on each reporting date. The probabilities of achievement we assign to the performance criteria are determined based on our due diligence performed at the time of acquisition as well as actual performance achieved subsequent to acquisition. See Note 4, Business Combinations, Goodwill and Intangibles, for additional discussion of our earn-out liabilities. Non-Recurring Fair Value Measurements We review our investments in real estate ventures, except those investments otherwise reported at fair value, on a quarterly basis, or as otherwise deemed necessary, for indications of whether we may not be able to recover the carrying value of our investments and whether such investments are other than temporarily impaired. When the carrying amount of the investment is in excess of the estimated future undiscounted cash flows, we use a discounted cash flow approach or other acceptable method to determine the fair value of the investment in computing the amount of the impairment. Our determination of fair value primarily relies on Level 3 inputs. We did not recognize any significant investment-level impairment losses during the years ended December 31, 2015 , 2014 or 2013 . See Note 5, Investments in Real Estate Ventures, for additional information, including information related to impairment charges recorded at the investee level.

Debt

Debt	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Debt	10. DEBT Credit Facility On February 25, 2015, we amended and expanded our credit facility agreement (the "Facility"), which resulted in (1) an increase in our borrowing capacity from $1.2 billion to $2.0 billion , (2) an extension of the maturity date from October 4, 2018 to February 25, 2020, (3) increases in certain add-backs to adjusted EBITDA (as defined in the Facility) for the calculation of the leverage ratio to provide additional operating flexibility and (4) a range of pricing from LIBOR plus 1.00% to 2.05% , with pricing as of December 31, 2015 at LIBOR plus 1.00% . Under this new agreement, our leverage ratio cannot exceed 3.50 to 1, except immediately following a material acquisition, in which case, the leverage ratio maximum is 4.00 to 1 for up to four consecutive quarters. Other key terms and conditions of the Facility were unchanged as part of the current amendment and expansion. As of December 31, 2015 , we had outstanding borrowings under the Facility of $255.0 million and outstanding letters of credit of $18.2 million . As of December 31, 2014 , we had no outstanding borrowings under the Facility and outstanding letters of credit of $22.0 million . The average outstanding borrowings under the Facility were $335.1 million and $357.0 million for the years ended December 31, 2015 and 2014 , respectively. The effective interest rates on our Facility were 1.1% and 1.2% for the years ended December 31, 2015 and 2014 , respectively. We remained in compliance with all covenants under our Facility as of December 31, 2015 , including a minimum cash interest coverage ratio of 3.00 to 1 and the maximum leverage ratio discussed above. Included in debt for the calculation of the leverage ratio is the present value of deferred business acquisition obligations and included in adjusted EBITDA (as defined in the Facility) are, among other things, (1) an add-back for stock-based compensation expense, (2) the addition of the EBITDA of acquired companies earned prior to acquisition and (3) add-backs for certain impairment and non-recurring charges. In addition, we are restricted from, among other things, incurring certain levels of indebtedness to lenders outside of the Facility and disposing of a significant portion of our assets. Lender approval or waiver is required for certain levels of cash acquisitions and co-investment. We will continue to use the Facility for business acquisitions, working capital needs (including payment of accrued incentive compensation), co-investment activities, dividend payments, share repurchases and capital expenditures. Short-Term In addition to our Facility, we have the capacity to borrow up to an additional $42.1 million under local overdraft facilities. We had short-term borrowings (including capital lease obligations, overdrawn bank accounts and local overdraft facilities) of $49.2 million and $19.6 million as of December 31, 2015 and 2014 , respectively, of which $24.6 million and $14.6 million as of December 31, 2015 and 2014 , respectively, were attributable to local overdraft facilities. Long-Term Senior Notes As of December 31, 2015 and 2014 , we had $275.0 million of Long-term senior notes due November 2022 (the "Notes") outstanding. The Notes bear interest at an annual rate of 4.4% , subject to adjustment if a credit rating assigned to the Notes is downgraded below an investment grade rating (or subsequently upgraded). Interest is payable semi-annually on May 15 and November 15 . Our issuer and senior unsecured ratings are investment grade as of December 31, 2015 : BBB+ (stable outlook) from Standard & Poor’s Ratings Services and Baa2 (positive outlook) from Moody’s Investors Service, Inc.

Leases

Leases	12 Months Ended
	Dec. 31, 2015
Leases [Abstract]
Leases	11. LEASES We lease office space in various buildings for our own use. The terms of these non-cancelable operating leases provide for us to pay base rent and a share of operating expenses and real estate taxes in excess of defined amounts. We also lease equipment under both operating and capital lease arrangements. Minimum future lease payments (e.g., base rent for leases of office space) due in each of the next five years and thereafter, as of December 31, 2015 , are presented in the below table. ($ in millions) 2016 $ 143.5 2017 121.6 2018 104.4 2019 91.2 2020 75.3 Thereafter 226.6 Total $ 762.6 As of December 31, 2015 , we have accrued liabilities related to excess lease space of $4.3 million , including $2.4 million related to excess lease space as a result of combining King Sturge's offices with our offices. The total of minimum rentals to be received in the future as sublessor under noncancelable operating subleases as of December 31, 2015 was $16.8 million . Total rent expense, including office space and other rentals, was $141.1 million , $141.0 million and $131.2 million for the years ended December 31, 2015 , 2014 and 2013 , respectively.

Transactions with Affiliates

Transactions with Affiliates	12 Months Ended
	Dec. 31, 2015
Related Party Transactions [Abstract]
Transactions with Affiliates	12. TRANSACTIONS WITH AFFILIATES As part of our co-investment strategy, we have equity interests in real estate ventures, some of which have certain of our officers as trustees or board of director members, and from which we earn advisory and management fees. Included in the accompanying Consolidated Financial Statements is revenue of $195.1 million , $143.3 million , and $125.7 million for 2015 , 2014 and 2013 , respectively, as well as receivables of $32.9 million and $15.1 million as of December 31, 2015 and 2014 , respectively, related to transactions with affiliates primarily a result of transactions with the real estate ventures in which we have equity interests. The outstanding balance of loans to employees are presented in the following table. December 31, ($ in millions) 2015 2014 Loans related to co-investments (1) $ 13.4 8.6 Advances, travel and other (2) 126.7 75.0 Total $ 140.1 83.6 (1) These nonrecourse loans have been made to allow employees the ability to participate in investment fund opportunities. (2) Consists primarily of commissions and other compensation advances to employees that are amortized to Compensation and benefits based on performance over required service periods. The Company does not extend credit or provide personal loans to any director or executive officer of the Company.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	13. COMMITMENTS AND CONTINGENCIES We are a defendant in various litigation matters arising in the ordinary course of business, some of which involve claims for damages that are substantial in amount. Many of these litigation matters are covered by insurance (including insurance provided through a consolidated captive insurance company as further discussed below), but they may nevertheless be subject to large deductibles and the amounts being claimed may exceed the available insurance. Although the ultimate liability for these matters cannot be determined, based upon information currently available, we believe the ultimate resolution of such claims and litigation will not have a material adverse effect on our financial position, results of operations or liquidity. In order to better manage our global insurance program and support our risk management efforts, we supplement our traditional insurance coverage for certain types of claims, primarily professional indemnity, by using a wholly-owned captive insurance company. The level of risk retained by our captive insurance company, with respect to professional indemnity claims, is up to $2.5 million per claim, inclusive of the deductible. When a potential loss event occurs, management estimates the ultimate cost of the claim and accrues the related cost in Other current and long-term liabilities on our Consolidated Balance Sheets when probable and estimable. The following table shows the professional indemnity reserve activity and related payments. ($ in millions) January 1, 2013 $ 1.6 New claims 5.7 Prior year claims adjustments (0.2 ) Claims paid (0.9 ) December 31, 2013 6.2 New claims 7.4 Prior year claims adjustments (0.8 ) Claims paid (3.6 ) December 31, 2014 9.2 New claims 2.9 Prior year claims adjustments 7.8 Claims paid (0.7 ) December 31, 2015 $ 19.2 Included in the professional indemnity reserve balances as of December 31, 2015 and 2014 are amounts we expect reimbursement from third-party insurers of $9.0 million and $1.8 million , respectively. The receivable balances are included in Notes and other receivables within the Consolidated Balance Sheets.

Restructuring and Acquisition C

Restructuring and Acquisition Charges	12 Months Ended
	Dec. 31, 2015
Restructuring and Related Activities [Abstract]
Restructuring and Acquisition Charges	14. RESTRUCTURING AND ACQUISITION CHARGES For the years ended December 31, 2015 , 2014 and 2013 , we recognized Restructuring and acquisition charges of $34.1 million , $42.5 million and $18.3 million , respectively. In 2015 , $12.8 million related to the write-off of an indemnification asset that arose from prior period acquisition activity and $2.4 million related to net increases to earn-out liabilities that arose from prior period acquisition activity. In 2014 , $34.5 million related to the write-off of an indemnification asset that arose from prior period acquisition activity, offset by $3.9 million of net decreases to earn-out liabilities that arose from prior period acquisition activity. The remaining expense for the years ended December 31, 2015 , 2014 and 2013 , primarily consisted of (1) severance, (2) lease exit charges and fair value reserve adjustments, and (3) other acquisition and integration costs. The following table shows the restructuring and acquisition accrual activity and related payments and is exclusive of the indemnification asset write-offs and the adjustments to earn-out liabilities noted above. ($ in millions) Severance Retention Bonuses Lease Exit Other Acquisition Costs Total January 1, 2013 $ 10.0 5.2 12.0 4.2 31.4 Accruals 12.3 0.1 (1.4 ) 7.3 18.3 Payments made (18.5 ) (4.9 ) (4.7 ) (11.1 ) (39.2 ) December 31, 2013 3.8 0.4 5.9 0.4 10.5 Accruals 5.2 — 3.2 3.5 11.9 Payments made (6.0 ) (0.4 ) (4.9 ) (3.5 ) (14.8 ) December 31, 2014 3.0 — 4.2 0.4 7.6 Accruals 1.7 — 1.6 15.6 18.9 Payments made (2.0 ) — (0.1 ) (15.8 ) (17.9 ) December 31, 2015 $ 2.7 — 5.7 0.2 8.6 We expect accrued severance and other accrued acquisition costs will be paid during 2016 . Lease exit payments are dependent on the terms of various leases, which extend as far out as 2020.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss) by Component (Notes)	12 Months Ended
	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	15. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) BY COMPONENT The table below presents the changes in Accumulated other comprehensive income (loss) by component. ($ in millions) Pension and postretirement benefit Cumulative foreign currency translation adjustment Total Balance as of January 1, 2014 $ (26.3 ) 1.1 (25.2 ) Other comprehensive loss before reclassification (38.1 ) (137.9 ) (176.0 ) Amounts reclassified from AOCI after tax expense of $0.2, $- and $0.2 1.0 — 1.0 Other comprehensive loss after tax benefit of $16.7, $- and $16.7 (37.1 ) (137.9 ) (175.0 ) Balance as of December 31, 2014 (63.4 ) (136.8 ) (200.2 ) Other comprehensive income (loss) before reclassification 24.3 (163.7 ) (139.4 ) Amounts reclassified from AOCI after tax expense of $0.8, $- and $0.8 3.3 — 3.3 Other comprehensive income (loss) after tax expense of $5.2, $- and $5.2 27.6 (163.7 ) (136.1 ) Balance as of December 31, 2015 $ (35.8 ) (300.5 ) (336.3 ) For pension and postretirement benefits, amounts reclassified from Accumulated other comprehensive income (loss) shown above are reported in Compensation and benefits within the Consolidated Statements of Comprehensive Income.

Subsequent Events (Notes)

Subsequent Events (Notes)	12 Months Ended
	Dec. 31, 2015
Subsequent Events [Abstract]
Subsequent Events [Text Block]	16. SUBSEQUENT EVENTS Subsequent to December 31, 2015 , JLL announced the completion of the following business acquisitions: • ACREST - a retail asset management business located in Germany, • Big Red Rooster - a retail design and brand experience furm located in the U.S., • Bill Goold Realty - a commercial rental residential property broker located in Canada, • Cobertura SA - an agency, located in Portugal, specializing in the country's prime residential sector, • Colliers Baltimore - a leasing and property management business located in the U.S., • Strategic Advisory Group - a hotels and hospitality strategic consulting firm located in the U.S., and • Trussard Property Consultants - a commercial real estate business located in South Africa. Total consideration payable for these acquisitions could be up to $92.5 million . Additionally, subsequent to December 31, 2015 , we invested $40.5 million in LaSalle Logiport REIT, a listed Japanese Real Estate Investment Trust advised by LaSalle.

Quarterly Results of Operations

Quarterly Results of Operations (Unaudited)	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information [Text Block]	QUARTERLY RESULTS OF OPERATIONS (UNAUDITED) The tables on the following pages set forth certain unaudited consolidated statements of operations data for each of our past eight quarters. In our opinion, this information has been presented on the same basis as the audited Consolidated Financial Statements appearing elsewhere in this report, and includes all adjustments, consisting only of normal recurring adjustments and accruals, we consider necessary for a fair presentation. The unaudited consolidated quarterly information should be read in conjunction with our Consolidated Financial Statements and the notes thereto as well as the "Summary of Critical Accounting Policies and Estimates" section within "Management's Discussion and Analysis of Financial Condition and Results of Operations." The operating results for any quarter are not necessarily indicative of the results for any future period. We note the following points regarding how we prepare and present our financial statements on a periodic basis. Periodic Accounting for Incentive Compensation An important part of our overall compensation package is incentive compensation, which we typically pay to employees in the year after it is earned. In our interim financial statements, we have accrued for incentive compensation based on the percentage of compensation costs and adjusted operating income relative to forecasted compensation costs and adjusted operating income for the full year, as substantially all incentive compensation pools are based upon full year results. The impact of this incentive compensation accrual methodology is that we accrue less compensation in the first six months of the year, with the majority of our incentive compensation accrued in the second half of the year, particularly in the fourth quarter, in line with the general trend of increasing revenue and profit as the year progresses as further discussed below. We exclude from our standard accrual methodology incentive compensation pools not subject to the normal performance criteria. These pools are generally accrued for on a straight-line basis. Income Taxes We provide for the effects of income taxes on interim financial statements based on our estimate of the effective tax rate for the full year. We assess our effective tax rate on a quarterly basis and reflect the benefit from tax planning actions when we believe it is probable they will be successful. We account for the cumulative catch-up impact of any change in estimated effective tax rate our business realizes in the quarter a change is made. Seasonality Our quarterly revenue and profits tend to grow progressively by quarter throughout the year. This is a result of a general focus in the real estate industry on completing or documenting transactions by fiscal-year-end and the fact that certain expenses are constant through the year. Historically, we have reported a relatively smaller profit in the first quarter and then increasingly larger profits during each of the following three quarters, excluding the recognition of investment-generated performance fees and co-investment equity gains or losses (each of which can be particularly unpredictable). Such performance fees and co-investment equity gains are generally recognized when assets are sold, the timing of which is geared toward the benefit of our clients. Non-variable operating expenses, which are recognized as they are incurred throughout the year, are relatively constant on a quarterly basis. JONES LANG LASALLE INCORPORATED QUARTERLY INFORMATION - 2015 (UNAUDITED) Quarter Ended Year Ended ($ in millions, except per share data) March 31, 2015 June 30, 2015 September 30, 2015 December 31, 2015 December 31, 2015 Revenue: Real Estate Services: Americas $ 554.5 598.0 643.9 815.0 2,611.4 EMEA 325.4 417.4 447.0 614.1 1,803.9 Asia Pacific 237.7 279.7 280.9 362.5 1,160.8 LaSalle Investment Management 97.2 105.5 154.9 109.5 467.1 Less: Equity earnings from real estate ventures 11.3 27.1 25.4 13.7 77.5 Total revenue 1,203.5 1,373.5 1,501.3 1,887.4 5,965.7 Operating expenses: Real Estate Services: Americas 519.1 552.0 582.3 706.9 2,360.3 EMEA 328.3 385.2 420.6 524.3 1,658.4 Asia Pacific 233.3 263.5 268.0 308.8 1,073.6 LaSalle Investment Management 69.3 68.0 92.0 80.2 309.5 Plus: Restructuring charges 0.8 1.8 18.1 13.4 34.1 Total operating expenses 1,150.8 1,270.5 1,381.0 1,633.6 5,435.9 Operating income 52.7 103.0 120.3 253.8 529.8 Net income attributable to common shareholders $ 41.9 90.1 110.5 195.9 438.4 Basic earnings per common share (1) $ 0.93 2.01 2.45 4.35 9.75 Diluted earnings per common share (1) $ 0.92 1.98 2.43 4.31 9.65 (1) Earnings per common share amounts are individually calculated for each quarter as well as the full annual period. As a result, quarterly earnings per common share do not sum to the total for the full year. JONES LANG LASALLE INCORPORATED QUARTERLY INFORMATION - 2014 (UNAUDITED) Quarter Ended Year Ended ($ in millions, except per share data) March 31, 2014 June 30, 2014 September 30, 2014 December 31, 2014 December 31, 2014 Revenue: Real Estate Services: Americas $ 447.3 545.1 581.7 745.9 2,320.0 EMEA 311.9 395.6 368.6 556.6 1,632.7 Asia Pacific 214.6 267.5 272.9 355.1 1,110.1 LaSalle Investment Management 72.5 81.5 162.4 98.7 415.1 Less: Equity earnings from real estate ventures 8.9 12.5 19.6 7.3 48.3 Total revenue 1,037.4 1,277.2 1,366.0 1,749.0 5,429.6 Operating expenses: Real Estate Services: Americas 430.3 498.3 533.6 638.3 2,100.5 EMEA 316.8 370.9 352.2 471.9 1,511.8 Asia Pacific 213.4 251.7 257.8 303.0 1,025.9 LaSalle Investment Management 56.2 59.2 94.9 72.9 283.2 Plus: Restructuring charges 36.0 5.4 — 1.1 42.5 Total operating expenses 1,052.7 1,185.5 1,238.5 1,487.2 4,963.9 Operating income (loss) (15.3 ) 91.7 127.5 261.8 465.7 Net income attributable to common shareholders $ 15.9 71.7 104.3 193.8 385.7 Basic earnings per common share $ 0.36 1.61 2.33 4.33 8.63 Diluted earnings per common share $ 0.35 1.58 2.30 4.29 8.52

