Arthur J. Gallagher & Co. (AJG) 10-Q 28 Oct 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information	9 Months Ended
	Sep. 30, 2015shares
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Trading Symbol	AJG
Entity Registrant Name	GALLAGHER ARTHUR J & CO
Entity Central Index Key	354,190
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	176,695,000

Consolidated Statement of Earni

Consolidated Statement of Earnings (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Commissions	$ 594.6	$ 572.5	$ 1,748.6	$ 1,523.5
Fees	360.7	337.7	1,051.2	912.3
Supplemental commissions	29.2	24.2	90.9	77.5
Contingent commissions	14.5	14.4	81.8	68.4
Investment income	13.1	18.4	38.5	23.1
Gains on books of business sales	2.6	0.9	7	2.6
Revenues from clean coal activities	408.1	321.2	1,009	750.4
Other net revenues (losses)	32	(2.5)	30.5	23.3
Total revenues	1,454.8	1,286.8	4,057.5	3,381.1
Compensation	604.9	564.6	1,795.2	1,560.9
Operating	208.1	197.3	618.7	525.3
Cost of revenues from clean coal activities	418.9	326.2	1,035	767.7
Interest	25.6	25.9	77.2	63.3
Depreciation	23.8	18.6	68.1	50
Amortization	58.1	54.3	172.3	135.3
Change in estimated acquisition earnout payables	9.7	4.5	25.9	16.6
Total expenses	1,349.1	1,191.4	3,792.4	3,119.1
Earnings before income taxes	105.7	95.4	265.1	262
Benefit for income taxes	(35.2)	(5.9)	(55.8)	(10.8)
Net earnings	140.9	101.3	320.9	272.8
Net earnings attributable to noncontrolling interests	7.6	7.7	26.4	20.9
Net earnings attributable to controlling interests	$ 133.3	$ 93.6	$ 294.5	$ 251.9
Basic net earnings per share	$ 0.76	$ 0.58	$ 1.73	$ 1.68
Diluted net earnings per share	0.75	0.58	1.71	1.67
Dividends declared per common share	$ 0.37	$ 0.36	$ 1.11	$ 1.08

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Earnings (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net earnings	$ 140.9	$ 101.3	$ 320.9	$ 272.8
Change in pension liability, net of taxes	0.6	0.5	1.3	1.4
Foreign currency translation	(152.7)	(136.5)	(237.9)	(82)
Change in fair value of derivative investments, net of taxes	(5.5)	(1.9)	0.9	(0.5)
Comprehensive earnings (loss)	(16.7)	(36.6)	85.2	191.7
Comprehensive earnings attributable to noncontrolling interests	21.6	1.7	16.2	0.4
Comprehensive earnings (loss) attributable to controlling interests	$ (38.3)	$ (38.3)	$ 69	$ 191.3

Consolidated Balance Sheet

Consolidated Balance Sheet - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Cash and cash equivalents	$ 369.7	$ 314.4
Restricted cash	1,349.6	1,367.6
Premiums and fees receivable	1,600.8	1,462.5
Other current assets	700	666.7
Total current assets	4,020.1	3,811.2
Fixed assets - net	200.7	195.4
Deferred income taxes	487.8	392.6
Other noncurrent assets	480.4	385.2
Goodwill - net	3,579.6	3,449.6
Amortizable intangible assets - net	1,741.8	1,776
Total assets	10,510.4	10,010
Premiums payable to insurance and reinsurance companies	2,707.1	2,623.3
Accrued compensation and other accrued liabilities	648.3	623.7
Unearned fees	51.7	66.1
Other current liabilities	54.5	61.7
Premium financing debt	114.6	127.9
Corporate related borrowings - current	153	140
Total current liabilities	3,729.2	3,642.7
Corporate related borrowings - noncurrent	2,125	2,125
Other noncurrent liabilities	948.3	937.2
Total liabilities	6,802.5	6,704.9
Stockholders' equity:
Common stock - issued and outstanding 176.7 shares in 2015 and 164.6 shares in 2014	176.7	164.6
Capital in excess of par value	3,193.6	2,649.4
Retained earnings	778.4	676
Accumulated other comprehensive loss	(496.3)	(260.6)
Stockholders' equity attributable to controlling interests	3,652.4	3,229.4
Stockholders' equity attributable to noncontrolling interests	55.5	75.7
Total stockholders' equity	3,707.9	3,305.1
Total liabilities and stockholders' equity	$ 10,510.4	$ 10,010

Consolidated Balance Sheet (Par

Consolidated Balance Sheet (Parenthetical) - shares shares in Millions	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Common stock - issued shares	176.7	164.6
Common stock - outstanding shares	176.7	164.6

Consolidated Statement of Cash

Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net earnings	$ 294.5	$ 251.9
Adjustments to reconcile net earnings to net cash provided by operating activities:
Net gain on investments and other	(7)	(23.2)
Net loss on noncontrolling interests	26.4	20.9
Depreciation and amortization	240.4	185.3
Change in estimated acquisition earnout payables	25.9	16.6
Amortization of deferred compensation and restricted stock	16.8	17.3
Stock-based and other noncash compensation expense	8.2	7.8
Effect of changes in foreign exchange rates	0.2	(0.7)
Net change in restricted cash	15.3	2.7
Net change in premiums receivable	(86.3)	(50.1)
Net change in premiums payable	218.7	39
Net change in other current assets	(43.7)	(123.5)
Net change in accrued compensation and other accrued liabilities	37.4	116
Net change in fees receivable/unearned fees	(56)	(23.8)
Net change in income taxes payable	(11.7)	5.9
Net change in deferred income taxes	(111.4)	(75.5)
Net change in other noncurrent assets and liabilities	(91.4)	(75.6)
Unrealized foreign currency remeasurement loss	(149.8)	(32.8)
Net cash provided by operating activities	326.5	258.2
Cash flows from investing activities:
Net additions to fixed assets	(71.8)	(59.7)
Cash paid for acquisitions, net of cash acquired	(176.5)	(1,834.6)
Net proceeds from sales of operations/books of business	8.7	3.1
Net funding of investment transactions	(20.6)	(19.5)
Net cash used by investing activities	(260.2)	(1,910.7)
Cash flows from financing activities:
Proceeds from issuance of common stock	199	960.6
Tax impact from issuance of common stock	7.4	6.7
Payments for noncontrolling interests	(30.1)	(25)
Dividends paid	(192.5)	(164.3)
Net borrowings on premium financing debt facility	4.4	36.3
Borrowings on line of credit facility	534	1,017.4
Repayments on line of credit facility	(521)	(1,400.9)
Net borrowings of corporate related long-term debt		1,200
Net cash provided by financing activities	1.2	1,630.8
Effect of changes in foreign exchange rates on cash and cash equivalents	(12.2)	14.1
Net increase (decrease) in cash and cash equivalents	55.3	(7.6)
Cash and cash equivalents at beginning of period	314.4	298.1
Cash and cash equivalents at end of period	369.7	290.5
Supplemental disclosures of cash flow information:
Interest paid	81	59.7
Income taxes paid	$ 55.8	$ 51.6

Consolidated Statement of Stock

Consolidated Statement of Stockholders' Equity (Unaudited) - 9 months ended Sep. 30, 2015 - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Earnings (Loss) [Member]	Noncontrolling Interests [Member]
Beginning Balance at Dec. 31, 2014	$ 3,305.1	$ 164.6	$ 2,649.4	$ 676	$ (260.6)	$ 75.7
Beginning Balance (in shares) at Dec. 31, 2014		164.6
Net earnings	320.9			294.5		26.4
Purchase of subsidiary shares from noncontrolling interests	(15)					(15)
Dividends paid to noncontrolling interests	(21.4)					(21.4)
Change in pension liability, net of taxes of $0.8 million	1.3				1.3
Foreign currency translation	(248.1)				(237.9)	(10.2)
Change in fair value of derivative instruments, net of taxes of $0.6 million	0.9				0.9
Compensation expense related to stock option plan grants	8.2		8.2
Tax impact from issuance of common stock	7.4		7.4
Common stock issued in:
Thirty-eight purchase transactions	341.2	$ 7.1	334.1
Thirty-eight purchase transactions (in shares)		7.1
Stock option plans	$ 38.7	$ 1.4	37.3
Stock option plans (in shares)	1.4	1.4
Employee stock purchase plan	$ 11.1	$ 0.3	10.8
Employee stock purchase plan (in shares)		0.3
Deferred compensation and restricted stock	0.5	$ 0.2	0.3
Deferred compensation and restricted stock (in shares)		0.2
Stock issuance under dribble-out program	149.2	$ 3.1	146.1	0	0
Stock issuance under dribble-out program (in shares)		3.1
Cash dividends declared on common stock	(192.1)			(192.1)
Ending Balance at Sep. 30, 2015	$ 3,707.9	$ 176.7	$ 3,193.6	$ 778.4	$ (496.3)	$ 55.3
Ending Balance (in shares) at Sep. 30, 2015		176.7