Summary of Significant Accoun25

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]	Restricted Cash Restricted cash primarily consists of cash amounts set aside to satisfy legal or contractual requirements arising in the normal course of business. We are restricted in our ability to withdraw these funds other than for their specified use. Restricted cash of $75.6 million was included in Other current assets within our Consolidated Balance Sheet as of December 31, 2015 . As of December 31, 2014 , our restricted cash balance was immaterial.
Principles of Consolidation	Principles of Consolidation Our Consolidated Financial Statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("U.S. GAAP") and include the accounts of JLL and its majority-owned and controlled subsidiaries. All intercompany balances and transactions have been eliminated. Investments in real estate ventures over which we exercise significant influence, but do not control, are accounted for either under the equity method or at fair value. When applying principles of consolidation, we begin by determining whether an investee entity is a variable interest entity ("VIE") or a voting interest entity. U.S. GAAP draws a distinction between voting interest entities, which are embodied by common and traditional corporate and partnership structures, and VIEs, broadly defined as entities for which control is achieved through means other than voting rights. For voting interest entities, the interest holder with control through majority ownership and majority voting rights consolidates the entity. For VIEs, determination of the "primary beneficiary" drives the accounting. We identify the primary beneficiary of a VIE as the enterprise that has both (1) the power to direct the activities of the VIE that most significantly impact the entity's economic performance and (2) the obligation to absorb losses or receive benefits of the VIE that could potentially be significant to the VIE. We perform this analysis as of the inception of our investment and upon the occurrence of a reconsideration event. When we determine we are the primary beneficiary of a VIE, we consolidate the VIE; when we determine we are not the primary beneficiary of the VIE, we account for our investment in the VIE under the equity method or at fair value. If an entity is not a VIE, but is a limited partnership or similar entity, we apply guidance related to investments in joint ventures, and consider rights held by limited partners which may preclude consolidation by a sole general partner. The assessment of limited partners' rights and their impact on the presumption of control of the limited partnership by the sole general partner should be made when an investor becomes the general partner, and reassessed if (1) there is a change to the terms or in the exercisability of the rights of the limited partners, (2) the general partner increases or decreases its ownership of limited partnership interests, or (3) there is an increase or decrease in the number of outstanding limited partnership interests. Our determination of the appropriate accounting method to apply for all other investments is based on the level of influence we have in the underlying entity. When we have an asset advisory contract with a real estate limited partnership, the combination of our limited partner interest and the advisory agreement generally provides us with significant influence over such real estate limited partnership. Accordingly, we account for such investments either under the equity method or at fair value. We eliminate transactions with such subsidiaries to the extent of our ownership in such subsidiaries.
Use of Estimates	Use of Estimates The preparation of our Consolidated Financial Statements in conformity U.S. GAAP requires us to make estimates and assumptions about future events that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the dates of the financial statements and the reported amounts of revenue and expenses during the reporting periods. Such estimates include the value and allocation of purchase consideration, valuation of accounts receivable, investments in real estate ventures, goodwill, intangible assets, other long-lived assets, legal contingencies, assumptions used in the calculation of income taxes, incentive compensation, self-insurance program liabilities, and retirement and other post-employment benefits, among others. These estimates and assumptions are based on management's best estimate and judgment. We evaluate these estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment, which we believe to be reasonable under the circumstances. We adjust such estimates and assumptions when facts and circumstances dictate. Market factors, such as illiquid credit markets, volatile equity markets and foreign currency fluctuations can increase the uncertainty in such estimates and assumptions. Because future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in those estimates resulting from continuing changes in the economic environment will be reflected in the financial statements in future periods. Although actual amounts will likely differ from such estimated amounts, we believe such differences are not likely to be material.
Revenue Recognition	Revenue Recognition We earn revenue from the following principal sources: • Transaction commissions; • Advisory and management fees; • Incentive fees; • Project and development management fees; and • Construction management fees.
Revenue Recognition, Transaction Commissions	We recognize transaction commissions related to leasing services and capital markets services as revenue when we provide the related services unless future contingencies exist.
Revenue Recognition, Advisory and Management Fees	Advisory and management fees related to property and facility management services, valuation services, corporate property services, consulting services and investment management are recognized in the period in which we perform the related services.
Revenue Recognition, Incentive Fees	We recognize incentive fees in the period earned, based on the performance of funds' investments, contractual benchmarks and other contractual formulas.
Revenue Recognition, Project and Development Management and Construction Management Fees	We recognize project and development management and construction management fees by applying the percentage of completion method of accounting. The costs incurred to total estimated costs method is used to determine the extent of progress towards completion
Revenue Recognition, Gross and Net Accounting	Gross and Net Accounting We follow the guidance of the Financial Accounting Standards Board's ("FASB's") Accounting Standards Codification ("ASC") 605-45, Principal and Agent Considerations , when accounting for reimbursements received from clients. In certain of our businesses, primarily those involving management services, our clients reimburse us for expenses incurred on their behalf. We base the treatment of reimbursable expenses for financial reporting purposes upon the fee structure of the underlying contract. Accordingly, we report a contract that provides for fixed fees, fully inclusive of all personnel and other recoverable expenses, on a gross basis. When accounting on a gross basis, our reported revenue comprises the entire amount billed to our client and our reported expenses include all costs associated with the client. Certain contractual arrangements in our project and development services, including fit-out business activities and our facility management services, tend to have characteristics that result in accounting on a gross basis. In Note 3, Business Segments, for client assignments in property and facility management and in project and development services accounted for on a gross basis, we identify the reimbursable gross contract costs, including vendor and subcontractor costs ("gross contract costs"), and present separately their impact on both revenue and operating expense in our Real Estate Services ("RES") segments. We exclude these gross contract costs from revenue and operating expenses in determining "fee revenue" and "fee-based operating expenses" in our segment presentation. We account for a contract on a net basis when the fee structure is comprised of at least two distinct elements, namely (1) a fixed management fee and (2) a separate component that allows for scheduled reimbursable personnel costs or other expenses to be billed directly to the client. When accounting on a net basis, we include the fixed management fee in reported revenue and net the reimbursement against expenses. We base this accounting on the following factors, which define us as an agent rather than a principal: • The property owner or client, with ultimate approval rights relating to the employment and compensation of on-site personnel, and bearing all of the economic costs of such personnel, is determined to be the primary obligor in the arrangement; • Reimbursement to JLL is generally completed simultaneously with payment of payroll or soon thereafter; • The property owner is contractually obligated to fund all operating costs of the property from existing cash flow or direct funding from its building operating account and JLL bears little or no credit risk; and • JLL generally earns little to no margin on the reimbursement aspect of the arrangement, obtaining reimbursement only for actual costs incurred. We account for the majority of our service contracts on a net basis. The presentation of expenses pursuant to these arrangements under either a gross or net basis has no impact on operating income, net income or cash flows. Contracts accounted for on a gross basis resulted in certain reimbursable costs reflected in both revenue and operating expenses (gross contract costs) of $801.3 million , $727.9 million , and $434.8 million for the years ended December 31, 2015 , 2014 and 2013 , respectively.
Cash and Cash Equivalents	Cash and Cash Equivalents We consider all highly-liquid investments purchased with maturities of less than three months to be cash equivalents. The carrying amount of cash equivalents approximates fair value due to the short-term maturity of these investments.
Trade and Other Accounts Receivable	Financing Receivables We account for Trade receivables, Notes and other receivables, Long-term receivables and Warehouse receivables as financing receivables. Trade Receivables Pursuant to contractual arrangements, Trade receivables, net of allowances include unbilled amounts of $374.6 million and $339.1 million as of December 31, 2015 and 2014 , respectively. We estimate the allowance necessary to provide for uncollectible accounts receivable. The estimate includes specific amounts for which payment has become unlikely. We also base this estimate on historical experience combined with a review of current developments and client credit quality. The process by which we calculate the allowance begins with the individual business units where specific uncertain accounts are identified and reserved as part of an overall reserve that is formulaic and driven by the age profile of the receivables and our historical experience. We then review these allowances on a quarterly basis to ensure they are appropriate. The following table details the changes in the allowance for uncollectible receivables. ($ in millions) 2015 2014 2013 Allowance as of January 1, $ 17.9 18.8 19.5 Charged to income 14.5 8.2 8.7 Write-off of uncollectible receivables (8.7 ) (7.8 ) (8.5 ) Reserves acquired from acquisitions 0.3 0.9 — Impact of exchange rate movements and other (0.8 ) (2.2 ) (0.9 ) Allowance as of December 31, $ 23.2 17.9 18.8
Notes and Other Recievables and Long-Term Receivables [Policy Text Block]	Notes and Other Receivables and Long-Term Receivables We make ongoing assessments of the collectability of outstanding Notes and other receivables and Long-term receivables, considering both objective and subjective factors such as the age profile of outstanding balances, the contractual terms of repayment and credit quality. Aspects of credit quality considered in our assessments of collectability include historical experience, current developments and the status of our broader business relationship with the obligor. We record an allowance against the outstanding balance when our assessments result in a determination that payment has become unlikely. After all collection efforts have been exhausted by management, the outstanding balance considered uncollectible is written off against the reserve. Historically, credit quality deterioration to the point of impairment or non-performance in our Notes and other receivables and Long-term receivables has been limited and has not had a material impact on our Consolidated Financial Statements.
Warehouse Receivables and Facilities	Warehouse Receivables We originate mortgages upon receiving contractual purchase commitments from government-sponsored enterprises ("GSEs") such as the Federal National Mortgage Association ( Fannie Mae ), the Government National Mortgage Association ( Ginnie Mae ), and the Federal Home Loan Mortgage Corporation ( Freddie Mac ). Loans (hereinafter also referred to as Warehouse receivables) are generally funded by our warehouse facilities at prevailing market rates and repaid within a one-month period when the GSEs buy the loans, while we retain the servicing rights. We carry Warehouse receivables at the lower of cost or fair value based on the commitment price. Historically, we have not experienced any credit quality deterioration or balances considered uncollectible with respect to our warehouse receivables. Upon surrender of control over the warehouse receivables, we account for the transfer as a sale.
Mortgage Servicing Rights	Mortgage Servicing Rights We retain certain servicing rights in connection with the origination and sale of mortgage loans. We record mortgage servicing rights based on the fair value of these rights on the date the loans are sold, resulting in net gains, which we record as Revenue in our Consolidated Statements of Comprehensive Income. As of December 31, 2015 and 2014 , we had $163.0 million and $5.8 million , respectively, of mortgage servicing rights carried at the lower of amortized cost or fair value in Identified intangibles on our Consolidated Balance Sheets. The increase in the balance was primarily the result of a business acquisition during 2015. We amortize servicing rights in proportion to and over the estimated period that net servicing income is projected to be received. We evaluate mortgage servicing assets for impairment on an annual basis, or more frequently if circumstances or events indicate a change in fair value. There have been no instances of impairment during all periods presented. Mortgage servicing rights do not actively trade in an open market with readily available observable prices; therefore, if necessary, the fair value of these rights would be determined based on certain assumptions and judgments that are Level 3 within the fair value hierarchy, including the estimation of the present value of future cash flows to be realized from servicing the underlying mortgages.
Property and Equipment	Property and Equipment We record property and equipment at cost and depreciate these assets over their relevant useful lives. We capitalize certain direct costs relating to internal-use software development when incurred during the application development phase. We evaluate property and equipment for impairment whenever events or circumstances indicate the carrying value of an asset group may not be recoverable. We record an impairment loss to the extent the carrying value exceeds the estimated fair value. We did not recognize any significant impairment losses related to property and equipment during the years ended December 31, 2015 , 2014 or 2013 . We calculate depreciation and amortization on property and equipment for financial reporting purposes by using the straight-line method based on the estimated useful lives of our assets. Depreciation and amortization expense related to property and equipment for the years ended December 31, 2015 , 2014 and 2013 was $97.2 million , $84.2 million , and $71.0 million , respectively. The following table shows the gross value of major asset categories and the standard depreciable lives for each of these asset categories. December 31, ($ in millions) 2015 2014 Depreciable Life Furniture, fixtures and equipment $ 82.8 90.9 2 to 13 years Computer equipment and software 510.6 429.8 1 to 10 years Leasehold improvements 209.3 197.7 1 to 20 years Automobiles and other 69.8 68.3 4 to 30 years Total 872.5 786.7 Total accumulated depreciation 449.2 418.3 Net property and equipment $ 423.3 368.4
Business Combinations, Goodwill and Other Intangible Assets	Business Combinations, Goodwill and Other Intangible Assets We have historically grown, in part, through a series of acquisitions. Consistent with the services nature of the businesses we have acquired, we have recorded significant goodwill and intangible assets resulting from these acquisitions. These intangible assets are primarily comprised of management contracts and customer backlog we acquired as part of these acquisitions and amortize over their estimated useful lives. We evaluate goodwill for impairment at least annually. ASC Topic 350, Intangibles-Goodwill and Other , permits an entity to first assess qualitative factors to determine whether it is more likely than not the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test. We define our four reporting units as the three geographic regions of RES: Americas RES; Europe, Middle East and Africa ("EMEA") RES; and Asia Pacific RES, and LaSalle. We have considered both qualitative and quantitative factors with respect to the performance of our annual impairment test of goodwill and determined the fair value of our reporting units to be substantially in excess of the carrying value, primarily considering (1) our market capitalization in relation to the aggregate carrying value of our net assets, (2) our overall financial performance during the year at both the reporting unit and consolidated reporting levels, and (3) near and longer-term forecasts of operating income and cash flows generated by our reporting units in relation to the carrying values of the net assets of each reporting unit. In addition to our annual impairment evaluation, we evaluate whether events or circumstances have occurred in the period subsequent to our annual impairment testing that indicate it is more likely than not an impairment loss has occurred. It is possible our determination that goodwill for a reporting unit is not impaired could change in the future if current economic conditions deteriorate. We will continue to monitor the relationship between the Company's market capitalization and carrying value, as well as the ability of our reporting units to deliver current and projected EBITDA and cash flows sufficient to support the carrying values of the net assets of their respective businesses. We evaluate our Identified intangibles for impairment annually or if other events or circumstances indicate the carrying value may be impaired. See Note 4 for additional information on goodwill and other intangible assets.
Investments in Real Estate Ventures	Investments in Real Estate Ventures We invest in certain ventures that primarily own and operate commercial real estate across a wide array of sectors including retail, residential and office on a global basis. Historically, these investments have primarily been co-investments in funds our LaSalle business establishes in the ordinary course of business for its clients. These investments take the form of ownership interests generally ranging from less than 1% to 15% of the respective ventures and based upon investment-specific objectives, are typically formed with anticipated five to nine year investment periods. During the course of investment periods, in many instances the terms of the underlying investment agreements limit the transferability of the Company's ownership interests to distinct events or circumstances, the timing or existence of which cannot be estimated. When in place, such restrictions are a result of the Company's role beyond that of a passive investor, which generally means an advisory or management responsibility on behalf of the other investors who are typically clients of our LaSalle business. We primarily account for these investments under the equity method, however, as further discussed below, we report certain of our investments at fair value utilizing information provided by investees. For real estate limited partnerships in which the Company is a general partner, the entities are generally well-capitalized and grant the limited partners substantive participating rights, such as the right to replace the general partner without cause, to dissolve or liquidate the partnership, to approve the sale or refinancing of the principal partnership assets, or to approve the acquisition of principal partnership assets. We generally account for such general partner interests under the equity method or at fair value. For limited partnerships in which the Company is a limited partner, the Company has concluded it does not have a controlling interest in these limited partnerships. When we have an asset advisory contract with the limited partnership, the combination of our limited partner interest and the advisory agreement generally provides us with significant influence over the real estate limited partnership venture. Accordingly, we account for such investments under the equity method or at fair value. For investments in real estate ventures accounted for under the equity method, we maintain an investment account that is (1) increased by contributions made and by our share of net income earned by the real estate ventures, and (2) decreased by distributions received and by our share of net losses realized by the real estate ventures. Our share of each real estate venture's net income or loss, including gains and losses from capital transactions, is reflected in our Consolidated Statements of Comprehensive Income as Equity earnings from real estate ventures. See "Principles of Consolidation" above for additional discussion of the accounting for our co-investments. We review our investments in real estate ventures, except those investments otherwise reported at fair value, for indications of whether we may not be able to recover the carrying value of our investments and whether our investments are other than temporarily impaired. When events or changes in circumstances indicate the carrying amount of one of our investments may be other than temporarily impaired, we consider the likelihood of recoverability of the carrying amount of our investment as well as the estimated fair value and record an impairment charge as applicable. We consider a number of factors, including our share of co-investment cash flows and the fair value of our co-investments, in determining whether or not our investment is other than temporarily impaired. For investments in real estate ventures reported at fair value, we maintain an investment account that is increased or decreased each reporting period by the difference between the fair value of the investment and the carrying value as of the balance sheet date. These fair value adjustments are reflected as gains or losses in our Consolidated Statements of Comprehensive Income within Equity earnings from real estate ventures. The fair value of these investments as of the balance sheet date is determined generally using net asset value ("NAV") per share (or its equivalent), a Level 3 input in the fair value hierarchy, provided by the investee. Refer to Note 5 and Note 9 for additional information regarding investments reported at fair value. We report Equity earnings from real estate ventures in the Consolidated Statements of Comprehensive Income after Operating income. However, for segment reporting we reflect Equity earnings (losses) from real estate ventures as a component of revenue. See Note 3 for Equity earnings (losses) reflected within segment revenue, as well as discussion of how the Chief Operating Decision Maker (as defined in Note 3) measures segment results with Equity earnings (losses) included in segment revenue. See Note 5 for additional information on investments in real estate ventures.
Stock-Based Compensation	Stock-Based Compensation Stock-based compensation in the form of restricted stock units is a significant element of our compensation programs. We determine the fair value of restricted stock units based on the market price of the Company's common stock on the grant date and amortize it on a straight-line basis over the associated vesting period for each separately vesting portion of an award. We reduce stock-based compensation expense for estimated forfeitures each period and adjust expense accordingly upon vesting or actual forfeitures. We also have a "noncompensatory" Employee Stock Purchase Plan ("ESPP") for U.S. employees and a Jones Lang LaSalle Savings Related Share Option Plan ("Save As You Earn" or "SAYE") for U.K. employees. The fair value of options granted under the SAYE plan are determined on the grant date and amortized over the associated vesting period. See Note 6 for additional information on our stock compensation plans.
Income Taxes	Income Taxes We account for income taxes under the asset and liability method. We recognize deferred tax assets and liabilities for the expected future tax consequences of events that have been included in our financial statements or tax returns. Under this method, we determine deferred tax assets and liabilities based on the differences between the financial reporting and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. An increase or decrease in a deferred tax asset or liability that results from a change in circumstances, and that causes a change in our judgment about expected future tax consequences of events, would be included in the tax provision when the changes in circumstances and our judgment occurs. Deferred income taxes also reflect the impact of operating loss and tax credit carryforwards. A valuation allowance is established if we believe it is more likely than not all or some portion of a deferred tax asset will not be realized. An increase or decrease in a valuation allowance that results from a change in circumstances, and that causes a change in our judgment about the ability to realize the related deferred tax asset, would be included in the tax provision when the changes in circumstances and our judgment occurs. See Note 8 for additional information on income taxes.
Derivatives and Hedging Activities	Derivatives and Hedging Activities We do not enter into derivative financial instruments for trading or speculative purposes. However, in the normal course of business, we do use derivative financial instruments in the form of foreign currency forward contracts to manage our foreign currency exchange rate risk.
Foreign Currency Translation	Foreign Currency Translation We prepare the financial statements of our subsidiaries located outside the U.S. using local currency as the functional currency. The assets and liabilities of these subsidiaries are translated to U.S. dollars at the rates of exchange at the balance sheet date with the resulting translation adjustments included as a separate component of equity in the Consolidated Balance Sheets (Accumulated other comprehensive loss) and in the Consolidated Statements of Comprehensive Income (Other comprehensive income-foreign currency translation adjustments). See Note 15 for additional information on the components of Accumulated other comprehensive loss. Income and expenses are translated at the average monthly rates of exchange. We include gains and losses from foreign currency transactions in net earnings as a component of Operating, administrative and other expense. Net foreign currency losses were $2.0 million , $8.5 million , and $3.9 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. The effect of currency exchange rate changes on Cash and cash equivalents is presented as a separate caption in the Consolidated Statements of Cash Flows.
Cash Held for Others	Cash Held for Others We manage significant amounts of cash and cash equivalents in our role as agent for certain of our investment and property management clients. We do not include such amounts in our Consolidated Balance Sheets.
Taxes Collected from Clients and Remitted to Governmental Authorities	Taxes Collected from Clients and Remitted to Governmental Authorities We account for tax assessed by a governmental authority that is based on a revenue or transaction value (i.e., sales, use, and value added taxes) on a net basis, excluded from revenue, and recorded as current liabilities until paid.
Commitments and Contingencies	Commitments and Contingencies We are subject to various claims and contingencies related to lawsuits and taxes as well as commitments under contractual obligations. Many of these claims are covered under our current insurance programs, subject to deductibles. We recognize the liability associated with a loss contingency when a loss is probable and estimable. See Note 13 for additional information on commitments and contingencies.
Earnings Per Share; Net Income Available to Common Shareholders	Earnings Per Share; Net Income Available to Common Shareholders The difference between basic weighted average shares outstanding and diluted weighted average shares outstanding represents the dilutive impact of our common stock equivalents. Common stock equivalents consist of shares to be issued under employee stock compensation programs. See Note 6 for additional information on our stock compensation plans.

Organization (Tables)

Organization (Tables)	12 Months Ended
	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Revenue for Major Product Categories	The following table shows the revenue for the major product categories into which we group these services. Year Ended December 31, ($ in millions) 2015 2014 2013 Real Estate Services: Leasing $ 1,669.5 1,540.0 1,321.7 Capital Markets & Hotels 955.8 822.9 716.1 Property & Facility Management 1,557.4 1,523.7 1,199.5 Project & Development Services 882.1 709.3 555.4 Advisory, Consulting and Other 503.9 465.6 414.2 LaSalle Investment Management 397.0 368.1 254.7 Total revenue $ 5,965.7 5,429.6 4,461.6

Summary of Significant Accoun27

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Redeemable Noncontrolling Interest [Table Text Block]	Changes in amounts attributable to noncontrolling interests are reflected in the Consolidated Statements of Changes in Equity. Changes in amounts attributable to redeemable noncontrolling interests are presented in the following table. ($ in millions) Redeemable noncontrolling interests as of January 1, 2015 $ 13.4 Acquisition of redeemable noncontrolling interest (1) (2.8 ) Net income 1.6 Impact of exchange rate movements (1.1 ) Redeemable noncontrolling interests as of December 31, 2015 $ 11.1 (1) Reflects our redemption of a portion of the redeemable noncontrolling interest related to our 2014 acquisition of Tenzing AB and includes $0.2 million representing the difference between the redemption value and the carrying value of the acquired interest.
Changes in allowance for uncollectible receivables	The following table details the changes in the allowance for uncollectible receivables. ($ in millions) 2015 2014 2013 Allowance as of January 1, $ 17.9 18.8 19.5 Charged to income 14.5 8.2 8.7 Write-off of uncollectible receivables (8.7 ) (7.8 ) (8.5 ) Reserves acquired from acquisitions 0.3 0.9 — Impact of exchange rate movements and other (0.8 ) (2.2 ) (0.9 ) Allowance as of December 31, $ 23.2 17.9 18.8
Net property and equipment	The following table shows the gross value of major asset categories and the standard depreciable lives for each of these asset categories. December 31, ($ in millions) 2015 2014 Depreciable Life Furniture, fixtures and equipment $ 82.8 90.9 2 to 13 years Computer equipment and software 510.6 429.8 1 to 10 years Leasehold improvements 209.3 197.7 1 to 20 years Automobiles and other 69.8 68.3 4 to 30 years Total 872.5 786.7 Total accumulated depreciation 449.2 418.3 Net property and equipment $ 423.3 368.4

Business Segments (Tables)

Business Segments (Tables)	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Summary of financial information by business segment	Summarized financial information by business segment is as follows. Year Ended December 31, ($ in thousands) 2015 2014 2013 Real Estate Services Americas Revenue $ 2,605,556 2,319,136 1,918,092 Equity earnings 5,888 775 549 Total segment revenue 2,611,444 2,319,911 1,918,641 Gross contract costs (212,118 ) (210,380 ) (112,097 ) Total segment fee revenue 2,399,326 2,109,531 1,806,544 Operating expenses: Compensation, operating and administrative expenses 2,297,142 2,045,330 1,689,365 Depreciation and amortization 63,239 55,215 45,285 Total segment operating expenses 2,360,381 2,100,545 1,734,650 Gross contract costs (212,118 ) (210,380 ) (112,097 ) Total fee-based segment operating expenses 2,148,263 1,890,165 1,622,553 Operating income $ 251,063 219,366 183,991 EMEA Revenue $ 1,803,000 1,632,657 1,323,201 Equity earnings (losses) 752 17 (535 ) Total segment revenue 1,803,752 1,632,674 1,322,666 Gross contract costs (397,446 ) (316,440 ) (204,596 ) Total segment fee revenue 1,406,306 1,316,234 1,118,070 Operating expenses: Compensation, operating and administrative expenses 1,631,064 1,488,033 1,212,797 Depreciation and amortization 27,179 23,763 20,547 Total segment operating expenses 1,658,243 1,511,796 1,233,344 Gross contract costs (397,446 ) (316,440 ) (204,596 ) Total fee-based segment operating expenses 1,260,797 1,195,356 1,028,748 Operating income $ 145,509 120,878 89,322 Continued: Summarized financial information by business segment is as follows. Year Ended December 31, ($ in thousands) 2015 2014 2013 Real Estate Services Asia Pacific Revenue $ 1,159,979 1,109,701 965,626 Equity earnings 713 447 129 Total segment revenue 1,160,692 1,110,148 965,755 Gross contract costs (191,780 ) (201,073 ) (118,089 ) Total segment fee revenue 968,912 909,075 847,666 Operating expenses: Compensation, operating and administrative expenses 1,057,962 1,012,639 876,239 Depreciation and amortization 15,529 13,301 12,216 Total segment operating expenses 1,073,491 1,025,940 888,455 Gross contract costs (191,780 ) (201,073 ) (118,089 ) Total fee-based segment operating expenses 881,711 824,867 770,366 Operating income $ 87,201 84,208 77,300 LaSalle Revenue $ 397,136 368,109 254,672 Equity earnings 70,122 47,026 31,200 Total segment revenue 467,258 415,135 285,872 Operating expenses: Compensation, operating and administrative expenses 307,447 281,094 216,203 Depreciation and amortization 2,195 2,059 1,805 Total segment operating expenses 309,642 283,153 218,008 Operating income $ 157,616 131,982 67,864 Segment Reconciling Items Total segment revenue $ 6,043,146 5,477,868 4,492,934 Reclassification of equity earnings 77,475 48,265 31,343 Total revenue 5,965,671 5,429,603 4,461,591 Total segment operating expenses before restructuring and acquisition charges 5,401,757 4,921,434 4,074,457 Operating income before restructuring and acquisition charges 563,914 508,169 387,134 Restructuring and acquisition charges 34,116 42,505 18,315 Operating income $ 529,798 465,664 368,819
Reconciliation of segment identifiable assets and segment investments in real estate ventures to consolidated	The following table reconciles segment identifiable assets to consolidated assets and segment investments in real estate ventures to consolidated investments in real estate ventures. December 31, 2015 December 31, 2014 ($ in millions) IDENTIFIABLE ASSETS INVESTMENTS IN REAL ESTATE VENTURES IDENTIFIABLE ASSETS INVESTMENTS IN REAL ESTATE VENTURES Real Estate Services: Americas $ 3,192.8 9.4 $ 2,368.4 8.7 EMEA 1,486.7 1.0 1,328.6 3.1 Asia Pacific 901.2 3.8 775.1 4.4 LaSalle 513.9 297.3 476.2 280.9 Corporate 110.6 — 127.0 — Consolidated $ 6,205.2 311.5 $ 5,075.3 297.1
Reconciliation of segment property and equipment expenditures to consolidated	The following table reconciles segment property and equipment expenditures to consolidated property and equipment expenditures. Year Ended December 31, ($ in millions) 2015 2014 2013 Real Estate Services: Americas $ 55.5 62.9 47.0 EMEA 42.9 40.4 19.2 Asia Pacific 14.4 16.4 15.3 LaSalle 8.4 2.0 2.0 Corporate 27.9 35.2 27.3 Total capital expenditures 149.1 156.9 110.8 Less proceeds on dispositions — — (0.1 ) Net capital expenditures $ 149.1 156.9 110.7
Schedule of revenue and assets from most significant currencies	The following table sets forth the revenue and assets from our most significant currencies. TOTAL REVENUE TOTAL ASSETS Year Ended December 31, December 31, ($ in millions) 2015 2014 2013 2015 2014 United States dollar $ 2,536.4 2,214.1 1,954.3 $ 3,653.4 2,809.0 British pound 915.5 833.4 636.3 839.5 749.3 Euro 748.7 701.8 595.9 497.4 507.3 Australian dollar 303.0 303.1 285.3 212.1 158.6 Indian rupee 189.4 155.1 117.5 150.1 122.6 Hong Kong dollar 186.7 170.5 134.6 129.0 118.2 Chinese yuan 178.6 169.2 137.7 107.2 93.1 Japanese yen 170.0 155.1 122.0 53.1 44.1 Singapore dollar 123.2 157.7 96.7 123.1 124.8 Other currencies 614.2 569.6 381.3 440.3 348.3 $ 5,965.7 5,429.6 4,461.6 $ 6,205.2 5,075.3