Consolidated Statement of Stoc8

Consolidated Statement of Stockholders' Equity (Unaudited) (Parenthetical) $ in Millions	9 Months Ended
	Sep. 30, 2015USD ($)
Statement of Stockholders' Equity [Abstract]
Tax effect on net change in pension liability	$ 0.8
Net change in fair value of derivative instruments, tax	$ 0.6

Nature of Operations and Basis

Nature of Operations and Basis of Presentation	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations and Basis of Presentation	1. Nature of Operations and Basis of Presentation Arthur J. Gallagher & Co. and its subsidiaries, collectively referred to herein as we, our, us or the company, provide insurance brokerage and risk management services to a wide variety of commercial, industrial, institutional and governmental organizations through three reportable operating segments. Commission and fee revenue generated by the brokerage segment is primarily related to the negotiation and placement of insurance for our clients. Fee revenue generated by the risk management segment is primarily related to claims management, information management, risk control consulting (loss control) services and appraisals in the property/casualty market. Investment income and other revenue are generated from our premium financing operations and our investment portfolio, which includes invested cash and restricted funds, as well as clean energy and other investments. We are headquartered in Itasca, Illinois, have operations in 31 countries and offer client-service capabilities in more than 140 countries globally through a network of correspondent insurance brokers and consultants. We have prepared the accompanying unaudited consolidated financial statements pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in annual financial statements have been omitted pursuant to such rules and regulations. The unaudited consolidated financial statements included herein are, in the opinion of management, prepared on a basis consistent with our audited consolidated financial statements for the year ended December 31, 2014 and include all normal recurring adjustments necessary for a fair presentation of the information set forth. The quarterly results of operations are not necessarily indicative of the results of operations to be reported for subsequent quarters or the full year. These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2014. In the preparation of our unaudited consolidated financial statements as of September 30, 2015, management evaluated all material subsequent events or transactions that occurred after the balance sheet date through the date on which the financial statements were issued, for potential recognition or disclosure therein. Reclassification - nine-month Correction of Immaterial Error - nine-month The effect of the immaterial changes to the presentation of our consolidated statement of earnings for the three-month and nine-month Three-month period ended September 30, Nine-month period ended September 30, As Previously As Restated As Previously As Restated Operating expense $ 205.0 $ 197.3 $ 546.2 $ 525.3 Earnings before income taxes $ 87.7 $ 95.4 $ 241.1 $ 262.0 Benefit for income taxes (5.9 ) (5.9 ) (10.8 ) (10.8 ) Net earnings $ 93.6 101.3 $ 251.9 272.8 Net earnings attributable to noncontrolling interests 7.7 20.9 Net earnings attributable to controlling interests $ 93.6 $ 251.9 Basic net earnings per share $ 0.58 $ 0.58 $ 1.68 $ 1.68 Diluted net earnings per share $ 0.58 $ 0.58 $ 1.67 $ 1.67

Effect of New Accounting Pronou

Effect of New Accounting Pronouncements	9 Months Ended
	Sep. 30, 2015
Accounting Changes and Error Corrections [Abstract]
Effect of New Accounting Pronouncements	2. Effect of New Accounting Pronouncements Consolidations In February 2015, the Financial Accounting Standards Board (which we refer to as the FASB) issued new accounting guidance on consolidations, which eliminates the deferral granted to investment companies from applying the variable interest entities guidance and makes targeted amendments to the current consolidation guidance. The new guidance applies to all entities involved with limited partnerships or similar entities and will require re-evaluation of these entities under the revised guidance, which could change previous consolidation conclusions. The guidance is effective in first quarter of 2016. Management is currently reviewing the guidance, and the impact from its adoption on our consolidated financial statements cannot be determined at this time. Debt Issuance Costs In April 2015, the FASB issued new accounting guidance on the presentation of debt issuance costs, which requires debt issuance costs to be presented in the balance sheet as a direct deduction from the associated debt liability. The new guidance will be applied on a retrospective basis and is effective in first quarter of 2016. The adoption of this guidance is not expected to have a material impact on our consolidated financial statements. Business Combinations In September 2015, the FASB issued new accounting guidance on the accounting for measurement-period adjustments, which requires that measurement period adjustments be recognized in the reporting period in which the adjustment amount is determined rather than retrospectively applying the change to the acquisition date. The new guidance will be applied and is effective in first quarter of 2016. The adoption of this guidance is not expected to have a material impact on our consolidated financial statements. Revenue Recognition In May 2014, the FASB issued new accounting guidance on revenue from contracts with customers, which will supersede nearly all existing revenue recognition guidance under U.S. GAAP. The core principal of the new guidance is that an entity should recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. On July 9, 2015, the FASB decided to delay the effective date of the new revenue standard by one year. Reporting entities may choose to adopt the standard as of the original effective date. The FASB decided, based on its outreach to various stakeholders and the forthcoming amendments to the new revenue standard, that a deferral is necessary to provide adequate time to effectively implement the new revenue standard. This new guidance was originally effective for the first quarter of 2017 and early adoption is not permitted. With the one year deferral date, this new guidance is now effective for the first quarter of 2018, but it can be adopted earlier in first quarter of 2017. The guidance permits two methods of transition upon adoption; full retrospective and modified retrospective. Under the full retrospective method, prior periods would be restated under the new revenue standard, providing a comparable view across all periods presented. Under the modified retrospective method, prior periods would not be restated. Rather, revenues and other disclosures for pre-2017/2018 periods would be provided in the notes to the financial statements as previously reported under the current revenue standard. Management is currently reviewing the guidance, and the impact from its adoption on our consolidated financial statements cannot be determined at this time.