Business Combinations, Goodwi29

Business Combinations, Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2015
Business Acquistion, Pro Forma Results [Line Items]
Business Acquistion, Pro Forma Results [Table Text Block]	These acquisitions are individually immaterial, but deemed material in aggregate. Our Consolidated Statements of Comprehensive In
Movements in Goodwill by Reporting Segment	The following table details, by reporting segment, the annual movements in goodwill with indefinite useful lives. Real Estate Services ($ in millions) Americas EMEA Asia Pacific LaSalle Consolidated Balance as of January 1, 2014 $ 995.2 647.6 237.9 19.4 1,900.1 Additions, net of adjustments 13.6 56.6 (0.7 ) — 69.5 Impact of exchange rate movements (0.5 ) (53.8 ) (6.4 ) (1.0 ) (61.7 ) Balance as of December 31, 2014 1,008.3 650.4 230.8 18.4 1,907.9 Additions, net of adjustments 153.7 92.7 41.9 — 288.3 Impact of exchange rate movements (0.9 ) (46.9 ) (6.1 ) (0.8 ) (54.7 ) Balance as of December 31, 2015 $ 1,161.1 696.2 266.6 17.6 2,141.5
Movements in Gross Carrying Amount and Accumulated Amortization of Finite-Lived Intangible Assets	The following table details, by reporting segment, the annual movements in the gross carrying amount and accumulated amortization of our identifiable intangibles. Real Estate Services ($ in millions) Americas EMEA Asia Pacific LaSalle Consolidated Gross Carrying Amount Balance as of January 1, 2014 $ 101.4 43.1 9.8 7.7 162.0 Additions 2.1 3.8 — — 5.9 Impact of exchange rate movements (0.1 ) (3.1 ) (0.3 ) (0.7 ) (4.2 ) Balance as of December 31, 2014 103.4 43.8 9.5 7.0 163.7 Additions 193.8 6.9 5.3 — 206.0 Impact of exchange rate movements (0.1 ) (2.2 ) (0.5 ) (0.7 ) (3.5 ) Balance as of December 31, 2015 $ 297.1 48.5 14.3 6.3 366.2 Accumulated Amortization Balance as of January 1, 2014 $ (78.2 ) (29.4 ) (8.7 ) (0.1 ) (116.4 ) Amortization expense (6.7 ) (3.9 ) (0.5 ) — (11.1 ) Impact of exchange rate movements — 2.3 0.3 — 2.6 Balance as of December 31, 2014 (84.9 ) (31.0 ) (8.9 ) (0.1 ) (124.9 ) Amortization expense (12.1 ) (3.8 ) (0.7 ) — (16.6 ) Impact of exchange rate movements — 2.2 0.3 — 2.5 Balance as of December 31, 2015 $ (97.0 ) (32.6 ) (9.3 ) (0.1 ) (139.0 ) Net book value as of December 31, 2015 $ 200.1 15.9 5.0 6.2 227.2
Future Amortization Expense for Finite-Lived Intangible Assets	estimated future amortization expense by year as of December 31, 2015 is presented in the following table. ($ in millions) 2016 $ 31.4 2017 29.9 2018 27.2 2019 23.9 2020 20.4 Thereafter 81.6 Total $ 214.4

Investments in Real Estate Ve30

Investments in Real Estate Ventures (Tables)	12 Months Ended
	Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]
Schedule of Equity Method Investments	The following table summarizes the above discussion relative to LIC II: ($ in millions) December 31, 2015 Our effective ownership interest in co-investment vehicle 48.78 % Our maximum potential unfunded commitments in LIC II $ 86.6 Our share of LIC II's unfunded capital commitments to underlying funds 50.3 Our share of exposure on outstanding borrowings 2.9 Our maximum exposure, assuming facility is fully drawn 9.8
Balance Sheet Amounts Consolidated for Variable Interest Entity [Table Text Block]	Summarized financial information for our consolidated VIEs is presented in the following tables. December 31, ($ in millions) 2015 2014 Property and equipment, net $ 32.6 37.8 Investments in real estate venture 6.6 5.0 Other assets 4.9 3.5 Total assets $ 44.1 46.3 Liabilities - Mortgage indebtedness $ 25.8 29.3 Members' equity 18.3 17.0 Total liabilities and members' equity $ 44.1 46.3
Comprehensive Income Amounts Consolidated for Variable Interest Entity [Table Text Block]	Year Ended December 31, ($ in millions) 2015 2014 2013 Revenue $ 8.5 4.2 1.0 Gain on sale of investments 1.4 — 2.9 Operating and other expenses (3.9 ) (3.9 ) (0.6 ) Net income $ 6.0 0.3 3.3
Summary of Combined Financial Information for Unconsolidated Ventures	The following tables summarize the combined financial information for our unconsolidated real estate ventures (including those held via LIC II) accounted for under either the equity method or at fair value. December 31, ($ in millions) 2015 2014 Balance Sheets: Investments in real estate, net of depreciation $ 12,216.7 10,060.4 Total assets 13,993.9 12,613.1 Mortgage indebtedness 4,345.9 3,979.2 Other borrowings 628.2 754.6 Total liabilities 5,608.3 5,487.1 Total equity $ 8,385.6 7,126.0 Year Ended December 31, ($ in millions) 2015 2014 2013 Statements of Operations: Revenue $ 1,473.6 1,397.6 1,605.2 Net income 1,179.5 1,099.1 906.2
Investments in real estate ventures	The below table shows the movement in our investments in real estate ventures reported at fair value. Year Ended December 31, ($ in millions) 2015 2014 2013 Fair value investments as of January 1, $ 113.6 78.9 63.6 Investments 33.8 35.2 16.8 Distributions (9.0 ) (3.1 ) (3.4 ) Net fair value gains 21.1 7.1 5.1 Foreign currency translation adjustments, net (4.3 ) (4.5 ) (3.2 ) Fair value investments as of December 31, $ 155.2 113.6 78.9

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Restricted Stock Unit Activity	Restricted stock unit activity is presented in the below table. Shares Weighted Average Weighted Average Unvested as of January 1, 2013 1,345.9 $ 68.50 Granted 244.4 91.01 Vested (522.8 ) 70.51 Forfeited (42.2 ) 62.38 Unvested as of December 31, 2013 1,025.3 73.09 2.03 Granted 160.5 119.88 Vested (426.6 ) 60.14 Forfeited (13.9 ) 80.74 Unvested as of December 31, 2014 745.3 90.43 2.38 Granted 186.3 159.30 Vested (196.4 ) 78.45 Forfeited (29.2 ) 94.20 Unvested as of December 31, 2015 706.0 111.78 2.03 Unvested shares expected to vest as of December 31, 2015 687.1 111.93 2.04
Share-Based Compensation Expense	Stock-based compensation expense is included within Compensation and benefits expense in our Consolidated Statements of Comprehensive Income. Stock-based compensation expense consisted of the following. Year Ended December 31, ($ in millions) 2015 2014 2013 Restricted stock unit awards $ 20.7 19.3 21.3 SAYE 2.1 1.1 1.0 Total $ 22.8 20.4 22.3
UK SAYE Options Granted	Options activity under the SAYE plan is presented in the following table. Year Ended December 31, (options in thousands) 2015 2014 Options granted 76 48 Exercise price - options granted $ 125.50 $ 105.54 Options exercised 82 79 Weighted average exercise price $ 58.84 $ 26.10

Retirement Plans (Tables)

Retirement Plans (Tables)	12 Months Ended
	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Net Periodic Pension Cost	The following table provides detail of Net periodic pension cost (benefit) for these four plans. Year Ended December 31, ($ in millions) 2015 2014 2013 Employer service cost - benefits earned during the period $ 4.7 3.7 3.9 Interest cost on projected benefit obligation 14.5 16.1 14.3 Expected return on plan assets (20.9 ) (24.5 ) (19.9 ) Net amortization of deferrals 4.3 1.0 2.1 Curtailment gain (0.4 ) — — Recognized actuarial loss 0.2 0.2 0.5 Net periodic pension cost (benefit) $ 2.4 (3.5 ) 0.9
Schedule of Net Funded Status	The following tables provide reconciliations of projected benefit obligations and plan assets (the net of which represents our funded status), as well as the funded status and accumulated benefit obligations, of our defined benefit pension plans. ($ in millions) Change in benefit obligation: 2015 2014 Projected benefit obligation, January 1, $ 427.2 358.2 Service cost 4.7 3.7 Interest cost 14.5 16.1 Curtailments (3.6 ) — Plan participants' contributions 0.4 0.6 Benefits paid (10.1 ) (8.2 ) Actuarial (gain) loss (49.6 ) 88.4 Changes in currency translation rates (23.0 ) (29.3 ) Other (2.0 ) (2.3 ) Projected benefit obligation, December 31, $ 358.5 427.2 Change in plan assets: 2015 2014 Fair value of plan assets, January 1, $ 414.3 383.1 Actual return on plan assets 16.3 33.7 Plan contributions 12.2 14.6 Benefits paid (10.1 ) (8.2 ) Changes in currency translation rates (23.4 ) (28.4 ) Other (24.4 ) 19.5 Fair value of plan assets, December 31, $ 384.9 414.3 Funded status and net amount recognized $ 26.4 (12.9 ) Accumulated benefit obligation, December 31, $ 357.3 423.7
Schedule of Amounts Recognized in Balance Sheet	Defined benefit pension plan amounts recorded in the Consolidated Balance Sheets are presented in the below table. December 31, ($ in millions) 2015 2014 Pension assets - included in Other long-term assets $ 30.5 8.0 Pension liabilities - included in Other long-term liabilities (4.1 ) (20.9 ) Net asset (liability) recognized $ 26.4 (12.9 ) Actuarial losses $ 59.0 91.6 Prior service costs 0.6 0.8 Accumulated other comprehensive loss $ 59.6 92.4
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]	The amounts recognized in Other comprehensive income are presented in the table below. Year Ended December 31, ($ in millions) 2015 2014 Current year actuarial (gains ) losses $ (25.2 ) 57.4 Reclassification adjustments included in Net periodic pension cost (4.1 ) (1.2 ) Change in currency translation rates (3.5 ) (2.4 ) Total $ (32.8 ) 53.8
Schedule of Assumptions Used	The ranges of assumptions we used in developing the projected benefit obligation as of December 31 are presented in the following table. 2015 2014 Discount rate used in determining present values 2.50% to 3.90% 2.25% to 3.70% Annual increase in future compensation levels 0.00% to 3.50% 0.00% to 3.50% The ranges of assumptions we used in determining net periodic cost (benefit) for the years ended December 31 are presented in the following table. 2015 2014 2013 Discount rate used in determining present values 2.25% to 3.70% 4.00% to 4.65% 3.50% to 4.70% Annual increase in future compensation levels 0.00% to 3.50% 0.00% to 3.85% 0.00% to 3.40% Expected long-term rate of return on assets 2.70% to 5.80% 4.10% to 7.00% 4.70% to 6.64%
Schedule of Allocation of Plan Assets	allocation of pension plan assets. December 31, 2015 December 31, 2014 ($ in millions) Level 1 Level 2 Level 3 Total % Level 1 Level 2 Level 3 Total % Equity securities: U.K. equities $ 46.9 15.8 — 62.7 16 % $ 45.2 14.9 — 60.1 15 % Non-U.K. equities 104.7 22.5 — 127.2 33 103.5 21.6 — 125.1 30 Debt securities: Corporate bonds 91.7 31.7 — 123.4 32 92.0 30.4 — 122.4 30 Government and other 7.4 11.6 — 19.0 5 8.0 12.1 — 20.1 5 Cash & cash equivalents 3.6 15.9 — 19.5 5 4.9 25.9 — 30.8 7 Other 1.2 9.4 22.5 33.1 9 1.5 5.5 48.8 55.8 13 Total $ 255.5 106.9 22.5 384.9 100 % $ 255.1 110.4 48.8 414.3 100 %
Schedule of Expected Benefit Payments	Additionally, pension benefit payments expected to be paid as of December 31, 2015 , which reflect expected future service, as appropriate, are presented in the following table. ($ in millions) Expected future minimum pension benefit payments 2016 $ 9.2 2017 9.4 2018 9.7 2019 9.9 2020 10.1 2021 to 2025 54.6 Total $ 102.9

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Provision for income taxes	Our provision for income taxes consisted of the following: Year Ended December 31, ($ in millions) 2015 2014 2013 U.S. Federal: Current $ 30.3 11.1 4.7 Deferred 17.8 30.3 11.9 $ 48.1 41.4 16.6 State and Local: Current $ 5.3 6.5 2.6 Deferred 1.9 0.3 (1.4 ) $ 7.2 6.8 1.2 International: Current $ 81.9 66.3 58.4 Deferred (4.4 ) (16.9 ) 15.9 $ 77.5 49.4 74.3 Total $ 132.8 97.6 92.1
Reconciliation of reported tax expense to federal statutory tax	Income tax expense differed from the amounts computed by applying the U.S. federal income tax rate of 35% to earnings before provision for income taxes as a result of the following: Year Ended December 31, ($ in millions) 2015 2014 2013 Income tax expense at statutory rates $ 202.7 35.0 % $ 170.0 35.0 % $ 127.9 35.0 % Increase (reduction) in income taxes from: State and local income taxes, net of federal income tax benefit 5.9 1.0 5.1 1.0 1.4 0.4 Amortization of goodwill and other intangibles (5.1 ) (0.9 ) (5.2 ) (1.1 ) (5.7 ) (1.6 ) Nondeductible expenses 5.4 0.9 5.1 1.0 2.1 0.6 International earnings taxed at various rates (57.0 ) (9.8 ) (59.1 ) (12.2 ) (38.9 ) (10.6 ) Valuation allowances (4.7 ) (0.8 ) 7.4 1.5 5.9 1.6 Recognition of tax benefit, net of nondeductible indemnification asset write-off (8.3 ) (1.4 ) (22.4 ) (4.6 ) — — Other, net (6.1 ) (1.1 ) (3.3 ) (0.5 ) (0.6 ) (0.2 ) Total $ 132.8 22.9 % $ 97.6 20.1 % $ 92.1 25.2 %
Income (loss) before taxes from domestic and international sources	Our income before taxes from domestic (U.S.) and international sources is presented in the following table. Year Ended December 31, ($ in millions) 2015 2014 2013 Domestic $ 132.1 111.2 102.8 International 447.0 374.4 262.6 Total $ 579.1 485.6 365.4
Tax effects of temporary differences that give rise to significant portions of deferred tax assets and liabilities	The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities are presented below. December 31, ($ in millions) 2015 2014 2013 Deferred tax assets attributable to: Accrued expenses $ 170.5 153.0 128.6 U.S. federal and state loss and credit carryovers 6.6 14.6 56.9 Allowances for uncollectible accounts 7.1 6.8 6.1 International loss carryovers 121.0 136.9 133.5 Investments in real estate ventures 26.9 33.6 38.8 Pension liabilities 12.6 20.0 9.2 Deferred tax assets 344.7 364.9 373.1 Less: valuation allowances (51.7 ) (62.0 ) (60.5 ) Net deferred tax assets $ 293.0 302.9 312.6 Deferred tax liabilities attributable to: Property and equipment $ 0.6 1.6 5.7 Intangible assets 123.9 101.7 91.7 Income deferred for tax purposes 2.2 1.6 2.2 Other 0.4 5.5 6.8 Deferred tax liabilities $ 127.1 110.4 106.4
Reconciliation of beginning and ending amount of unrecognized tax benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits is presented in the following table. ($ in millions) 2015 2014 Balance as of January 1 $ 48.5 81.1 Additions based on tax positions related to the current year 7.8 6.8 Decrease for the reversals of tax positions of prior years (11.2 ) (4.7 ) Reductions for use in settlements with taxing authorities — (0.2 ) Lapse of statute of limitations (16.8 ) (34.5 ) Balance as of December 31 $ 28.3 48.5

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following table categorizes by level in the fair value hierarchy the estimated fair value of our assets and liabilities measured at fair value on a recurring basis. December 31, 2015 2014 ($ in millions) Level 2 Level 3 Level 2 Level 3 Assets Foreign currency forward contracts receivable $ 9.5 — 10.5 — Deferred compensation plan assets 134.3 — 111.2 — Investments in real estate ventures - fair value — 155.2 — 113.6 Total assets at fair value $ 143.8 155.2 121.7 113.6 Liabilities Foreign currency forward contracts payable $ 21.2 — 18.2 — Deferred compensation plan liabilities 129.4 — 107.9 — Earn-out liabilities — 127.3 — 25.1 Total liabilities at fair value $ 150.6 127.3 126.1 25.1

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2015
Leases [Abstract]
Minimum Future Lease Payments	Minimum future lease payments (e.g., base rent for leases of office space) due in each of the next five years and thereafter, as of December 31, 2015 , are presented in the below table. ($ in millions) 2016 $ 143.5 2017 121.6 2018 104.4 2019 91.2 2020 75.3 Thereafter 226.6 Total $ 762.6

Transactions with Affiliates (T

Transactions with Affiliates (Tables)	12 Months Ended
	Dec. 31, 2015
Related Party Transactions [Abstract]
Outstanding Loans to Employees	The outstanding balance of loans to employees are presented in the following table. December 31, ($ in millions) 2015 2014 Loans related to co-investments (1) $ 13.4 8.6 Advances, travel and other (2) 126.7 75.0 Total $ 140.1 83.6 (1) These nonrecourse loans have been made to allow employees the ability to participate in investment fund opportunities. (2) Consists primarily of commissions and other compensation advances to employees that are amortized to Compensation and benefits based on performance over required service period

Commitments and Contingencies C

Commitments and Contingencies Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Schedule of Loss Contingencies by Contingency [Table Text Block]	The following table shows the professional indemnity reserve activity and related payments. ($ in millions) January 1, 2013 $ 1.6 New claims 5.7 Prior year claims adjustments (0.2 ) Claims paid (0.9 ) December 31, 2013 6.2 New claims 7.4 Prior year claims adjustments (0.8 ) Claims paid (3.6 ) December 31, 2014 9.2 New claims 2.9 Prior year claims adjustments 7.8 Claims paid (0.7 ) December 31, 2015 $ 19.2 Included in the professional indemnity reserve balances as of December 31, 2015 and 2014 are amounts we expect reimbursement from third-party insurers of $9.0 million and $1.8 million , respectively. The receivable balances are included in Notes and other receivables within the Consolidated Balance Sheets.

Restructuring and Acquisition38

Restructuring and Acquisition Charges (Tables)	12 Months Ended
	Dec. 31, 2015
Restructuring and Related Activities [Abstract]
Restructuring Charges and Related Payment Activity	The following table shows the restructuring and acquisition accrual activity and related payments and is exclusive of the indemnification asset write-offs and the adjustments to earn-out liabilities noted above. ($ in millions) Severance Retention Bonuses Lease Exit Other Acquisition Costs Total January 1, 2013 $ 10.0 5.2 12.0 4.2 31.4 Accruals 12.3 0.1 (1.4 ) 7.3 18.3 Payments made (18.5 ) (4.9 ) (4.7 ) (11.1 ) (39.2 ) December 31, 2013 3.8 0.4 5.9 0.4 10.5 Accruals 5.2 — 3.2 3.5 11.9 Payments made (6.0 ) (0.4 ) (4.9 ) (3.5 ) (14.8 ) December 31, 2014 3.0 — 4.2 0.4 7.6 Accruals 1.7 — 1.6 15.6 18.9 Payments made (2.0 ) — (0.1 ) (15.8 ) (17.9 ) December 31, 2015 $ 2.7 — 5.7 0.2 8.6

Accumulated Other Comprehensi39

Accumulated Other Comprehensive Income (Loss) by Component (Tables)	12 Months Ended
	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The table below presents the changes in Accumulated other comprehensive income (loss) by component. ($ in millions) Pension and postretirement benefit Cumulative foreign currency translation adjustment Total Balance as of January 1, 2014 $ (26.3 ) 1.1 (25.2 ) Other comprehensive loss before reclassification (38.1 ) (137.9 ) (176.0 ) Amounts reclassified from AOCI after tax expense of $0.2, $- and $0.2 1.0 — 1.0 Other comprehensive loss after tax benefit of $16.7, $- and $16.7 (37.1 ) (137.9 ) (175.0 ) Balance as of December 31, 2014 (63.4 ) (136.8 ) (200.2 ) Other comprehensive income (loss) before reclassification 24.3 (163.7 ) (139.4 ) Amounts reclassified from AOCI after tax expense of $0.8, $- and $0.8 3.3 — 3.3 Other comprehensive income (loss) after tax expense of $5.2, $- and $5.2 27.6 (163.7 ) (136.1 ) Balance as of December 31, 2015 $ (35.8 ) (300.5 ) (336.3 )

Quarterly Results of Operatio40

Quarterly Results of Operations (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information [Table Text Block]	JONES LANG LASALLE INCORPORATED QUARTERLY INFORMATION - 2015 (UNAUDITED) Quarter Ended Year Ended ($ in millions, except per share data) March 31, 2015 June 30, 2015 September 30, 2015 December 31, 2015 December 31, 2015 Revenue: Real Estate Services: Americas $ 554.5 598.0 643.9 815.0 2,611.4 EMEA 325.4 417.4 447.0 614.1 1,803.9 Asia Pacific 237.7 279.7 280.9 362.5 1,160.8 LaSalle Investment Management 97.2 105.5 154.9 109.5 467.1 Less: Equity earnings from real estate ventures 11.3 27.1 25.4 13.7 77.5 Total revenue 1,203.5 1,373.5 1,501.3 1,887.4 5,965.7 Operating expenses: Real Estate Services: Americas 519.1 552.0 582.3 706.9 2,360.3 EMEA 328.3 385.2 420.6 524.3 1,658.4 Asia Pacific 233.3 263.5 268.0 308.8 1,073.6 LaSalle Investment Management 69.3 68.0 92.0 80.2 309.5 Plus: Restructuring charges 0.8 1.8 18.1 13.4 34.1 Total operating expenses 1,150.8 1,270.5 1,381.0 1,633.6 5,435.9 Operating income 52.7 103.0 120.3 253.8 529.8 Net income attributable to common shareholders $ 41.9 90.1 110.5 195.9 438.4 Basic earnings per common share (1) $ 0.93 2.01 2.45 4.35 9.75 Diluted earnings per common share (1) $ 0.92 1.98 2.43 4.31 9.65 (1) Earnings per common share amounts are individually calculated for each quarter as well as the full annual period. As a result, quarterly earnings per common share do not sum to the total for the full year. JONES LANG LASALLE INCORPORATED QUARTERLY INFORMATION - 2014 (UNAUDITED) Quarter Ended Year Ended ($ in millions, except per share data) March 31, 2014 June 30, 2014 September 30, 2014 December 31, 2014 December 31, 2014 Revenue: Real Estate Services: Americas $ 447.3 545.1 581.7 745.9 2,320.0 EMEA 311.9 395.6 368.6 556.6 1,632.7 Asia Pacific 214.6 267.5 272.9 355.1 1,110.1 LaSalle Investment Management 72.5 81.5 162.4 98.7 415.1 Less: Equity earnings from real estate ventures 8.9 12.5 19.6 7.3 48.3 Total revenue 1,037.4 1,277.2 1,366.0 1,749.0 5,429.6 Operating expenses: Real Estate Services: Americas 430.3 498.3 533.6 638.3 2,100.5 EMEA 316.8 370.9 352.2 471.9 1,511.8 Asia Pacific 213.4 251.7 257.8 303.0 1,025.9 LaSalle Investment Management 56.2 59.2 94.9 72.9 283.2 Plus: Restructuring charges 36.0 5.4 — 1.1 42.5 Total operating expenses 1,052.7 1,185.5 1,238.5 1,487.2 4,963.9 Operating income (loss) (15.3 ) 91.7 127.5 261.8 465.7 Net income attributable to common shareholders $ 15.9 71.7 104.3 193.8 385.7 Basic earnings per common share $ 0.36 1.61 2.33 4.33 8.63 Diluted earnings per common share $ 0.35 1.58 2.30 4.29 8.52

Organization (Details)

Organization (Details) $ in Thousands, ft² in Billions	12 Months Ended
	Dec. 31, 2015USD ($)ft²employee	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of employees | employee	61,500
Number of employees whose costs are reimbursed by clients | employee	32,700
Portfolio of property and corporate facility management (in square feet) | ft²	4
Assets under management by LaSalle Investment Management	$ 56,400,000
Product Information [Line Items]
Revenue	5,965,671	$ 5,429,603	$ 4,461,591
Real Estate Services: Leasing [Member]
Product Information [Line Items]
Revenue	1,669,500	1,540,000	1,321,700
Real Estate Services: Capital Markets and Hotels [Member]
Product Information [Line Items]
Revenue	955,800	822,900	716,100
Real Estate Services: Property & Facilities Management [Member]
Product Information [Line Items]
Revenue	1,557,400	1,523,700	1,199,500
Real Estate Services: Project & Development Services [Member]
Product Information [Line Items]
Revenue	882,100	709,300	555,400
Real Estate Services: Advisory, Consulting and Other [Member]
Product Information [Line Items]
Revenue	503,900	465,600	414,200
LaSalle Investment Management [Member]
Product Information [Line Items]
Revenue	$ 397,000	$ 368,100	$ 254,700

Summary of Significant Accoun42

Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Redeemable Noncontrolling Interest	$ 11,083	$ 13,449
Redeemable Noncontrolling Interest, Acquisition Date Fair Value	(2,800)
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	1,560	1,187
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Noncontrolling Interest	(1,100)
Effect of Exchange Rate on Cash and Cash Equivalents	16,551	10,207	$ 2,068
Unrecognized Tax Benefits	28,300	48,500	81,100
Depreciation	97,200	84,200	71,000
Unbilled Contracts Receivable	374,600	339,100
Gross and Net Accounting [Abstract]
Gross revenue and expenses for management services	801,300	727,900	434,800
Mortgage servicing rights	$ 163,000	5,800
Investments in Real Estate Ventures [Abstract]
Minimum ownership percentage in real estate ventures (in hundredths)	1.00%
Maximum ownership percentage in real estate ventures (in hundredths)	15.00%
Unrealized gain on investments for which fair value option is elected	$ 21,100	7,100	5,100
Derivatives and Hedging Activities [Abstract]
Foreign currency forward contracts, net notional value	1,260,000	1,190,000
Foreign Currency Transaction Gain (Loss), Unrealized	(11,700)	(7,700)	(100)
Derivative, Notional Amount	2,280,000	2,030,000
Foreign Currency Translation [Abstract]
Accumulated other comprehensive loss	(336,313)	(200,239)
Net foreign currency gains (losses)	$ (2,000)	$ (8,500)	$ (3,900)

Summary of Significant Accoun43

Summary of Significant Accounting Policies, Accounts Receivable (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts Receivable, Net [Abstract]
Unbilled contracts receivable	$ 374.6	$ 339.1
Allowance for Doubtful Accounts, Current [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Allowance at beginning of the year	17.9	18.8	$ 19.5
Charged to income	14.5	8.2	8.7
Write-off of uncollectible receivables	(8.7)	(7.8)	(8.5)
Reserves acquired from acquisitions	0.3	0.9	0
Impact of exchange rate movements and other	(0.8)	(2.2)	(0.9)
Allowance at end of the year	$ 23.2	$ 17.9	$ 18.8

Summary of Significant Accoun44

Summary of Significant Accounting Policies, Warehouse Receivables and Facilities (Details) $ in Millions	Dec. 31, 2015USD ($)
Line of Credit Facility [Line Items]
Restricted Cash and Cash Equivalents	$ 75.6

Summary of Significant Accoun45

Summary of Significant Accounting Policies, Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property and Equipment [Abstract]
Depreciation expense	$ 97,200	$ 84,200	$ 71,000
Mortgage servicing rights	163,000	5,800
Property, Plant and Equipment [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	177
Property and equipment, gross value	872,500	786,700
Total accumulated depreciation	(449,204)	(418,332)
Net property and equipment	423,268	368,361
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross value	$ 82,800	90,900
Furniture and Fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	2 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	13 years
Computer equipment and software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross value	$ 510,600	429,800
Computer equipment and software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	1 year
Computer equipment and software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	10 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross value	$ 209,300	197,700
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	1 year
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	20 years
Automobiles [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross value	$ 69,800	$ 68,300
Automobiles [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	4 years
Automobiles [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable life	30 years

Business Segments (Details)