Business Combinations

Business Combinations	9 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Business Combinations	3. Business Combinations During the nine-month period ended September 30, 2015, we acquired substantially all of the net assets of the following firms in exchange for our common stock and/or cash. These acquisitions have been accounted for using the acquisition method for recording business combinations (in millions except share data): Name and Effective Date of Acquisition Common Shares Issued Common Share Value Cash Paid Accrued Liability Escrow Deposited Recorded Earnout Payable Total Recorded Purchase Price Maximum Potential Earnout Payable (000s) e3 Financial, Inc. January 1, 2015 2 $ — $ 9.1 $ — $ 0.1 $ 0.7 $ 9.9 $ 7.0 Aequus Trade Credit LLC January 31, 2015 11 0.3 1.5 — 0.2 1.3 3.3 1.9 Cohen & Lord Insurance Brokers Limited February 1, 2015 77 3.6 2.1 — — — 5.7 — Cohn Financial Group, LLC (CFG) February 1, 2015 407 19.0 — — 0.3 4.1 23.4 14.0 Excel Insurance Services, Inc. February 1, 2015 52 1.5 7.3 — 1.0 — 9.8 — Metcom Excess February 1, 2015 49 1.8 2.3 — 0.5 — 4.6 — NationAir Aviation Insurance February 1, 2015 288 12.3 — — 1.3 — 13.6 — Evolution Group of Companies February 6, 2015 101 4.7 0.9 0.5 0.4 2.9 9.4 3.1 Burns-Fazzi, Brock & Associates, LLC (BFB) April 1, 2015 709 33.4 — — 1.0 7.4 41.8 27.0 Madison Risk & Insurance Services, Inc. (MRI) April 1, 2015 232 10.3 3.7 — 1.0 1.4 16.4 4.0 Integrated Healthcare Strategies, LLC (IHS) May 1, 2015 990 41.4 0.5 3.1 6.2 4.5 55.7 20.8 James R. Weir Insurance Agency, Inc. May 1, 2015 56 2.5 — — 0.3 0.8 3.6 1.1 McDowall Associates Human Resources Consultants Ltd. May 1, 2015 34 1.5 0.6 0.6 0.1 0.5 3.3 2.5 Vital Benefits, Inc. May 1, 2015 118 5.6 — — 0.1 — 5.7 — Monument, LLC (ML) June 1, 2015 254 10.8 4.0 — 1.7 2.4 18.9 5.0 Solid Benefit Guidance Limited Liability Company (SBG) June 1, 2015 932 44.0 0.3 2.5 1.0 11.6 59.4 32.5 ARM Re Ltda Corredores de Reaseguros July 1, 2015 — — 0.9 — 0.7 0.2 1.8 0.5 National Administration Company, Inc. (NAC) August 1, 2015 — — 19.1 — 2.1 2.8 24.0 10.8 William Gallagher Associates Insurance Brokers, Inc. (WGA) August 1, 2015 1,605 69.0 75.0 — 7.5 — 151.5 — North Alabama Insurance, Inc. September 1, 2015 188 7.2 — — 0.8 — 8.0 — Nine other acquisitions completed in 2015 128 6.0 13.1 0.4 1.1 3.6 24.2 32.2 6,233 $ 274.9 $ 140.4 $ 7.1 $ 27.4 $ 44.2 $ 494.0 $ 162.4 On June 15, 2015, we signed a definitive agreement to acquire substantially all the assets of William Gallagher Associates Insurance Brokers, Inc. (which we refer to as WGA) headquartered in Boston, Massachusetts for approximately $151.5 million of consideration in a combination of cash and our common stock. WGA has estimated annualized revenues of approximately $50.0 million. The transaction was subject to customary closing conditions and closed on July 31, 2015. WGA has approximately 200 employees and operations in Boston; Atlanta; New York City; Columbia, Maryland; Hartford, Connecticut and Princeton, New Jersey. Common shares issued in connection with acquisitions are valued at closing market prices as of the effective date of the applicable acquisition. We record escrow deposits that are returned to us as a result of adjustments to net assets acquired as reductions of goodwill when the escrows are settled. The maximum potential earnout payables disclosed in the foregoing table represent the maximum amount of additional consideration that could be paid pursuant to the terms of the purchase agreement for the applicable acquisition. The amounts recorded as earnout payables, which are primarily based upon the estimated future operating results of the acquired entities over a two- to three-year period subsequent to the acquisition date, are measured at fair value as of the acquisition date and are included on that basis in the recorded purchase price consideration in the foregoing table. We will record subsequent changes in these estimated earnout obligations, including the accretion of discount, in our consolidated statement of earnings when incurred. The fair value of these earnout obligations is based on the present value of the expected future payments to be made to the sellers of the acquired entities in accordance with the provisions outlined in the respective purchase agreements, which is a Level 3 fair value measurement. In determining fair value, we estimated the acquired entity’s future performance using financial projections developed by management for the acquired entity and market participant assumptions that were derived for revenue growth and/or profitability. Revenue growth rates generally ranged from 4.0% to 12.0% for our 2015 acquisitions. We estimated future payments using the earnout formula and performance targets specified in each purchase agreement and these financial projections. We then discounted these payments to present value using a risk-adjusted rate that takes into consideration market-based rates of return that reflect the ability of the acquired entity to achieve the targets. These discount rates generally ranged from 8.0% to 8.5% for all of our 2015 acquisitions. Changes in financial projections, market participant assumptions for revenue growth and/or profitability, or the risk-adjusted discount rate, would result in a change in the fair value of recorded earnout obligations. During the three-month periods ended September 30, 2015 and 2014, we recognized $3.7 million and $3.9 million, respectively, of expense in our consolidated statement of earnings related to the accretion of the discount recorded for earnout obligations in connection with our acquisitions. During the nine-month periods ended September 30, 2015 and 2014, we recognized $12.2 million and $10.6 million, respectively, of expense in our consolidated statement of earnings related to the accretion of the discount recorded for earnout obligations in connection with our acquisitions. In addition, during the three-month periods ended September 30, 2015 and 2014, we recognized $6.0 million and $0.6 million of expense, respectively, related to net adjustments in the estimated fair value of earnout obligations in connection with revised projections of future performance for 35 and 17 acquisitions, respectively. During the nine-month The following is a summary of the estimated fair values of the net assets acquired at the date of each acquisition made in the nine-month period ended September 30, 2015 (in millions): CFG BFB MRI IHS ML SBG NAC WGA Twenty-One Total Cash $ 0.1 $ 0.1 $ 0.1 $ — $ — $ — $ 0.3 $ — $ 3.2 $ 3.8 Other current assets — 0.3 0.6 8.3 0.2 1.4 — 63.4 29.2 103.4 Fixed assets — — — 1.1 — — 0.2 0.6 5.5 7.4 Noncurrent assets — — — — — — — 0.1 0.6 0.7 Goodwill 13.6 18.5 6.3 24.8 5.7 30.9 6.9 86.8 52.3 245.8 Expiration lists 9.6 23.0 9.9 24.8 13.0 27.7 16.5 62.7 46.1 233.3 Non-compete agreements 0.1 0.1 0.1 0.1 — 0.1 0.1 0.3 1.1 2.0 Total assets acquired 23.4 42.0 17.0 59.1 18.9 60.1 24.0 213.9 138.0 596.4 Current liabilities — 0.2 0.6 3.4 — 0.7 — 62.4 24.2 91.5 Noncurrent liabilities — — — — — — — — 10.9 10.9 Total liabilities assumed — 0.2 0.6 3.4 — 0.7 — 62.4 35.1 102.4 Total net assets acquired $ 23.4 $ 41.8 $ 16.4 $ 55.7 $ 18.9 $ 59.4 $ 24.0 $ 151.5 $ 102.9 $ 494.0 Among other benefits, these acquisitions allow us to expand into desirable geographic locations, further extend our presence in the retail and wholesale insurance brokerage services and risk management industries and increase the volume of general services currently provided. The excess of the purchase price over the estimated fair value of the tangible net assets acquired at the acquisition date was allocated to goodwill, expiration lists and non-compete agreements in the amounts of $245.8 million, $233.3 million and $2.0 million, respectively, within the brokerage and risk management segments. Provisional estimates of fair value are established at the time of each acquisition and are subsequently reviewed within the first year of operations subsequent to the acquisition date to determine the necessity for adjustments. The fair value of the tangible assets and liabilities for each applicable acquisition at the acquisition date approximated their carrying values. The fair value of expiration lists was established using the excess earnings method, which is an income approach based on estimated financial projections developed by management for each acquired entity using market participant assumptions. Revenue growth and attrition rates generally ranged from 2.0% to 3.0% and 5.0% to 13.0%, respectively, for our 2014 and 2015 acquisitions for which valuations were performed in 2015. We estimate the fair value as the present value of the benefits anticipated from ownership of the subject customer list in excess of returns required on the investment in contributory assets necessary to realize those benefits. The rate used to discount the net benefits was based on a risk-adjusted rate that takes into consideration market-based rates of return and reflects the risk of the asset relative to the acquired business. These discount rates generally ranged from 11.0% to 13.0% for our 2014 and 2015 acquisitions for which valuations were performed in 2015. The fair value of non-compete agreements was established using the profit differential method, which is an income approach based on estimated financial projections developed by management for the acquired company using market participant assumptions and various non-compete scenarios. Expiration lists, non-compete agreements and trade names related to our acquisitions are amortized using the straight-line method over their estimated useful lives (three to fifteen years for expiration lists, three to five years for non-compete agreements and five to fifteen years for trade names), while goodwill is not subject to amortization. We use the straight-line method to amortize these intangible assets because the pattern of their economic benefits cannot be reasonably determined with any certainty. We review all of our intangible assets for impairment periodically (at least annually) and whenever events or changes in business circumstances indicate that the carrying value of the assets may not be recoverable. In reviewing intangible assets, if the fair value were less than the carrying amount of the respective (or underlying) asset, an indicator of impairment would exist and further analysis would be required to determine whether or not a loss would need to be charged against current period earnings as a component of amortization expense. Based on the results of impairment reviews during the nine-month period ended September 30, 2015, we wrote off $0.5 million of amortizable intangible assets related to the brokerage segment. Based on the results of impairment reviews during the three-month and nine-month periods ended September 30, 2014, we wrote off $0.6 million and $1.2 million, respectively, of amortizable intangible assets related to the brokerage segment. Of the $233.3 million of expiration lists and $2.0 million of non-compete agreements related to our acquisitions made during the nine-month period ended September 30, 2015, $23.2 million and $0.6 million, respectively, is not expected to be deductible for income tax purposes. Accordingly, we recorded a deferred tax liability of $7.2 million, and a corresponding amount of goodwill, in the nine-month period ended September 30, 2015 related to nondeductible amortizable intangible assets. Our consolidated financial statements for the nine-month period ended September 30, 2015 include the operations of the acquired entities from their respective acquisition dates. The following is a summary of the unaudited pro forma historical results, as if these entities had been acquired at January 1, 2014 (in millions, except per share data): Three-month period ended September 30, Nine-month period ended September 30, 2015 2014 2015 2014 Total revenues $ 1,461.7 $ 1,332.5 $ 4,133.3 $ 3,518.2 Net earnings attributable to controlling interests 134.2 96.0 301.7 260.6 Basic net earnings per share 0.76 0.58 1.73 1.67 Diluted net earnings per share 0.76 0.57 1.72 1.66 The unaudited pro forma results above have been prepared for comparative purposes only and do not purport to be indicative of the results of operations which actually would have resulted had these acquisitions occurred at January 1, 2014, nor are they necessarily indicative of future operating results. Annualized revenues of entities acquired during the nine-month period ended September 30, 2015 totaled approximately $184.5 million. For the nine-month

Other Current Assets

Other Current Assets	9 Months Ended
	Sep. 30, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Current Assets	4. Other Current Assets Major classes of other current assets consist of the following (in millions): September 30, December 31, 2015 2014 Premium finance advances and loans $ 217.0 $ 232.6 Accrued supplemental, direct bill and other receivables 167.6 156.3 Refined coal production related receivables 135.0 103.5 Deferred income taxes - current 109.4 102.2 Prepaid expenses 71.0 72.1 Total other current assets $ 700.0 $ 666.7 The premium finance loans represent short-term loans which we make to many of our brokerage related clients and other non-brokerage