Business Segments (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015USD ($)region	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Sep. 30, 2014USD ($)	Jun. 30, 2014USD ($)	Mar. 31, 2014USD ($)	Dec. 31, 2015USD ($)segmentregion	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Segment Reporting [Abstract]
Number of business segments | segment									4
Number of geographic regions of Real Estate Services | region	3								3
Percentage of assets from countries having restrictions									5.00%	5.00%
Segment revenue:
Revenue									$ 5,965,671	$ 5,429,603	$ 4,461,591
Equity in earnings (losses)	$ 13,700	$ 25,400	$ 27,100	$ 11,300	$ 7,300	$ 19,600	$ 12,500	$ 8,900	77,475	48,265	31,343
Segment Reporting Information, Revenue for Reportable Segment									6,043,146	5,477,868	4,492,934
Total segment fee revenue	1,887,400	1,501,300	1,373,500	1,203,500	1,749,000	1,366,000	1,277,200	1,037,400
Operating expenses:
Depreciation and amortization									108,142	94,337	79,853
Total operating expenses	1,633,600	1,381,000	1,270,500	1,150,800	1,487,200	1,238,500	1,185,500	1,052,700	5,435,873	4,963,939	4,092,772
Operating income	253,800	120,300	103,000	52,700	261,800	127,500	91,700	(15,300)	529,798	465,664	368,819
Segment Reconciling Items:
Total segment revenue									5,965,671	5,429,603	4,461,591
Equity in earnings (losses)	13,700	25,400	27,100	11,300	7,300	19,600	12,500	8,900	77,475	48,265	31,343
Revenue									5,965,671	5,429,603	4,461,591
Total segment operating expenses before restructuring and acquisition charges									5,401,757	4,921,434	4,074,457
Operating income before restructuring and acquisition charges									563,914	508,169	387,134
Restructuring and acquisition charges	13,400	18,100	1,800	800	1,100	0	5,400	36,000	34,116	42,505	18,315
Operating income	253,800	120,300	103,000	52,700	261,800	127,500	91,700	(15,300)	529,798	465,664	368,819
Reportable Subsegments [Member] | Americas [Member]
Segment revenue:
Revenue									2,605,556	2,319,136	1,918,092
Equity in earnings (losses)									5,888	775	549
Segment Reporting Information, Revenue for Reportable Segment	815,000	643,900	598,000	554,500	745,900	581,700	545,100	447,300	2,611,444	2,319,911	1,918,641
Gross contract costs									(212,118)	(210,380)	(112,097)
Total segment fee revenue									2,399,326	2,109,531	1,806,544
Operating expenses:
Compensation, operating and administrative expenses									2,297,142	2,045,330	1,689,365
Depreciation and amortization									63,239	55,215	45,285
Total operating expenses	706,900	582,300	552,000	519,100	638,300	533,600	498,300	430,300	2,360,381	2,100,545	1,734,650
Gross contract costs									(212,118)	(210,380)	(112,097)
Total fee based segment operating expenses									2,148,263	1,890,165	1,622,553
Operating income									251,063	219,366	183,991
Segment Reconciling Items:
Total segment revenue									2,605,556	2,319,136	1,918,092
Equity in earnings (losses)									5,888	775	549
Revenue									2,605,556	2,319,136	1,918,092
Operating income									251,063	219,366	183,991
Reportable Subsegments [Member] | EMEA [Member]
Segment revenue:
Revenue									1,803,000	1,632,657	1,323,201
Equity in earnings (losses)									752	17	(535)
Segment Reporting Information, Revenue for Reportable Segment	614,100	447,000	417,400	325,400	556,600	368,600	395,600	311,900	1,803,752	1,632,674	1,322,666
Gross contract costs									(397,446)	(316,440)	(204,596)
Total segment fee revenue									1,406,306	1,316,234	1,118,070
Operating expenses:
Compensation, operating and administrative expenses									1,631,064	1,488,033	1,212,797
Depreciation and amortization									27,179	23,763	20,547
Total operating expenses	524,300	420,600	385,200	328,300	471,900	352,200	370,900	316,800	1,658,243	1,511,796	1,233,344
Gross contract costs									(397,446)	(316,440)	(204,596)
Total fee based segment operating expenses									1,260,797	1,195,356	1,028,748
Operating income									145,509	120,878	89,322
Segment Reconciling Items:
Total segment revenue									1,803,000	1,632,657	1,323,201
Equity in earnings (losses)									752	17	(535)
Revenue									1,803,000	1,632,657	1,323,201
Operating income									145,509	120,878	89,322
Reportable Subsegments [Member] | Asia Pacific [Member]
Segment revenue:
Revenue									1,159,979	1,109,701	965,626
Equity in earnings (losses)									713	447	129
Segment Reporting Information, Revenue for Reportable Segment	362,500	280,900	279,700	237,700	355,100	272,900	267,500	214,600	1,160,692	1,110,148	965,755
Gross contract costs									(191,780)	(201,073)	(118,089)
Total segment fee revenue									968,912	909,075	847,666
Operating expenses:
Compensation, operating and administrative expenses									1,057,962	1,012,639	876,239
Depreciation and amortization									15,529	13,301	12,216
Total operating expenses	308,800	268,000	263,500	233,300	303,000	257,800	251,700	213,400	1,073,491	1,025,940	888,455
Gross contract costs									(191,780)	(201,073)	(118,089)
Total fee based segment operating expenses									881,711	824,867	770,366
Operating income									87,201	84,208	77,300
Segment Reconciling Items:
Total segment revenue									1,159,979	1,109,701	965,626
Equity in earnings (losses)									713	447	129
Revenue									1,159,979	1,109,701	965,626
Operating income									87,201	84,208	77,300
LaSalle [Member]
Segment revenue:
Revenue									397,136	368,109	254,672
Equity in earnings (losses)									70,122	47,026	31,200
Segment Reporting Information, Revenue for Reportable Segment	109,500	154,900	105,500	97,200	98,700	162,400	81,500	72,500	467,258	415,135	285,872
Operating expenses:
Compensation, operating and administrative expenses									307,447	281,094	216,203
Depreciation and amortization									2,195	2,059	1,805
Total operating expenses	$ 80,200	$ 92,000	$ 68,000	$ 69,300	$ 72,900	$ 94,900	$ 59,200	$ 56,200	309,642	283,153	218,008
Operating income									157,616	131,982	67,864
Segment Reconciling Items:
Total segment revenue									397,136	368,109	254,672
Equity in earnings (losses)									70,122	47,026	31,200
Revenue									397,136	368,109	254,672
Operating income									$ 157,616	$ 131,982	$ 67,864

Business Segments, Assets (Deta

Business Segments, Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	$ 6,205,159	$ 5,075,336
Investments In Real Estate Ventures	311,487	297,142
Reportable Subsegments [Member] | Americas [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	3,192,800	2,368,400
Investments In Real Estate Ventures	9,400	8,700
Reportable Subsegments [Member] | EMEA [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	1,486,700	1,328,600
Investments In Real Estate Ventures	1,000	3,100
Reportable Subsegments [Member] | Asia Pacific [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	901,200	775,100
Investments In Real Estate Ventures	3,800	4,400
LaSalle [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	513,900	476,200
Investments In Real Estate Ventures	297,300	280,900
Corporate [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable Assets	110,600	127,000
Investments In Real Estate Ventures	$ 0	$ 0

Business Segments, Property and

Business Segments, Property and Equipment Expenditures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property and equipment expenditures [Abstract]
Total Capital Expenditures	$ 149,100	$ 156,900	$ 110,800
Less proceeds on dispositions	0	0	(100)
Net capital expenditures	149,076	156,927	110,684
Reportable Subsegments [Member] | Americas [Member]
Property and equipment expenditures [Abstract]
Total Capital Expenditures	55,500	62,900	47,000
Reportable Subsegments [Member] | EMEA [Member]
Property and equipment expenditures [Abstract]
Total Capital Expenditures	42,900	40,400	19,200
Reportable Subsegments [Member] | Asia Pacific [Member]
Property and equipment expenditures [Abstract]
Total Capital Expenditures	14,400	16,400	15,300
LaSalle [Member]
Property and equipment expenditures [Abstract]
Total Capital Expenditures	8,400	2,000	2,000
Corporate [Member]
Property and equipment expenditures [Abstract]
Total Capital Expenditures	$ 27,900	$ 35,200	$ 27,300

Business Segments, Currencies (

Business Segments, Currencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Significant Currencies [Line Items]
Total segment revenue	$ 5,965,671	$ 5,429,603	$ 4,461,591
Total Assets	6,205,159	5,075,336
United States dollar [Member]
Schedule of Significant Currencies [Line Items]
Total segment revenue	2,536,400	2,214,100	1,954,300
Total Assets	3,653,400	2,809,000
British pound [Member]
Schedule of Significant Currencies [Line Items]
Total segment revenue	915,500	833,400	636,300
Total Assets	839,500	749,300
Euro [Member]
Schedule of Significant Currencies [Line Items]
Total segment revenue	748,700	701,800	595,900
Total Assets	497,400	507,300
Australian dollar [Member]
Schedule of Significant Currencies [Line Items]
Total segment revenue	303,000	303,100	285,300
Total Assets	212,100	158,600
Indian rupee [Member]
Schedule of Significant Currencies [Line Items]
Total segment revenue	189,400	155,100	117,500
Total Assets	150,100	122,600
Hong Kong dollar [Member]
Schedule of Significant Currencies [Line Items]
Total segment revenue	186,700	170,500	134,600
Total Assets	129,000	118,200
Chinese yuan [Member]
Schedule of Significant Currencies [Line Items]
Total segment revenue	178,600	169,200	137,700
Total Assets	107,200	93,100
Japanese yen [Member]
Schedule of Significant Currencies [Line Items]
Total segment revenue	170,000	155,100	122,000
Total Assets	53,100	44,100
Singapore dollar [Member]
Schedule of Significant Currencies [Line Items]
Total segment revenue	123,200	157,700	96,700
Total Assets	123,100	124,800
Other currencies [Member]
Schedule of Significant Currencies [Line Items]
Total segment revenue	614,200	569,600	$ 381,300
Total Assets	$ 440,300	$ 348,300

Business Combinations, Goodwi50

Business Combinations, Goodwill and Other Intangible Assets, Business Combinations Activity (Details)	12 Months Ended
	Dec. 31, 2015USD ($)acquisition	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Business Acquisition [Line Items]
Number of Businesses Acquired | acquisition	20
Payments to acquire businesses, net of cash acquired	$ 373,000,000
Business Combinations, Guaranteed Deferred Acquisition Obligation	23,131,000	$ 21,486,000	$ 13,195,000
Contingent Consideration Earn-Out, Fair Value	105,091,000	10,296,000	$ 9,215,000
Goodwill, acquired during period	280,800,000
Identifiable Assets Acquired, Finite-Lived Intangibles	200,600,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	19,800,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	134,500,000
Business Acquisition, Pro Forma Revenue	6,193	5,720.1
Business Acquisition, Pro Forma Net Income (Loss)	456,200	404,300
Minority Shareholder Redemption Liability, Current	0	11,158,000
Minority Shareholder Redemption Liability, Increase (Decrease)	5,500,000
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	177,000
Deferred acquisition obligations paid	51,800,000	39,300,000
Payments for Repurchase of Redeemable Noncontrolling Interest	2,700,000
Goodwill Additions, net of adjustments	288,300,000	69,500,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount	104,100,000	$ 13,600,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage		95.00%	90.00%
Cash Paid For New Acquisitions And Contingent Earn Out Consideration	391,594,000	$ 38,196,000	$ 57,544,000
Redeemable Noncontrolling Interest, Acquisition Date Fair Value	0	$ 14,186,000	$ 0
Maximum amount of the potential earn-out payments	$ 230,400,000
Number of acquisitions subject to potential earn-out payments provisions | acquisition	28
INDIA
Business Acquisition [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	$ 16,400,000

Business Combinations, Goodwi51

Business Combinations, Goodwill and Other Intangible Assets, Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Minority Shareholder Redemption Liability, Current	$ 0	$ 11,158
Unamortized intangibles and goodwill	2,368,700
Finite-Lived Intangible Assets, Net	214,400
Indefinite-Lived Intangible Assets (Excluding Goodwill)	12,800
Goodwill [Roll Forward]
Goodwill	1,907,924	1,900,100
Additions, net of adjustments	288,300	69,500
Impact of exchange rate movements	(54,700)	(61,700)
Goodwill	2,141,471	1,907,924
LaSalle [Member]
Goodwill [Roll Forward]
Goodwill	18,400	19,400
Additions, net of adjustments	0	0
Impact of exchange rate movements	(800)	(1,000)
Goodwill	17,600	18,400
Americas [Member] | Reportable Subsegments [Member]
Goodwill [Roll Forward]
Goodwill	1,008,300	995,200
Additions, net of adjustments	153,700	13,600
Impact of exchange rate movements	(900)	(500)
Goodwill	1,161,100	1,008,300
EMEA [Member] | Reportable Subsegments [Member]
Goodwill [Roll Forward]
Goodwill	650,400	647,600
Additions, net of adjustments	92,700	56,600
Impact of exchange rate movements	(46,900)	(53,800)
Goodwill	696,200	650,400
Asia Pacific [Member] | Reportable Subsegments [Member]
Goodwill [Roll Forward]
Goodwill	230,800	237,900
Additions, net of adjustments	41,900	(700)
Impact of exchange rate movements	(6,100)	(6,400)
Goodwill	$ 266,600	$ 230,800

Business Combinations, Goodwi52

Business Combinations, Goodwill and Other Intangible Assets, Other Intangibles by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]
Identified intangibles, with finite useful lives, accumulated amortization, gross carrying amount	$ 366,200	$ 163,700	$ 162,000
Additions	206,000	5,900
Impact of exchange rate movements	(3,500)	(4,200)
Identified intangibles, with finite useful lives, accumulated amortization	(139,023)	(124,920)	(116,400)
Amortization expense	(16,600)	(11,100)
Impact of exchange rate movements	2,500	2,600
Net book value as of end of period	$ 227,185	38,841
Remaining amortization period	4 years 3 months 18 days
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
2,016	$ 31,400
2,017	29,900
2,018	27,200
2,019	23,900
2,020	20,400
Thereafter	81,600
Total	214,400
Reportable Subsegments [Member] | Americas [Member]
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]
Identified intangibles, with finite useful lives, accumulated amortization, gross carrying amount	297,100	103,400	101,400
Additions	193,800	2,100
Impact of exchange rate movements	(100)	(100)
Identified intangibles, with finite useful lives, accumulated amortization	(97,000)	(84,900)	(78,200)
Amortization expense	(12,100)	(6,700)
Impact of exchange rate movements	0	0
Net book value as of end of period	200,100
Reportable Subsegments [Member] | EMEA [Member]
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]
Identified intangibles, with finite useful lives, accumulated amortization, gross carrying amount	48,500	43,800	43,100
Additions	6,900	3,800
Impact of exchange rate movements	(2,200)	(3,100)
Identified intangibles, with finite useful lives, accumulated amortization	(32,600)	(31,000)	(29,400)
Amortization expense	(3,800)	(3,900)
Impact of exchange rate movements	2,200	2,300
Net book value as of end of period	15,900
Reportable Subsegments [Member] | Asia Pacific [Member]
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]
Identified intangibles, with finite useful lives, accumulated amortization, gross carrying amount	14,300	9,500	9,800
Additions	5,300	0
Impact of exchange rate movements	(500)	(300)
Identified intangibles, with finite useful lives, accumulated amortization	(9,300)	(8,900)	(8,700)
Amortization expense	(700)	(500)
Impact of exchange rate movements	300	300
Net book value as of end of period	5,000
LaSalle [Member]
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items]
Identified intangibles, with finite useful lives, accumulated amortization, gross carrying amount	6,300	7,000	7,700
Additions	0	0
Impact of exchange rate movements	(700)	(700)
Identified intangibles, with finite useful lives, accumulated amortization	(100)	(100)	$ (100)
Amortization expense	0	0
Impact of exchange rate movements	0	$ 0
Net book value as of end of period	$ 6,200

Investments in Real Estate Ve53

Investments in Real Estate Ventures (Details)	12 Months Ended
	Dec. 31, 2015USD ($)investment	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Schedule of Equity Method Investments [Line Items]
Number of separate property or fund co-investments | investment	50
Minimum ownership percentage in real estate ventures (in hundredths)	1.00%
Maximum ownership percentage in real estate ventures (in hundredths)	15.00%
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 103,200,000
Total segment revenue	5,965,671,000	$ 5,429,603,000	$ 4,461,591,000
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	446,341,000	388,020,000	273,352,000
Property and equipment	423,268,000	368,361,000
Investments In Real Estate Ventures	311,487,000	297,142,000
Total Assets	6,205,159,000	5,075,336,000
Mortgage loans payable	208,496,000	118,969,000
Liabilities	3,475,777,000	2,652,767,000
Liabilities and Equity	6,205,159,000	5,075,336,000
Balance Sheet [Abstract]
Investments in real estate, net of depreciation	12,216,700	10,060,400
Total assets	13,993,900	12,613,100
Mortgage indebtedness	4,345,900	3,979,200
Other borrowings	628,200	754,600
Total liabilities	5,608,300	5,487,100
Total equity	8,385,600	7,126,000
Statements of Operations [Abstract]
Revenue	1,473,600	1,397,600	1,605,200
Net income (loss)	1,179,500	1,099,100	906,200
Impairment [Abstract]
Impairment charges	6,000,000	2,400,000	6,500,000
Fair Value [Abstract]
Fair value investments at beginning of the period	113,600,000	78,900,000	63,600,000
Investments	33,800,000	35,200,000	16,800,000
Distributions	(9,000,000)	(3,100,000)	(3,400,000)
Net fair value gain	21,100,000	7,100,000	5,100,000
Foreign currency translation adjustments, net	(4,300,000)	(4,500,000)	(3,200,000)
Fair value investments at end of the period	155,200,000	113,600,000	78,900,000
LaSalle Investment Company II [Member]
Schedule of Equity Method Investments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	86,600,000
Unfunded capital commitments to the underlying funds for future funding of co-investments	$ 103,200,000
Maximum expected period for vehicle to draw down on commitment	5 years
Line of credit facility, maximum borrowing capacity	$ 20,000,000
Loss contingency, range of possible loss, maximum	9,800,000
Variable Interest Entity, reporting entity involvement, maximum loss exposure, amount	$ 86,600,000
Summary of equity method investments [Abstract]
Our effective ownership interest in co-investment vehicle	48.78%
Entity share of Unfunded Capital Commitments for Future Fundings	$ 50,300,000
Our maximum exposure assuming facilities are fully drawn	9,800,000
Our share of exposure on outstanding borrowings	2,900,000
Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member]
Fair Value [Abstract]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net	2,100,000	4,300,000
Consolidated Variable Interest Entities [Member]
Schedule of Equity Method Investments [Line Items]
Total segment revenue	8,500,000	4,200,000	1,000,000
Gains on Sales of Investment Real Estate	1,400,000	0	2,900,000
Other Expenses	(3,900,000)	(3,900,000)	(600,000)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	6,000,000	300,000	$ 3,300,000
Property and equipment	32,600,000	37,800,000
Investments In Real Estate Ventures	6,600,000	5,000,000
Other Assets	4,900,000	3,500,000
Total Assets	44,100,000	46,300,000
Mortgage loans payable	25,800,000	29,300,000
Members' Equity	18,300,000	17,000,000
Liabilities and Equity	$ 44,100,000	$ 46,300,000