Intangible Assets

Intangible Assets	9 Months Ended
	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	5. Intangible Assets The carrying amount of goodwill at September 30, 2015 and December 31, 2014 allocated by domestic and foreign operations is as follows (in millions): Risk Brokerage Management Corporate Total At September 30, 2015 United States $ 1,885.2 $ 23.5 $ — $ 1,908.7 United Kingdom 803.3 3.6 — 806.9 Canada 293.3 — — 293.3 Australia 342.9 — — 342.9 Other foreign, principally New Zealand 227.5 0.3 — 227.8 Total goodwill - net $ 3,552.2 $ 27.4 $ — $ 3,579.6 At December 31, 2014 United States $ 1,652.6 $ 20.2 $ — $ 1,672.8 United Kingdom 818.7 1.9 — 820.6 Canada 318.5 — — 318.5 Australia 336.8 — — 336.8 Other foreign, principally New Zealand 300.9 — — 300.9 Total goodwill - net $ 3,427.5 $ 22.1 $ — $ 3,449.6 The changes in the carrying amount of goodwill for the nine-month period ended September 30, 2015 are as follows (in millions): Risk Brokerage Management Corporate Total Balance as of December 31, 2014 $ 3,427.5 $ 22.1 $ — $ 3,449.6 Goodwill acquired during the period 243.8 2.0 — 245.8 Goodwill related to transfer of operations between segments (3.4 ) 3.4 — — Goodwill adjustments due to appraisals and other acquisition adjustments 34.8 — — 34.8 Foreign currency translation adjustments during the period (150.5 ) (0.1 ) — (150.6 ) Balance as of September 30, 2015 $ 3,552.2 $ 27.4 $ — $ 3,579.6 Major classes of amortizable intangible assets at September 30, 2015 and December 31, 2014 consist of the following (in millions): September 30, December 31, 2015 2014 Expiration lists $ 2,590.7 $ 2,461.9 Accumulated amortization - expiration lists (870.4 ) (719.3 ) 1,720.3 1,742.6 Non-compete agreements 42.2 43.2 Accumulated amortization - non-compete agreements (33.4 ) (29.5 ) 8.8 13.7 Trade names 26.1 29.7 Accumulated amortization - trade names (13.4 ) (10.0 ) 12.7 19.7 Net amortizable assets $ 1,741.8 $ 1,776.0 Estimated aggregate amortization expense for each of the next five years is as follows: 2015 (remaining three months) $ 58.4 2016 228.7 2017 218.3 2018 204.3 2019 190.8 Total $ 900.5

Credit and Other Debt Agreement

Credit and Other Debt Agreements	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Credit and Other Debt Agreements	6. Credit and Other Debt Agreements The following is a summary of our corporate and other debt (in millions): September 30, December 31, 2015 2014 Note Purchase Agreements: Semi-annual payments of interest, fixed rate of 6.44%, balloon due 2017 $ 300.0 $ 300.0 Semi-annual payments of interest, fixed rate of 5.85%, $50 million due in 2016, 2018 and 2019 150.0 150.0 Semi-annual payments of interest, fixed rate of 2.80%, balloon due 2018 50.0 50.0 Semi-annual payments of interest, fixed rate of 3.20%, balloon due 2019 50.0 50.0 Semi-annual payments of interest, fixed rate of 3.99%, balloon due 2020 50.0 50.0 Semi-annual payments of interest, fixed rate of 3.48%, balloon due 2020 50.0 50.0 Semi-annual payments of interest, fixed rate of 5.18%, balloon due 2021 75.0 75.0 Semi-annual payments of interest, fixed rate of 3.69%, balloon due 2022 200.0 200.0 Semi-annual payments of interest, fixed rate of 5.49%, balloon due 2023 50.0 50.0 Semi-annual payments of interest, fixed rate of 4.13%, balloon due 2023 200.0 200.0 Semi-annual payments of interest, fixed rate of 4.58%, balloon due 2024 325.0 325.0 Semi-annual payments of interest, fixed rate of 4.31%, balloon due 2025 200.0 200.0 Semi-annual payments of interest, fixed rate of 4.73%, balloon due 2026 175.0 175.0 Semi-annual payments of interest, fixed rate of 4.36%, balloon due 2026 150.0 150.0 Semi-annual payments of interest, fixed rate of 4.98%, balloon due 2029 100.0 100.0 Total Note Purchase Agreements 2,125.0 2,125.0 Credit Agreement: Periodic payments of interest and principal, prime or LIBOR plus up to 1.45%, expires September 19, 2018 153.0 140.0 Premium Financing Debt Facility - expires May 18, 2017: Periodic payments of interest and principal, Interbank rates plus 1.05% for Facility B; plus 0.55% for Facilities C and D Facility B AUD denominated tranche 91.8 95.0 NZD denominated tranche 7.9 17.8 Facility C and D AUD denominated tranche 5.4 7.7 NZD denominated tranche 9.5 7.4 Total Premium Financing Debt Facility 114.6 127.9 Total corporate and other debt $ 2,392.6 $ 2,392.9 Note Purchase Agreements We are a party to a note purchase agreement dated November 30, 2009, with certain accredited institutional investors, pursuant to which we issued and sold $150.0 million in aggregate principal amount of our 5.85% Senior Notes, Series C, due in three equal installments on November 30, 2016, November 30, 2018 and November 30, 2019, in a private placement. These notes require semi-annual payments of interest that are due in May and November of each year. We are a party to a note purchase agreement dated February 10, 2011, with certain accredited institutional investors, pursuant to which we issued and sold $75.0 million in aggregate principal amount of our 5.18% Senior Notes, Series D, due February 10, 2021 and $50.0 million in aggregate principal amount of our 5.49% Senior Notes, Series E, due February 10, 2023, in a private placement. These notes require semi-annual payments of interest that are due in February and August of each year. We are a party to a note purchase agreement dated July 10, 2012, with certain accredited institutional investors, pursuant to which we issued and sold $50.0 million in aggregate principal amount of our 3.99% Senior Notes, Series F, due July 10, 2020, in a private placement. These notes require semi-annual payments of interest that are due in January and July of each year. We are a party to a note purchase agreement dated June 14, 2013, with certain accredited institutional investors, pursuant to which we issued and sold $200.0 million in aggregate principal amount of our 3.69% Senior Notes, Series G, due June 14, 2022, in a private placement. These notes require semi-annual payments of interest that are due in June and December of each year. We are a party to a note purchase agreement dated December 20, 2013, with certain accredited institutional investors, pursuant to which we issued and sold $325.0 million in aggregate principal amount of our 4.58% Senior Notes, Series H, due February 27, 2024, $175.0 million in aggregate principal amount of our 4.73% Senior Notes, Series I, due February 27, 2026 and $100.0 million in aggregate principal amount of our 4.98% Senior Notes, Series J, due February 27, 2029. These notes require semi-annual payments of interest that are due in February and August of each year. The funding of this note purchase agreement occurred on February 27, 2014. We incurred approximately $1.4 million of debt acquisition costs that was capitalized and will be amortized on a pro rata basis over the life of the debt. We are a party to a note purchase agreement dated June 24, 2014, with certain accredited institutional investors, pursuant to which we issued and sold $50.0 million in aggregate principal amount of our 2.80% Senior Notes, Series K, due June 24, 2018, $50.0 million in aggregate principal amount of our 3.20% Senior Notes, Series L, due June 24, 2019, $50.0 million in aggregate principal amount of our 3.48% Senior Notes, Series M, due June 24, 2020, $200.0 million in aggregate principal amount of our 4.13% Senior Notes, Series N, due June 24, 2023, $200.0 million in aggregate principal amount of our 4.31% Senior Notes, Series O, due June 24, 2025 and $150.0 million in aggregate principal amount of our 4.36% Senior Notes, Series P, due June 24, 2026. These notes require semi-annual payments of interest that are due in June and December of each year. We incurred approximately $2.6 million of debt acquisition costs that was capitalized and will be amortized on a pro rata basis over the life of the debt. Under the terms of the note purchase agreements described above, we may redeem the notes at any time, in whole or in part, at 100% of the principal amount of such notes being redeemed, together with accrued and unpaid interest and a “make-whole amount.” The “make-whole amount” is derived from a net present value computation of the remaining scheduled payments of principal and interest using a discount rate based on U.S. Treasury yields plus 0.5% and is designed to compensate the purchasers of the notes for their investment risk in the event prevailing interest rates at the time of prepayment are less favorable than the interest rates under the notes. We do not currently intend to prepay any of the notes. The note purchase agreements described above contain customary provisions for transactions of this type, including representations and warranties regarding us and our subsidiaries and various financial covenants, including covenants that require us to maintain specified financial ratios. We were in compliance with these covenants as of September 30, 2015. The note purchase agreements also provide customary events of default, generally with corresponding grace periods, including, without limitation, payment defaults with respect to the notes, covenant defaults, cross-defaults to other agreements evidencing our or our subsidiaries’ indebtedness, certain judgments against us or our subsidiaries and events of bankruptcy involving us or our material subsidiaries. The notes issued under the note purchase agreements are senior unsecured obligations of ours and rank equal in right of payment with our Credit Agreement discussed below. Credit Agreement The Credit Agreement provides that we may elect that each borrowing in U.S. dollars be either base rate loans or Eurocurrency loans, as defined in the Credit Agreement. All loans denominated in currencies other than U.S. dollars will be Eurocurrency loans. Interest rates on base rate loans and outstanding drawings on letters of credit in U.S. dollars under the Credit Agreement are based on the base rate, as defined in the Credit Agreement. Interest rates on Eurocurrency loans or outstanding drawings on letters of credit in currencies other than U.S. dollars are based on an adjusted London Interbank Offered Rate (which we refer to as LIBOR), as defined in the Credit Agreement, plus a margin of 0.85%, 0.95%, 1.05%, 1.25% or 1.45%, depending on the financial leverage ratio we maintain. Interest rates on swing loans are based, at our election, on either the base rate, as defined in the Credit Agreement, or such alternate rate as may be quoted by the lead lender. The annual facility fee related to the Credit Agreement is 0.15%, 0.175%, 0.20%, 0.25% or 0.30% of the used and unused portions of the revolving credit commitment, depending on the financial leverage ratio we maintain. In connection with entering into the Credit Agreement, we incurred approximately $2.1 million of debt acquisition costs that were capitalized and will be amortized on a pro rata basis over the term of the Credit Agreement. The terms of the Credit Agreement include various financial covenants, including covenants that require us to maintain specified financial ratios. We were in compliance with these covenants as of September 30, 2015. The Credit Agreement also includes customary provisions for transactions of this type, including events of default, with corresponding grace periods and cross-defaults to other agreements evidencing our indebtedness. At September 30, 2015, $23.1 million of letters of credit (for which we had $11.2 million of liabilities recorded at September 30, 2015) were outstanding under the Credit Agreement. There were $153.0 million of borrowings outstanding under the Credit Agreement at September 30, 2015. Accordingly, as of September 30, 2015, $423.9 million remained available for potential borrowings under the Credit Agreement, of which $51.9 million was available for additional letters of credit. Premium Financing Debt Facility The interest rates on Facility B are Interbank rates, which vary by tranche, duration and currency, plus a margin of 1.05%. The interest rates on Facilities C and D are 30 day Interbank rates, plus a margin of 0.55%. The annual fee for Facility B is 0.4725% of the undrawn commitments for the two tranches of the facility. The annual fee for Facilities C and D is 0.50% of the total commitments of the facilities. The terms of our Premium Financing Debt Facility include various financial covenants, including covenants that require us to maintain specified financial ratios. We were in compliance with these covenants as of September 30, 2015. The Premium Financing Debt Facility also includes customary provisions for transactions of this type, including events of default, with corresponding grace periods and cross-defaults to other agreements evidencing our indebtedness. Facilities B, C and D are secured by the premium finance receivables of the Australian and New Zealand premium finance subsidiaries. At September 30, 2015, AU$130.0 million and NZ$12.5 million of borrowings were outstanding under Facility B, AU$7.7 million of borrowings were outstanding under Facility C and NZ$15.0 million of borrowings were outstanding under Facility D. Accordingly, as of September 30, 2015, AU$20.0 million and NZ$22.5 million remained available for potential borrowing under Facility B, and AU$17.3 million and NZ$0.0 million under Facilities C and D, respectively. See Note 13 to these unaudited consolidated financial statements for additional discussion on our contractual obligations and commitments as of September 30, 2015. The aggregate estimated fair value of the $2,125.0 million in debt under the note purchase agreements at September 30, 2015 was $2,261.2 million due to the long-term duration and fixed interest rates associated with these debt obligations. No active or observable market exists for our private placement long-term debt. Therefore, the estimated fair value of this debt is based on discounted future cash flows, which is a Level 3 fair value measurement, using current interest rates available for debt with similar terms and remaining maturities. See Note 1, Fair Value of Financial Instruments, to our consolidated financial statements included in Item 8 of our Annual Report on Form 10-K

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Earnings Per Share	7. Earnings Per Share The following table sets forth the computation of basic and diluted net earnings per share (in millions, except per share data): Three-month period ended September 30, Nine-month period ended 2015 2014 2015 2014 Net earnings attributable to controlling interests $ 133.3 $ 93.6 $ 294.5 $ 251.9 Weighted average number of common shares outstanding 176.0 160.2 170.7 149.6 Dilutive effect of stock options using the treasury stock method 0.8 1.3 1.1 1.4 Weighted average number of common and common equivalent shares outstanding 176.8 161.5 171.8 151.0 Basic net earnings per share $ 0.76 $ 0.58 $ 1.73 $ 1.68 Diluted net earnings per share $ 0.75 $ 0.58 $ 1.71 $ 1.67 Options to purchase 3.9 million and 1.9 million shares of common stock were outstanding at September 30, 2015 and 2014, respectively, but were not included in the computation of the dilutive effect of stock options for the three-month nine-month

Stock Option Plans

Stock Option Plans	9 Months Ended
	Sep. 30, 2015
Text Block [Abstract]
Stock Option Plans	8. Stock Option Plans On May 13, 2014, our stockholders approved the Arthur J. Gallagher 2014 Long-Term Incentive Plan (which we refer to as the LTIP), which replaced our previous stockholder-approved Arthur J. Gallagher & Co. 2011 Long-Term Incentive Plan (which we refer to as the 2011 LTIP). The LTIP term began May 13, 2014 and terminates on the date of the annual meeting of stockholders in 2021, unless terminated earlier by our board of directors. All of our officers, employees and non-employee directors are eligible to receive awards under the LTIP. The compensation committee of our board of directors determines the participants under the LTIP. The LTIP provides for non-qualified and incentive stock options, stock appreciation rights, restricted stock, restricted stock units and performance units, any or all of which may be made contingent upon the achievement of performance criteria. A stock appreciation right entitles the holder to receive, upon exercise and subject to withholding taxes, cash or shares of our common stock (which may be restricted stock) with a value equal to the difference between the fair market value of our common stock on the exercise date and the base price of the stock appreciation right. Subject to the LTIP limits, the compensation committee has the discretionary authority to determine the size of an award. Shares of our common stock available for issuance under the LTIP include authorized and unissued shares of common stock or authorized and issued shares of common stock reacquired and held as treasury shares or otherwise, or a combination thereof. The number of available shares will be reduced by the aggregate number of shares that become subject to outstanding awards granted under the LTIP. To the extent that shares subject to an outstanding award granted under either the LTIP or the 2011 LTIP are not issued or delivered by reason of the expiration, termination, cancellation or forfeiture of such award or by reason of the settlement of such award in cash, then such shares will again be available for grant under the LTIP. Shares withheld to satisfy tax withholding requirements upon the vesting of awards other than stock options and stock appreciation rights will also be available for grant under the LTIP. Shares that are subject to a stock appreciation right and were not issued upon the net settlement or net exercise of such stock appreciation right, shares that are used to pay the exercise price of an option, delivered to or withheld by us to pay withholding taxes related to stock options or stock appreciation rights, and shares that are purchased on the open market with the proceeds of an option exercise, may not again be made available for issuance. The maximum number of shares available under the LTIP for restricted stock, restricted stock unit awards and performance unit awards settled with stock (i.e., all awards other than stock options and stock appreciation rights) is 1.5 million at September 30, 2015. To the extent necessary to be qualified performance-based compensation under Section 162(m) of the Internal Revenue Code (which we refer to as the IRC): (i) the maximum number of shares with respect to which options or stock appreciation rights or a combination thereof that may be granted during any fiscal year to any person is 200,000; (ii) the maximum number of shares with respect to which performance-based restricted stock or restricted stock units that may be granted during any fiscal year to any person is 100,000; (iii) the maximum amount that may be payable with respect to cash-settled performance units granted during any fiscal year to any person is $5.0 million; and (iv) the maximum number of shares with respect to which stock-settled performance units may be granted during any fiscal year to any person is 100,000. The LTIP provides for the grant of stock options, which may be either tax-qualified incentive stock options or non-qualified options and stock appreciation rights. The compensation committee determines the period for the exercise of a non-qualified stock option, tax-qualified incentive stock option or stock appreciation right, provided that no option can be exercised later than seven years after its date of grant. The exercise price of a non-qualified stock option or tax-qualified incentive stock option and the base price of a stock appreciation right cannot be less than 100% of the fair market value of a share of our common stock on the date of grant, provided that the base price of a stock appreciation right granted in tandem with an option will be the exercise price of the related option. Upon exercise, the option exercise price may be paid in cash, by the delivery of previously owned shares of our common stock, through a net-exercise arrangement, or through a broker-assisted cashless exercise arrangement. The compensation committee determines all of the terms relating to the exercise, cancellation or other disposition of an option or stock appreciation right upon a termination of employment, whether by reason of disability, retirement, death or any other reason. Stock option and stock appreciation right awards under the LTIP are non-transferable. On March 11, 2015, the compensation committee granted 1,941,000 options under the 2014 LTIP to our officers and key employees that become exercisable at the rate of 34%, 33% and 33% on the anniversary date of the grant in 2018, 2019 and 2020, respectively. On March 12, 2014, the compensation committee granted 1,923,000 options to our officers and key employees that become exercisable at the rate of 34%, 33% and 33% on the anniversary date of the grant in 2017, 2018 and 2019, respectively. The 2015 and 2014 options expire seven years from the date of grant, or earlier in the event of certain terminations of employment. For certain of our executive officers age 55 or older, stock options awarded in 2015 and 2014 are no longer subject to forfeiture upon such officers’ departure from the company after two years from the date of grant. Our stock option plans provide for the immediate vesting of all outstanding stock option grants in the event of a change in control of our company, as defined in the applicable plan documents. During the three-month periods ended September 30, 2015 and 2014, we recognized $3.1 million and $2.7 million, respectively, of compensation expense related to our stock option grants. During the nine-month periods ended September 30, 2015 and 2014, we recognized $8.2 million and $6.7 million, respectively, of compensation expense related to our stock option grants. For purposes of expense recognition, the estimated fair values of the stock option grants are amortized to expense over the options’ vesting period. We estimated the fair value of stock options at the date of grant using the Black-Scholes option pricing model with the following weighted average assumptions: 2015 2014 Expected dividend yield 3.0 % 3.0 % Expected risk-free interest rate 1.8 % 1.8 % Volatility 28.2 % 28.9 % Expected life (in years) 5.5 5.5 Option valuation models require the input of highly subjective assumptions including the expected stock price volatility. The Black-Scholes option pricing model was developed for use in estimating the fair value of traded options which have no vesting restrictions and are fully transferable. Because our employee and director stock options have characteristics significantly different from those of traded options, and because changes in the selective input assumptions can materially affect the fair value estimate, in management’s opinion, the existing models do not necessarily provide a reliable single measure of the fair value of our employee and non-employee director stock options. The weighted average fair value per option for all options granted during the nine-month periods ended September 30, 2015 and 2014, as determined on the grant date using the Black-Scholes option pricing model, was $9.25 and $9.66, respectively. The following is a summary of our stock option activity and related information for 2015 (in millions, except exercise price and year data): Nine-month period ended September 30, 2015 Shares Under Option Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value Beginning balance 8.4 $ 35.49 Granted 1.9 46.19 Exercised (1.4 ) 27.57 Forfeited or canceled — — Ending balance 8.9 $ 39.16 4.39 $ 39.3 Exercisable at end of period 2.2 $ 28.52 2.17 $ 27.5 Ending vested and expected to vest 8.7 $ 39.05 4.36 $ 39.2 Options with respect to 7.1 million shares (less any shares of restricted stock issued under the LTIP - see Note 10 to these unaudited consolidated financial statements) were available for grant under the LTIP at September 30, 2015. The total intrinsic value of options exercised during the nine-month periods ended September 30, 2015 and 2014 was $26.3 million and $26.6 million, respectively. As of September 30, 2015, we had approximately $38.0 million of total unrecognized compensation expense related to nonvested options. We expect to recognize that cost over a weighted average period of approximately four years. Other information regarding stock options outstanding and exercisable at September 30, 2015 is summarized as follows (in millions, except exercise price and year data): Options Outstanding Options Exercisable Range of Exercise Prices Number Outstanding Weighted Average Remaining Contractual Term (in years) Weighted Average Exercise Price Number Exercisable Weighted Average Exercise Price $ 21.28 - $ 35.71 3.3 2.53 $ 30.51 2.2 $ 28.51 35.95 - 46.17 3.6 5.52 42.93 — — 46.87 - 46.87 1.9 5.45 46.87 — — 47.92 - 47.92 0.1 6.58 47.92 — — $ 21.28 - $ 47.92 8.9 4.39 $ 39.16 2.2 $ 28.52