Stock-Based Compensation (Detai

Stock-Based Compensation (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015USD ($)yr$ / sharesshares	Dec. 31, 2014USD ($)$ / sharesshares	Dec. 31, 2013USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense | $	$ 22.8	$ 20.4	$ 22.3
Minimum percentage of incentive compensation required to be delivered in restricted stock units	10.00%
Maximum percentage of incentive compensation required to be delivered in restricted stock units	20.00%
Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)	800,000
Sum of age plus years of service, minimum (in years) | yr	65
Stock Options [Member] | U.K. Save As You Earn (SAYE) Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)	425,000
Allocated share-based compensation expense | $	$ 2.1	$ 1.1	1
Other Stock Compensation Programs [Abstract]
Options granted (in shares)	76,000	48,000
Exercise price - options granted (in dollars per share) | $ / shares	$ 125.50	$ 105.54
Options exercised (in shares)	82,000	79,000
Weighted average exercise price (in dollars per share) | $ / shares	$ 58.84	$ 26.10
Restricted Stock Units (RSUs) [Member] | Stock Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense | $	$ 20.7	$ 19.3	$ 21.3
Employee Stock Ownership Plan [Member]
Restricted stock unit activity [Roll Forward]
Granted (in shares)	365,000
Restricted Stock Units (RSUs) [Member]
Restricted stock unit activity [Roll Forward]
Unvested at beginning of period (in shares)	745,300	1,025,300	1,345,900
Granted (in shares)	186,300	160,500	244,400
Vested (in shares)	(196,400)	(426,600)	(522,800)
Forfeited (in shares)	(29,200)	(13,900)	(42,200)
Unvested at end of period (in shares)	706,000	745,300	1,025,300
Unvested shares expected to vest (in shares)	687,100
Restricted stock unit activity, additional disclosures [Abstract]
Weighted average grant date fair value, beginning of period (in dollars per share) | $ / shares	$ 90.43	$ 73.09	$ 68.50
Weighted average grant date fair value, granted (in dollars per share) | $ / shares	159.30	119.88	91.01
Weighted average grant date fair value, vested (in dollars per share) | $ / shares	78.45	60.14	70.51
Weighted average grant date fair value, forfeited (in dollars per share) | $ / shares	94.20	80.74	62.38
Weighted average grant date fair value, end of period (in dollars per share) | $ / shares	111.78	$ 90.43	$ 73.09
Weighted average grant date fair value, unvested shares expected to vest (in dollars per share) | $ / shares	$ 111.93
Weighted average remaining contractual life, unvested shares outstanding and expected to vest	2 years 10 days	2 years 4 months 18 days	2 years 11 days
Weighted average remaining contractual life, unvested shares expected to vest	2 years 14 days
Unamortized deferred compensation cost | $	$ 30.7
Fair value of shares vested | $	15.4	$ 25.7	$ 36.9
Grant date fair value | $	$ 29.7	$ 19.2	$ 22.2
Stock Options [Member] | Jones Lang Lasalle Savings Related Share Option Plan [Member]
Other Stock Compensation Programs [Abstract]
Discount on purchase price (in hundredths)	15.00%
Options outstanding (in shares)	156,000	176,000
Stock Options [Member] | Three year vesting [Member] | Jones Lang Lasalle Savings Related Share Option Plan [Member]
Other Stock Compensation Programs [Abstract]
Options to purchase discounted stock, vesting period (in years)	3 years
Stock Options [Member] | Five year vesting [Member] | Jones Lang Lasalle Savings Related Share Option Plan [Member]
Other Stock Compensation Programs [Abstract]
Options to purchase discounted stock, vesting period (in years)	5 years

Retirement Plans (Details)

Retirement Plans (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015USD ($)plan	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Defined Benefit Plan Disclosure [Line Items]
Contributory defined benefit pension plans | plan	4
Net periodic pension cost [Abstract]
Employer service cost - benefits earned during the period	$ 4.7	$ 3.7	$ 3.9
Interest cost on projected benefit obligation	14.5	16.1	14.3
Expected return on plan assets	(20.9)	(24.5)	(19.9)
Net amortization of deferrals	(4.3)	(1)	(2.1)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments	0.4	0	0
Recognized actuarial loss	0.2	0.2	0.5
Net periodic pension cost (benefit)	2.4	(3.5)	0.9
Change in benefit obligation:
Service cost	4.7	3.7	3.9
Interest cost	14.5	16.1	14.3
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Accumulated other comprehensive income yet to be recognized as components of net periodic pension cost, prior service cost	0.6	0.8
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax	(25.2)	57.4
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax	(4.1)	(1.2)
other comprehensive income loss pension plans adjustment, foreign currency exchange rate changes	(3.5)	(2.4)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax	(32.8)	53.8
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent	30.5	8
Net periodic pension cost [Abstract]
Employer service cost - benefits earned during the period	4.7	3.7
Interest cost on projected benefit obligation	14.5	16.1
Change in benefit obligation:
Projected benefit obligations, benefit obligation, beginning of year	427.2	358.2
Service cost	4.7	3.7
Interest cost	14.5	16.1
Defined Benefit Plan, Curtailments	(3.6)	0
Plan participants' contributions	0.4	0.6
Benefits paid	(10.1)	(8.2)
Actuarial (gain) loss	(49.6)	88.4
Changes in currency translation rates	(23)	(29.3)
Other	(2)	(2.3)
Projected benefit obligations, benefit obligation, end of year	358.5	427.2	358.2
Change in plan assets:
Fair value of plan assets, benefit obligation, beginning of year	414.3	383.1
Actual return on plan assets	16.3	33.7
Plan contributions	12.2	14.6
Benefits paid	(10.1)	(8.2)
Changes in currency translation rates	(23.4)	(28.4)
Other	(24.4)	19.5
Fair value of plan assets, benefit obligation, end of year	384.9	414.3	383.1
Funded status and net amount recognized	26.4	(12.9)
Accumulated benefit obligation, December 31,	357.3	423.7
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Pension assets - included in Other long-term assets	(4.1)	(20.9)
Accumulated other comprehensive loss	(59.6)	(92.4)
Accumulated other comprehensive income yet to be recognized as components of net periodic pension cost, actuarial losses	59	91.6
Allocation of Pension Plan Assets
Defined Benefit Plan, Equity Securities U.K. Equities, Amount	$ 62.7	$ 60.1
Defined benefit plan, equity securities, U.K. equities	16.00%	15.00%
Defined Benefit Plan, Equity Securities Non U.K. Equities, Amount	$ 127.2	$ 125.1
Defined benefit plan, equity securities, non U.K. equities	33.00%	30.00%
Defined Benefit Plan, Debt Securities, Corporate Bonds, Amount	$ 123.4	$ 122.4
Defined benefit plan, debt securities, corporate bonds	32.00%	30.00%
Defined Benefit Plan, Debt Securities, Government and Other Debt Securities, Amount	$ 19	$ 20.1
Defined benefit plan, debt securities, government and other	5.00%	5.00%
Defined Benefit Plan, Debt Securities, Cash and Cash Equivalents, Amount	$ 19.5	$ 30.8
Defined Benefit Plan, Cash and Cash Equivalents	5.00%	7.00%
Defined Benefit Plan, Debt Securities, Other, Amount	$ 33.1	$ 55.8
Defined Benefit Plan, Other	9.00%	13.00%
Defined benefit plan, actual plan asset allocations	100.00%	100.00%
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
Defined benefit plan, estimated future employer contributions in next fiscal year	$ 11.1
2,016	9.2
2,017	9.4
2,018	9.7
2,019	9.9
2,020	10.1
2021 to 2025	54.6
Total	102.9
United States Retirement Plans of US Entity, Defined Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost recognized	19.3	$ 17.1	15.7
Foreign Retirement Plans, Defined Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost recognized	$ 29	$ 27.4	$ 23.4
Minimum [Member] | Pension Plans [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate used in determining present values	2.25%	4.00%	3.50%
Annual increase in future compensation levels	0.00%	0.00%	0.00%
Expected long-term rate of return on assets	2.70%	4.10%	4.70%
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	2.50%	2.25%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	0.00%	0.00%
Maximum [Member] | Pension Plans [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate used in determining present values	3.70%	4.65%	4.70%
Annual increase in future compensation levels	3.50%	3.85%	3.40%
Expected long-term rate of return on assets	5.80%	7.00%	6.64%
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.90%	3.70%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	3.50%	3.50%
Fair Value, Inputs, Level 1 [Member] | Pension Plans [Member]
Change in plan assets:
Fair value of plan assets, benefit obligation, beginning of year	$ 255.1
Fair value of plan assets, benefit obligation, end of year	255.5	$ 255.1
Allocation of Pension Plan Assets
Defined Benefit Plan, Equity Securities U.K. Equities, Amount	46.9	45.2
Defined Benefit Plan, Equity Securities Non U.K. Equities, Amount	104.7	103.5
Defined Benefit Plan, Debt Securities, Corporate Bonds, Amount	91.7	92
Defined Benefit Plan, Debt Securities, Government and Other Debt Securities, Amount	7.4	8
Defined Benefit Plan, Debt Securities, Cash and Cash Equivalents, Amount	3.6	4.9
Defined Benefit Plan, Debt Securities, Other, Amount	1.2	1.5
Fair Value, Inputs, Level 2 [Member] | Pension Plans [Member]
Change in plan assets:
Fair value of plan assets, benefit obligation, beginning of year	110.4
Fair value of plan assets, benefit obligation, end of year	106.9	110.4
Allocation of Pension Plan Assets
Defined Benefit Plan, Equity Securities U.K. Equities, Amount	15.8	14.9
Defined Benefit Plan, Equity Securities Non U.K. Equities, Amount	22.5	21.6
Defined Benefit Plan, Debt Securities, Corporate Bonds, Amount	31.7	30.4
Defined Benefit Plan, Debt Securities, Government and Other Debt Securities, Amount	11.6	12.1
Defined Benefit Plan, Debt Securities, Cash and Cash Equivalents, Amount	15.9	25.9
Defined Benefit Plan, Debt Securities, Other, Amount	9.4	5.5
Fair Value, Inputs, Level 3 [Member] | Pension Plans [Member]
Change in plan assets:
Fair value of plan assets, benefit obligation, beginning of year	48.8
Fair value of plan assets, benefit obligation, end of year	22.5	48.8
Allocation of Pension Plan Assets
Defined Benefit Plan, Equity Securities U.K. Equities, Amount	0	0
Defined Benefit Plan, Equity Securities Non U.K. Equities, Amount	0	0
Defined Benefit Plan, Debt Securities, Corporate Bonds, Amount	0	0
Defined Benefit Plan, Debt Securities, Government and Other Debt Securities, Amount	0	0
Defined Benefit Plan, Debt Securities, Cash and Cash Equivalents, Amount	0	0
Defined Benefit Plan, Debt Securities, Other, Amount	$ 22.5	$ 48.8

Income Taxes, Provision for Inc

Income Taxes, Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
U.S. Federal [Abstract]
Current	$ 30,300	$ 11,100	$ 4,700
Deferred	17,800	30,300	11,900
Total U.S. Federal	48,100	41,400	16,600
State and Local [Abstract]
Current	5,300	6,500	2,600
Deferred	1,900	300	(1,400)
Total State and Local	7,200	6,800	1,200
International [Abstract]
Current	81,900	66,300	58,400
Deferred	(4,400)	(16,900)	15,900
Total International	77,500	49,400	74,300
Total provision for income taxes	132,805	97,588	92,092
Increase or decrease in current tax expense from utilization of prior years' net operating loss carryovers	$ 16,800	$ 23,500	$ (53,300)
U.S. federal income tax rate	35.00%	35.00%	35.00%

Income Taxes, Income Tax Expens

Income Taxes, Income Tax Expense and Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Computed expected tax expense	$ 202,700	$ 170,000	$ 127,900
Increase (reduction) in income taxes from:
State and local income taxes, net of federal income tax benefit	5,900	5,100	1,400
Amortization of goodwill and other intangibles	(5,100)	(5,200)	(5,700)
Nondeductible expenses	5,400	5,100	2,100
International earnings taxed at various rates	(57,000)	(59,100)	(38,900)
Valuation allowances	(4,700)	7,400	5,900
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Amount	(8,300)	(22,400)	0
Other, net	(6,100)	(3,300)	(600)
Total provision for income taxes	$ 132,805	$ 97,588	$ 92,092
Increase (reduction) in income taxes from:
U.S. federal income tax rate	35.00%	35.00%	35.00%
State and local income taxes, net of federal income tax benefit	1.00%	1.00%	0.40%
Amortization of goodwill and other intangibles	(0.90%)	(1.10%)	(1.60%)
Nondeductible expenses	0.90%	1.00%	0.60%
International earnings taxed at various rates	(9.80%)	(12.20%)	(10.60%)
Valuation allowances	(0.80%)	1.50%	1.60%
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Percent	(1.40%)	(4.60%)	0.00%
Other, net	(1.10%)	(0.50%)	(0.20%)
Total	22.90%	20.10%	25.20%

Income Taxes, Foreign Income Ta

Income Taxes, Foreign Income Tax (Details)	12 Months Ended
	Dec. 31, 2015country
Income Tax Foreign Tax Jurisdiction [Line Items]
Number of countries in which the company has operations that constitute an income tax presence	94
Threshold for foreign taxing jurisdiction to be considered very low rate (in hundredths)	25.00%
Foreign tax rate differential	10.00%
HONG KONG [Member]
Income Tax Foreign Tax Jurisdiction [Line Items]
Foreign tax rate considered to be very low tax rates	16.50%
SINGAPORE [Member]
Income Tax Foreign Tax Jurisdiction [Line Items]
Foreign tax rate considered to be very low tax rates	17.00%
UNITED KINGDOM [Member]
Income Tax Foreign Tax Jurisdiction [Line Items]
Foreign tax rate considered to be very low tax rates	20.25%
Peoples Republic of CHINA [Member]
Income Tax Foreign Tax Jurisdiction [Line Items]
Foreign tax rate considered to be very low tax rates	25.00%
NETHERLANDS [Member]
Income Tax Foreign Tax Jurisdiction [Line Items]
Foreign tax rate considered to be very low tax rates	25.00%
CYPRUS [Member]
Income Tax Foreign Tax Jurisdiction [Line Items]
Foreign tax rate considered to be very low tax rates	12.50%
IRELAND [Member]
Income Tax Foreign Tax Jurisdiction [Line Items]
Foreign tax rate considered to be very low tax rates	12.50%
POLAND [Member]
Income Tax Foreign Tax Jurisdiction [Line Items]
Foreign tax rate considered to be very low tax rates	19.00%
SWITZERLAND
Income Tax Foreign Tax Jurisdiction [Line Items]
Foreign tax rate considered to be very low tax rates	21.20%
Other Foreign Tax Authorities [Member]
Income Tax Foreign Tax Jurisdiction [Line Items]
Foreign tax rate considered to be very low tax rates	25.00%

Income Taxes, Income Before Tax

Income Taxes, Income Before Taxes, Domestic and International (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income before taxes from domestic and international sources [Abstract]
Domestic	$ 132,100	$ 111,200	$ 102,800
International	447,000	374,400	262,600
Income before income taxes and noncontrolling interest	$ 579,146	$ 485,608	$ 365,444

Income Taxes, Deferred Tax Asse

Income Taxes, Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets attributable to:
Accrued expenses	$ 170.5	$ 153	$ 128.6
U.S. federal and state loss and credit carryovers	6.6	14.6	56.9
Allowances for uncollectible accounts	7.1	6.8	6.1
International loss carryovers	121	136.9	133.5
Investments in real estate ventures	26.9	33.6	38.8
Pension liabilities	12.6	20	9.2
Deferred tax assets, gross	344.7	364.9	373.1
Less: valuation allowances	(51.7)	(62)	(60.5)
Deferred tax assets, net	293	302.9	312.6
Deferred tax liabilities attributable to:
Property and equipment	0.6	1.6	5.7
Intangible assets	123.9	101.7	91.7
Income deferred for tax purposes	2.2	1.6	2.2
Other	0.4	5.5	6.8
Deferred tax liabilities	127.1	$ 110.4	$ 106.4
Operating Loss Carryforwards [Line Items]
Estimate of US and state tax liability in the event of repatriation of foreign earnings	235
Net deferred tax asset [Abstract]
Net deferred tax asset more likely than not to be realized	165.9
U.S. [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	0
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 6.6
Operating loss carryforwards, expiration dates	Jan. 1, 2030
International [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 500.3

Income Taxes, Valuation Allowan

Income Taxes, Valuation Allowance (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015USD ($)
Deferred Tax Assets Operating Loss Carryforwards Utilized or Expired [Member]
Valuation Allowance [Line Items]
Changes in valuation allowances for deferred tax assets	$ 10.3
Deferred Tax Assets Operating Loss Carryforwards Established or Continued [Member]
Valuation Allowance [Line Items]
Changes in valuation allowances for deferred tax assets	$ 4.6

Income Taxes, Tax Liability and

Income Taxes, Tax Liability and Uncertainties (Details) $ in Millions	Dec. 31, 2015USD ($)citycountrystate	Dec. 31, 2014USD ($)
Income Tax Disclosure [Abstract]
Liability for Uncertain Tax Positions, Noncurrent	$ 13.1
Income tax liability [Abstract]
Net current liability for income tax	2.3	$ (44.8)
Current receivable	90.4	59.3
Current payable	88.1	$ 104.1
Accrued Income Taxes, Noncurrent	$ 13.1
Income tax uncertainties [Abstract]
Number of states where company or one of its subsidiaries files income tax returns | state	47
Number of cities where company or one of its subsidiaries files income tax returns | city	25
Number of other countries the company or one of its subsidiaries files income tax returns | country	80

Income Taxes, Unrecognized Tax

Income Taxes, Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of unrecognized tax benefits [Roll Forward]
Balance as of January 1	$ 48.5	$ 81.1
Additions based on tax positions related to the current year	7.8	6.8
Decrease for the reversals of tax positions of prior years	(11.2)	(4.7)
Reductions for use in settlements with taxing authorities	0	(0.2)
Lapse of statute of limitations	(16.8)	(34.5)
Balance as of December 31	28.3	48.5
Business Combination, Indemnification Assets	12.8	$ 34.5
Conclusion of Examination by Tax Authorities [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Gross unrecognized tax benefits where settlement in next twelve months is reasonably possible	$ 7

Income Taxes, Interest Expense

Income Taxes, Interest Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest expense [Abstract]
Interest included as component of income tax expense	$ 0.1	$ 0.5	$ 0.9
Accrual for payment of interest	$ 1.8	$ 4.7

Fair Value Measurements (Assets

Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets
Investments in real estate ventures - fair value	$ 155,167	$ 113,602
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets
Foreign currency forward contracts receivable	9,500	10,500
Deferred compensation plan assets	134,300	111,200
Investments in real estate ventures - fair value	0	0
Total assets at fair value	143,800	121,700
Liabilities
Foreign currency forward contracts payable	21,200	18,200
Deferred compensation plan liabilities	129,400	107,900
Business Combination, Contingent Consideration, Liability	0	0
Total liabilities at fair value	150,600	126,100
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets
Foreign currency forward contracts receivable	0	0
Deferred compensation plan assets	0	0
Investments in real estate ventures - fair value	155,200	113,600
Total assets at fair value	155,200	113,600
Liabilities
Foreign currency forward contracts payable	0	0
Deferred compensation plan liabilities	0	0
Business Combination, Contingent Consideration, Liability	127,300	25,100
Total liabilities at fair value	$ 127,300	$ 25,100

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value Disclosures [Abstract]
Fair value of long-term debt	$ 282	$ 285.3
Carrying amount of long term debt	275	275
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Notional Amount	2,280	2,030
Foreign currency forward contracts, net notional value	1,260	1,190
Deferred compensation plan, contra-equity, shares held in trust	6.2	6.4
Fair value of investments	155.2	113.6	$ 78.9	$ 63.6
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency forward contract, current asset amount	9.5	10.5
Foreign currency forward contract, current liability amount	21.2	18.2
Deferred compensation plan assets	134.3	111.2
Deferred compensation plan liabilities	129.4	107.9
Foreign Exchange Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	10	12.5
Derivative Asset, Fair Value, Gross Liability	0.5	2
Derivative Liability, Fair Value, Gross Asset	0.9	1.1
Derivative Liability, Fair Value, Gross Liability	$ 22.1	$ 19.3

Debt (Details)

Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount	$ 18,200	$ 22,000
Amount outstanding	254,999	0
Short-term borrowings	49,217	19,623
Unsecured Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	2,000,000	1,200,000
Outstanding borrowings on the revolving credit facility	255,000	0
Average outstanding borrowings	$ 335,100	$ 357,000
Pricing on the Facility based on market rates	LIBOR plus 1.00% to 2.05%
Description of variable rate basis	LIBOR
Basis spread on variable rate	1.00%
Line of credit, interest rate during period	1.10%	1.20%
Covenant terms, minimum leverage ratio through September 2013	350.00%
Covenant Terms Minimum Leverage Ratio Through Specified Date Following a Material Acquisition	400.00%
Covenant terms, minimum cash interest coverage ratio	300.00%
Overdraft Facilities [Member]
Line of Credit Facility [Line Items]
Borrowing capacity remaining	$ 42,100
Bank Overdrafts	24,600	$ 14,600
Long-Term Senior Notes [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Face Amount	$ 275,000	$ 275,000
Debt Instrument, Interest Rate, Stated Percentage	4.40%
Minimum [Member]
Line of Credit Facility [Line Items]
Description of variable rate basis	LIBOR
Basis spread on variable rate	1.00%
Maximum [Member]
Line of Credit Facility [Line Items]
Description of variable rate basis	LIBOR
Basis spread on variable rate	2.05%

Leases (Details)

Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Minimum future lease payments due [Abstract]
2,016	$ 143.5
2,017	121.6
2,018	104.4
2,019	91.2
2,020	75.3
Thereafter	226.6
Minimum lease payments	762.6
Business Acquisition [Line Items]
Accrued liabilities related to excess lease space	4.3
Minimum rentals to be received under noncancelable operating subleases	16.8
Total rent expense including office space and other rentals	141.1	$ 141	$ 131.2
King Sturge [Member]
Business Acquisition [Line Items]
Accrued liabilities related to excess lease space, resulting from business acquisition	$ 2.4

Transactions with Affiliates (D

Transactions with Affiliates (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity Interests in Real Estate Ventures [Member]
Related Party Transaction [Line Items]
Revenues from affiliates	$ 195.1	$ 143.3	$ 125.7
Receivables due from affiliates	32.9	15.1
Employees [Member]
Related Party Transaction [Line Items]
Receivables due from affiliates	140.1	83.6
Employees [Member] | Loans related to co-investments [Member]
Related Party Transaction [Line Items]
Receivables due from affiliates	13.4	8.6
Employees [Member] | Travel, relocation and other miscellaneous advances [Member]
Related Party Transaction [Line Items]
Receivables due from affiliates	$ 126.7	$ 75

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loss Contingencies [Line Items]
Loss Contingency, Receivable	$ 9	$ 1.8
Loss Contingency Accrual, Provision	2.9	7.4	$ 5.7
Loss Contingency Accrual, Provision Adjustment	7.8	(0.8)	(0.2)
Loss Contingency Accrual, Payments	(0.7)	(3.6)	(0.9)
Loss Contingency Accrual	19.2	$ 9.2	$ 6.2	$ 1.6
Level of risk retained by our captive insurance company (per claim)	$ 2.5

Restructuring and Acquisition71

Restructuring and Acquisition Charges (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring and acquisition charges	$ 13,400	$ 18,100	$ 1,800	$ 800	$ 1,100	$ 0	$ 5,400	$ 36,000	$ 34,116	$ 42,505	$ 18,315
Business Combination, Indemnification Assets									12,800	34,500
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability									2,400	(3,900)
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				7,600				10,500	7,600	10,500	31,400
Accruals									18,900	11,900	18,300
Payments made									(17,900)	(14,800)	(39,200)
Restructuring reserve, ending balance	8,600				7,600				8,600	7,600	10,500
Severance [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				3,000				3,800	3,000	3,800	10,000
Accruals									1,700	5,200	12,300
Payments made									(2,000)	(6,000)	(18,500)
Restructuring reserve, ending balance	2,700				3,000				2,700	3,000	3,800
Retention Bonuses [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				0				400	0	400	5,200
Accruals									0	0	100
Payments made									0	(400)	(4,900)
Restructuring reserve, ending balance	0				0				0	0	400
Lease Exit [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				4,200				5,900	4,200	5,900	12,000
Accruals									1,600	3,200	(1,400)
Payments made									(100)	(4,900)	(4,700)
Restructuring reserve, ending balance	5,700				4,200				5,700	4,200	5,900
Other Acquisition Costs [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				$ 400				$ 400	400	400	4,200
Accruals									15,600	3,500	7,300
Payments made									(15,800)	(3,500)	(11,100)
Restructuring reserve, ending balance	$ 200				$ 400				$ 200	$ 400	$ 400

Accumulated Other Comprehensi72

Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 2,718,299	$ 2,409,120	$ 2,190,809	$ 1,959,256
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent	(27,583)	37,086	(19,171)
Foreign currency translation adjustments	(163,657)	(137,951)	(53,319)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(35,800)	(63,400)	(26,300)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	24,300	(38,100)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	3,300	1,000
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent	(27,583)	37,086
Reclassification from AOCI, Current Period, Tax	800	200
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	5,200	(16,700)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(300,500)	(136,800)	1,100
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(163,700)	(137,900)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Foreign currency translation adjustments	(163,657)	(137,951)
Reclassification from AOCI, Current Period, Tax	0	0
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	0	0
Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(336,313)	(200,239)	(25,202)	$ 8,946
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(139,400)	(176,000)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	3,300	1,000
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent	(27,583)	37,086	(19,171)
Foreign currency translation adjustments	(163,657)	(137,951)	$ (53,319)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(136,100)	(175,000)
Reclassification from AOCI, Current Period, Tax	800	200
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	$ 5,200	$ (16,700)

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ in Thousands	2 Months Ended
	Feb. 24, 2016	Feb. 17, 2016	Dec. 31, 2015	Dec. 31, 2014
Subsequent Event [Line Items]
Investments In Real Estate Ventures			$ 311,487	$ 297,142
Subsequent Event [Member]
Subsequent Event [Line Items]
Payments to Acquire Businesses, Gross	$ 92,500
Investments In Real Estate Ventures		$ 40,500

Quarterly Results of Operatio74

Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment									$ 6,043,146	$ 5,477,868	$ 4,492,934
Equity in earnings (losses)	$ 13,700	$ 25,400	$ 27,100	$ 11,300	$ 7,300	$ 19,600	$ 12,500	$ 8,900	77,475	48,265	31,343
Total revenue	1,887,400	1,501,300	1,373,500	1,203,500	1,749,000	1,366,000	1,277,200	1,037,400
Total operating expenses	1,633,600	1,381,000	1,270,500	1,150,800	1,487,200	1,238,500	1,185,500	1,052,700	5,435,873	4,963,939	4,092,772
Restructuring and acquisition charges	13,400	18,100	1,800	800	1,100	0	5,400	36,000	34,116	42,505	18,315
Operating income	253,800	120,300	103,000	52,700	261,800	127,500	91,700	(15,300)	529,798	465,664	368,819
Net Income available to common stockholders	$ 195,900	$ 110,500	$ 90,100	$ 41,900	$ 193,800	$ 104,300	$ 71,700	$ 15,900	$ 438,358	$ 385,749	$ 269,456
Earnings Per Share, Basic	$ 4.35	$ 2.45	$ 2.01	$ 0.93	$ 4.33	$ 2.33	$ 1.61	$ 0.36	$ 9.75	$ 8.63	$ 6.09
Earnings Per Share, Diluted	$ 4.31	$ 2.43	$ 1.98	$ 0.92	$ 4.29	$ 2.30	$ 1.58	$ 0.35	$ 9.65	$ 8.52	$ 5.98
Reportable Subsegments [Member] | EMEA [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment	$ 614,100	$ 447,000	$ 417,400	$ 325,400	$ 556,600	$ 368,600	$ 395,600	$ 311,900	$ 1,803,752	$ 1,632,674	$ 1,322,666
Equity in earnings (losses)									752	17	(535)
Total revenue									1,406,306	1,316,234	1,118,070
Total operating expenses	524,300	420,600	385,200	328,300	471,900	352,200	370,900	316,800	1,658,243	1,511,796	1,233,344
Operating income									145,509	120,878	89,322
Reportable Subsegments [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment	362,500	280,900	279,700	237,700	355,100	272,900	267,500	214,600	1,160,692	1,110,148	965,755
Equity in earnings (losses)									713	447	129
Total revenue									968,912	909,075	847,666
Total operating expenses	308,800	268,000	263,500	233,300	303,000	257,800	251,700	213,400	1,073,491	1,025,940	888,455
Operating income									87,201	84,208	77,300
Reportable Subsegments [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment	815,000	643,900	598,000	554,500	745,900	581,700	545,100	447,300	2,611,444	2,319,911	1,918,641
Equity in earnings (losses)									5,888	775	549
Total revenue									2,399,326	2,109,531	1,806,544
Total operating expenses	706,900	582,300	552,000	519,100	638,300	533,600	498,300	430,300	2,360,381	2,100,545	1,734,650
Operating income									251,063	219,366	183,991
LaSalle [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment	109,500	154,900	105,500	97,200	98,700	162,400	81,500	72,500	467,258	415,135	285,872
Equity in earnings (losses)									70,122	47,026	31,200
Total operating expenses	$ 80,200	$ 92,000	$ 68,000	$ 69,300	$ 72,900	$ 94,900	$ 59,200	$ 56,200	309,642	283,153	218,008
Operating income									157,616	131,982	$ 67,864
Quarterly Results of Operations [Member]
Segment Reporting Information [Line Items]
Equity in earnings (losses)									77,500	48,300
Total revenue									5,965,700	5,429,600
Total operating expenses									5,435,900	4,963,900
Restructuring and acquisition charges									34,100	42,500
Operating income									529,800	465,700
Net Income available to common stockholders									$ 438,400	$ 385,700
Earnings Per Share, Basic									$ 9.75	$ 8.63
Earnings Per Share, Diluted									$ 9.65	$ 8.52
Quarterly Results of Operations [Member] | Reportable Subsegments [Member] | EMEA [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment									$ 1,803,900	$ 1,632,700
Total operating expenses									1,658,400	1,511,800
Quarterly Results of Operations [Member] | Reportable Subsegments [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment									1,160,800	1,110,100
Total operating expenses									1,073,600	1,025,900
Quarterly Results of Operations [Member] | Reportable Subsegments [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment									2,611,400	2,320,000
Total operating expenses									2,360,300	2,100,500
Quarterly Results of Operations [Member] | LaSalle [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment									467,100	415,100
Total operating expenses									$ 309,500	$ 283,200