Deferred Compensation

Deferred Compensation	9 Months Ended
	Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]
Deferred Compensation	9. Deferred Compensation We have a Deferred Equity Participation Plan (which we refer to as the Age 62 Plan), which is a non-qualified plan that generally provides for distributions to certain of our key executives when they reach age 62 (or the one-year anniversary of the date of the grant for participants over the age of 61 as of the grant date) or upon or after their actual retirement. Under the provisions of the Age 62 Plan, we typically contribute cash in an amount approved by the compensation committee to a rabbi trust on behalf of the executives participating in the Age 62 Plan, and instruct the trustee to acquire a specified number of shares of our common stock on the open market or in privately negotiated transactions based on participant elections. Distributions under the Age 62 Plan may not normally be made until the participant reaches age 62 (or the one-year anniversary of the date of the grant for participants over the age of 61 as of the grant date) and are subject to forfeiture in the event of voluntary termination of employment prior to then. All contributions to the plan deemed to be invested in shares of our common stock are distributed in the form of our common stock and all other distributions are paid in cash. Our common stock that is issued to or purchased by the rabbi trust as a contribution under the Age 62 Plan is valued at historical cost, which equals its fair market value at the date of grant or date of purchase. When common stock is issued, we record an unearned deferred compensation obligation as a reduction of capital in excess of par value in the accompanying consolidated balance sheet, which is amortized to compensation expense ratably over the vesting period of the participants. Future changes in the fair market value of our common stock owed to the participants do not have any impact on the amounts recorded in our consolidated financial statements. In the first quarter of each of 2015 and 2014, the compensation committee approved $8.9 million and $9.2 million, respectively, of awards in the aggregate to certain key executives under the Age 62 Plan that were contributed to the rabbi trust in first quarter 2015 and 2014, respectively. We contributed cash to the rabbi trust and instructed the trustee to acquire a specified number of shares of our common stock on the open market to fund these 2015 and 2014 awards. During the three-month periods ended September 30, 2015 and 2014, we charged $2.1 million and $2.4 million, respectively, to compensation expense related to these awards. During the nine-month periods ended September 30, 2015 and 2014, we charged $5.2 million and $5.6 million, respectively, to compensation expense related to these awards. At September 30, 2015 and December 31, 2014, we recorded $35.7 million (related to 2.1 million shares) and $28.2 million (related to 1.9 million shares), respectively, of unearned deferred compensation as a reduction of capital in excess of par value in the accompanying consolidated balance sheet. The total intrinsic value of our unvested equity based awards under the plan at September 30, 2015 and December 31, 2014 was $86.9 million and $89.1 million, respectively. During the nine-month period ended September 30, 2015, cash and equity awards with an aggregate fair value of $0.8 million were vested and distributed to executives under the Age 62 Plan. We have a Deferred Cash Participation Plan (which we refer to as the DCPP), which is a non-qualified deferred compensation plan for certain key employees, other than executive officers, that generally provides for vesting and/or distributions no sooner than five years from the date of awards. Under the provisions of the DCPP, we typically contribute cash in an amount approved by compensation committee to the rabbi trust on behalf of the executives participating in the DCPP, and instruct the trustee to acquire a specified number of shares of our common stock on the open market or in privately negotiated transactions based on participant elections. In the first quarter of each of 2015 and 2014, the compensation committee approved $2.7 million and $2.9 million, respectively, of awards in the aggregate to certain key executives under the DCPP that were contributed to the rabbi trust in first quarter 2015 and 2014, respectively. During the three-month

Restricted Stock, Performance S

Restricted Stock, Performance Share and Cash Awards	9 Months Ended
	Sep. 30, 2015
Text Block [Abstract]
Restricted Stock, Performance Share and Cash Awards	10. Restricted Stock, Performance Share and Cash Awards Restricted Stock Awards As discussed in Note 8 to these unaudited consolidated financial statements, on May 13, 2014, our stockholders approved the LTIP, which replaced our previous stockholder-approved 2011 LTIP. The LTIP provides for the grant of a stock award either as restricted stock or as restricted stock units. In either case, the compensation committee may determine that the award will be subject to the attainment of performance measures over an established performance period. Stock awards and the related dividend equivalents are non-transferable and subject to forfeiture if the holder does not remain continuously employed with us during the applicable restriction period or, in the case of a performance-based award, if applicable performance measures are not attained. The compensation committee will determine all of the terms relating to the satisfaction of performance measures and the termination of a restriction period, or the forfeiture and cancellation of a restricted stock award upon a termination of employment, whether by reason of disability, retirement, death or any other reason. The compensation committee may grant unrestricted shares of common stock or units representing the right to receive shares of common stock to employees who have attained age 62. The agreements awarding restricted stock units under the LTIP will specify whether such awards may be settled in shares of our common stock, cash or a combination of shares and cash and whether the holder will be entitled to receive dividend equivalents, on a current or deferred basis, with respect to such award. Prior to the settlement of a restricted stock unit, the holder of a restricted stock unit will have no rights as a stockholder of the company. The maximum number of shares available under the LTIP for restricted stock, restricted stock units and performance unit awards settled with stock (i.e., all awards other than stock options and stock appreciation rights) is 2.0 million. At September 30, 2015, 1.5 million shares were available for grant under the LTIP for such awards. In the first quarter of each of 2015 and 2014, we granted 362,600 and 323,600 restricted stock units, respectively, to employees under the LTIP, with an aggregate fair value of $16.7 million and $15.2 million, respectively, at the date of grant. These 2015 and 2014 awards of restricted stock units vest as follows: 362,600 units granted in first quarter 2015 and 323,600 units granted in first quarter 2014, vest in full based on continued employment through March 11, 2019 and March 12, 2018, respectively. In the third quarter of 2014, we granted 33,741 restricted stock units to employees with an aggregate fair value of $1.5 million at the date of grant. These grants vest at the rate of 34%, 33% and 33% on the anniversary date of the grant in 2015, 2016 and 2017. For certain of our executive officers age 55 or older, restricted stock units awarded in 2015 and 2014 are no longer subject to forfeiture upon such officers’ departure from the company after two years from the date of grant. We account for restricted stock awards at historical cost, which equals its fair market value at the date of grant, which is amortized to compensation expense ratably over the vesting period of the participants. Future changes in the fair value of our common stock that is owed to the participants do not have any impact on the amounts recorded in our consolidated financial statements. During the three-month periods ended September 30, 2015 and 2014, we recognized $3.2 million and $3.1 million, respectively, to compensation expense related to restricted stock unit awards granted in 2006 through 2015. During the nine-month periods ended September 30, 2015 and 2014, we recognized $10.7 million and $9.6 million, respectively, to compensation expense related to restricted stock unit awards granted in 2006 through 2015. The total intrinsic value of unvested restricted stock units at September 30, 2015 and 2014 was $57.3 million and $55.0 million, respectively. During the nine-month periods ended September 30, 2015 and 2014, equity awards (including accrued dividends) with an aggregate fair value of $10.2 million and $9.7 million were vested and distributed to employees under this plan. Performance Share Awards On March 11, 2015 and March 12, 2014, pursuant to the LTIP, the compensation committee approved 53,900 and 48,800, respectively of provisional performance unit awards, with an aggregate fair value of $2.5 million and $2.3 million, respectively, for future grants to our officers. Each performance unit award was equivalent to the value of one share of our common stock on the date such provisional award was approved. These awards are subject to a one-year performance period based on our financial performance and a two-year vesting period. At the discretion of the compensation committee and determined based on our performance, the eligible officer will be granted a percentage of the provisional performance unit award that equates to the EBITAC growth achieved (as specified in the applicable grant agreement). At the end of the performance period, eligible participants will be granted a number of units based on achievement of the performance goal and subject to approval by the compensation committee. Granted units for the 2015 and 2014 provisional awards will fully vest based on continuous employment through January 1, 2018 and January 1, 2017, respectively, and will be settled in shares of our common stock on a one-for-one basis as soon as practicable in 2018 and 2017, respectively. For certain of our executive officers age 55 or older, awards granted in 2015 and 2014 are no longer subject to forfeiture upon such officers’ departure from the company after two years from the date of grant. If an eligible employee leaves us prior to the vesting date, the entire award will be forfeited. Cash Awards On March 11, 2015, pursuant to our Performance Unit Program (which we refer to as the Program), the compensation committee approved provisional cash awards of $14.6 million in the aggregate for future grants to our officers and key employees that are denominated in units (315,000 units in the aggregate), each of which was equivalent to the value of one share of our common stock on the date the provisional award was approved. The Program consists of a one-year performance period based on our financial performance and a two-year vesting period. At the discretion of the compensation committee and determined based on our performance, the eligible officer or key employee will be granted a percentage of the provisional cash award units that equates to the EBITAC growth achieved (as defined in the Program). At the end of the performance period, eligible participants will be granted a number of units based on achievement of the performance goal and subject to approval by the compensation committee. Granted units for the 2015 provisional award will fully vest based on continuous employment through January 1, 2018. For certain of our executive officers age 55 or older, awards granted under the Program in 2015 are no longer subject to forfeiture upon such officers’ departure from the company after two years from the date of the provisional award. The ultimate award value will be equal to the trailing twelve-month price of our common stock on December 31, 2017, multiplied by the number of units subject to the award, but limited to between 0.5 and 1.5 times the original value of the units determined as of the grant date. The fair value of the awarded units will be paid out in cash as soon as practicable in 2018. If an eligible employee leaves us prior to the vesting date, the entire award will be forfeited. We did not recognize any compensation expense during the nine-month period ended September 30, 2015 related to the 2015 provisional award under the Program. On March 12, 2014, pursuant to the Program, the compensation committee approved provisional cash awards of $10.8 million in the aggregate for future grant to our officers and key employees that are denominated in units (229,000 units in the aggregate), each of which was equivalent to the value of one share of our common stock on the date the provisional awards were approved. Terms of the 2014 provisional awards were similar to the terms of the 2015 provisional awards. Based on our performance for 2014, we granted 220,000 units under the Program in first quarter 2015 that will fully vest on January 1, 2017. During the three-month period ended September 30, 2015, we recognized $1.2 million to compensation expense related to these awards. During the nine-month period ended September 30, 2015, we recognized $3.7 million to compensation expense related to these awards. We did not recognize any compensation expense during 2014 related to the 2014 awards. On March 13, 2013, pursuant to the Program, the compensation committee approved provisional cash awards of $10.5 million in the aggregate for future grant to our officers and key employees that are denominated in units (269,000 units in the aggregate), each of which was equivalent to the value of one share of our common stock on the date the provisional awards were approved. Terms of the 2013 provisional awards were similar to the terms of the 2015 provisional awards. Based on our performance for 2013, we granted 263,000 units under the Program in first quarter 2014 that will fully vest on January 1, 2016. During the three-month periods ended September 30, 2015 and September 30, 2014, we recognized $1.3 million and $1.5 million, respectively, to compensation expense related to the 2013 awards. During the nine-month periods ended September 30, 2015 and September 30, 2014, we recognized $4.3 million and $4.5 million, respectively, to compensation expense related to the 2013 awards. On March 16, 2012, pursuant to the Program, the compensation committee approved provisional cash awards of $13.1 million in the aggregate for future grant to our officers and key employees that are denominated in units (368,000 units in the aggregate), each of which was equivalent to the value of one share of our common stock on the date the provisional awards were approved. Terms of the 2012 provisional awards were similar to the terms of the 2015 provisional awards. Based on our performance for 2012, we granted 365,000 units under the Program in first quarter 2013 that fully vested on January 1, 2015. During the three-month period ended September 30, 2014 we recognized $1.8 million of compensation expense related to the 2012 awards. During the nine-month period ended September 30, 2014 we recognized $6.3 million of compensation expense related to the 2012 awards. We did not recognize any compensation expense during 2015 related to the 2012 awards. During the nine-month period ended September 30, 2015, cash awards related to the 2012 provisional award with an aggregate fair value of $15.8 million (0.3 million units in the aggregate) were vested and distributed to employees under the Program.

Retirement Plans

Retirement Plans	9 Months Ended
	Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]
Retirement Plans	11. Retirement Plans We have a noncontributory defined benefit pension plan that, prior to July 1, 2005, covered substantially all of our domestic employees who had attained a specified age and one year of employment. Benefits under the plan were based on years of service and salary history. In 2005, we amended our defined benefit pension plan to freeze the accrual of future benefits for all U.S. employees, effective on July 1, 2005. In the table below, the service cost component represents plan administration costs that are incurred directly by the plan. The components of the net periodic pension benefit cost for the plan consists of the following (in millions): Three-month period ended Nine-month period ended 2015 2014 2015 2014 Service cost $ 0.3 $ 0.1 $ 0.8 $ 0.3 Interest cost on benefit obligation 2.7 3.2 8.1 9.6 Expected return on plan assets (3.8 ) (4.7 ) (11.5 ) (14.1 ) Amortization of net actuarial loss 1.5 0.6 4.7 1.8 Net periodic benefit cost (earnings) $ 0.7 $ (0.8 ) $ 2.1 $ (2.4 ) We are not required under the IRC to make any minimum contributions to the plan for the 2015 plan year nor were we required to make any minimum contributions to the plan for the 2014 plan year. This level of required funding is based on the plan being frozen and the aggregate amount of our historical funding. We did not make any discretionary contributions to the plan during the nine-month periods ended September 30, 2015 and 2014.

Investments

Investments	9 Months Ended
	Sep. 30, 2015
Equity Method Investments and Joint Ventures [Abstract]
Investments	12. Investments The following is a summary of our investments and the related funding commitments (in millions): September 30, 2015 December 31, Funding 2014 Assets Commitments Assets Chem-Mod LLC $ 4.0 $ — $ 4.0 Chem-Mod International LLC 2.0 — 2.0 C-Quest Technologies LLC and C-Quest Technologies International LLC — — — Clean-coal investments: Controlling interest in five limited liability companies that own fourteen 2009 Era Clean Coal Plants 14.8 — 17.3 Non-controlling interest in one limited liability company that owns one 2011 Era Clean Coal Plant 0.9 — 1.0 Controlling interest in fifteen limited liability companies that own nineteen 2011 Era Clean Coal Plants 57.2 5.7 54.5 Other investments 2.6 2.9 3.2 Total investments $ 81.5 $ 8.6 $ 82.0 Chem-Mod LLC Chem-Mod™ coal-fired We believe that the application of The Chem-Mod™ Solution qualifies for refined coal tax credits under IRC Section 45 when used with refined coal production plants placed in service by December 31, 2011 or 2009. Chem-Mod Chem-Mod is determined to be a variable interest entity (which we refer to as a VIE). We are the controlling manager of Chem-Mod and therefore consolidate its operations into our consolidated financial statements. At September 30, 2015, total assets and total liabilities of this VIE included in our consolidated balance sheet were $11.3 million and $1.1 million, respectively. For the nine-month period ended September 30, 2015, total revenues and expenses were $55.2 million and $2.2 million, respectively. We are under no obligation to fund Chem-Mod’s operations in the future. Chem-Mod International LLC C-Quest Technologies LLC and C-Quest Technologies International LLC (together, C-Quest) C-Quest’s C-Quest C-Quest C-Quest, C-Quest’s C-Quest’s Clean Coal Investments - • We have investments in limited liability companies that own 34 refined coal production plants which produce refined coal using propriety technologies owned by Chem-Mod. We believe the production and sale of refined coal at these plants is qualified to receive refined coal tax credits under IRC Section 45. The fourteen plants placed in service prior to December 31, 2009 (which we refer to as the 2009 Era Plants) are eligible to receive tax credits through 2019 and the twenty plants placed in service prior to December 31, 2011 (which we refer to as the 2011 Era Plants) are eligible to receive tax credits through 2021. • On March 1, 2013, we purchased an additional ownership interest in twelve of the 2009 Era Plants from a co-investor. • On March 1, 2014, we purchased additional ownership interests from a co-investor in four limited liability companies that own seven 2009 Era Plants and five 2011 Era Plants. We recognized a gain of $25.6 million as a component of other net revenues in the accompanying unaudited consolidated statement of earnings, which included the increase in fair value of our prior equity interests in the limited liability companies upon the acquisition of the additional equity interests, and recorded $26.3 million of fixed and other amortizable intangible assets in connection with this transaction. The carrying value of our prior non-controlling interest in the limited liability company was $15.6 million as of the acquisition date. The fair value of our prior non-controlling • As of September 30, 2015: • Twenty-nine of the plants have long-term production contracts. • The remaining five plants are in various stages of seeking and negotiating long-term production contracts. • We have a non-controlling interest in one plant, which is owned by a limited liability company (which we refer to as a LLC). We have determined that this LLC is a VIE, for which we are not the primary beneficiary. At September 30, 2015, total assets and total liabilities of this VIE were $9.1 million and $6.4 million, respectively. For the nine-month period ended September 30, 2015, total revenues and expenses of this VIE were $30.1 million and $36.9 million, respectively. • We and our co-investors each fund our portion of the on-going operations of the limited liability companies in proportion to our investment ownership percentages. Other than our portion of the on-going operational funding, there are no additional amounts that we are committed to related to funding these investments. Other Investments -

Commitments, Contingencies and

Commitments, Contingencies and Off-Balance Sheet Arrangements	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments, Contingencies and Off-Balance Sheet Arrangements	13. Commitments, Contingencies and Off-Balance Sheet Arrangements In connection with our investing and operating activities, we have entered into certain contractual obligations and commitments. See Notes 6 and 12 to these unaudited consolidated financial statements for additional discussion of these obligations and commitments. Our future minimum cash payments, including interest, associated with our contractual obligations pursuant to the note purchase agreements, Credit Agreement, Premium Financing Debt Facility, operating leases and purchase commitments at September 30, 2015 were as follows (in millions): Payments Due by Period Contractual Obligations 2015 2016 2017 2018 2019 Thereafter Total Note purchase agreements $ — $ 50.0 $ 300.0 $ 100.0 $ 100.0 $ 1,575.0 $ 2,125.0 Credit Agreement 153.0 — — — — — 153.0 Premium Financing Debt Facility 114.6 — — — — — 114.6 Interest on debt 22.4 100.4 97.5 77.5 73.2 323.9 694.9 Total debt obligations 290.0 150.4 397.5 177.5 173.2 1,898.9 3,087.5 Operating lease obligations 26.2 95.6 85.5 66.4 53.7 176.1 503.5 Less sublease arrangements (1.2 ) (0.7 ) (0.3 ) (0.1 ) — (0.1 ) (2.4 ) Outstanding purchase obligations 20.2 15.5 9.6 6.8 6.5 6.2 64.8 Total contractual obligations $ 335.2 $ 260.8 $ 492.3 $ 250.6 $ 233.4 $ 2,081.1 $ 3,653.4 The amounts presented in the table above may not necessarily reflect our actual future cash funding requirements, because the actual timing of future payments may vary from the stated contractual obligation. Note Purchase Agreements, Credit Agreement and Premium Financing Debt Facility Operating Lease Obligations We generally operate in leased premises at our other locations. Certain of these leases have options permitting renewals for additional periods. In addition to minimum fixed rentals, a number of leases contain annual escalation clauses which are generally related to increases in an inflation index. We have leased certain office space to several non-affiliated tenants under operating sublease arrangements. In the normal course of business, we expect that certain of these leases will not be renewed or replaced. We adjust charges for real estate taxes and common area maintenance annually based on actual expenses, and we recognize the related revenues in the year in which the expenses are incurred. These amounts are not included in the minimum future rentals to be received in the contractual obligations table above. Outstanding Purchase Obligations Off-Balance Sheet Commitments Amount of Commitment Expiration by Period Total Committed Off-Balance Sheet Commitments 2015 2016 2017 2018 2019 Thereafter Letters of credit $ — $ — $ — $ — $ — $ 23.1 $ 23.1 Financial guarantees 0.7 0.7 0.7 0.7 0.8 14.9 18.5 Funding commitments 51.7 41.8 2.7 — 1.5 1.4 99.1 Total commitments $ 52.4 $ 42.5 $ 3.4 $ 0.7 $ 2.3 $ 39.4 $ 140.7 Since commitments may expire unused, the amounts presented in the table above do not necessarily reflect our actual future cash funding requirements. See Note 12 to our unaudited consolidated financial statements for a discussion of our funding commitments related to our corporate segment and the Off-Balance Since January 1, 2002, we have acquired 368 companies, all of which were accounted for using the acquisition method for recording business combinations. Substantially all of the purchase agreements related to these acquisitions contain provisions for potential earnout obligations. For all of our acquisitions made in the period from 2012 to 2015 that contain potential earnout obligations, such obligations are measured at fair value as of the acquisition date and are included on that basis in the recorded purchase price consideration for the respective acquisition. The amounts recorded as earnout payables are primarily based upon estimated future operating results of the acquired entities over a two- to three-year period subsequent to the acquisition date. The aggregate amount of the maximum earnout obligations related to these acquisitions was $580.8 million, of which $223.6 million was recorded in our consolidated balance sheet as of September 30, 2015 based on the estimated fair value of the expected future payments to be made. See Note 3 to these unaudited consolidated financial statements for a discussion of our funding commitments related to our acquisitions we signed and completed in 2015. Off-Balance Sheet Debt - At September 30, 2015, we had posted two letters of credit totaling $11.3 million, in the aggregate, related to our self-insurance Litigation, Regulatory and Taxation Matters - non-compete In July 2014, we were named in a lawsuit that asserts that we, our subsidiary, Gallagher Clean Energy, LLC, and Chem-Mod LLC are liable for infringement of a patent held by Nalco Company. The complaint seeks a judgment of infringement, damages, costs and attorneys’ fees, and injunctive relief. We and the other defendants dispute the allegations contained in the complaint and intend to defend this matter vigorously. On September 30, 2014, we filed a motion to dismiss the complaint on behalf of all defendants. On February 4, 2015, our motion to dismiss was granted by the court; however, the court also granted Nalco Company leave to file an amended complaint, which Nalco did on March 3, 2015. We filed a second motion to dismiss, which was granted by the court on October 15, 2015. Although the court granted Nalco Company leave to file a further amended complaint, we believe that the probability of a material loss is remote. However, litigation is inherently uncertain and it is not possible for us to predict the ultimate disposition of this proceeding. During January and February 2015, five senior employees of our U.K.-based international brokerage operation, including the chief executive officer and chief financial officer, resigned from the company and disclosed that they intend to work for another insurance brokerage firm. In April 2015, we commenced litigation against the former chief executive officer, the former chief financial officer and a third-party financial advisor. Among other things, the litigation sought damages for breach of fiduciary duty, breach of contract and taking of corporate opportunities. On August 26, 2015, we announced that we had settled the litigation for total payments to us of approximately £20.0 million (or $31.0 million). In addition, certain of the former executives agreed to repay employee loans and retention awards totaling approximately £2.0 million (or $3.1 million). During the three-month and nine-month periods ended, September 30, 2015, we recognized a pretax gain of $31.0 million related to this settlement, which has been included in other net revenues in the consolidated statement of earnings. Our micro-captive advisory services are under investigation by the Internal Revenue Service (IRS). Additionally, the IRS has initiated audits for the 2012 tax year of over 100 of the micro-captive insurance companies organized and/or managed by us. Among other matters, the IRS is investigating whether we have been acting as a tax shelter promoter in connection with these operations. While the IRS has not made specific allegations relating to our operations, if the IRS were to successfully assert that the micro-captives organized and/or managed by us do not meet the requirements of IRC Section 831(b), we could be subject to monetary claims by the IRS and/or our micro-captive clients, and our future earnings from our micro-captive operations could be materially adversely affected, any of which events, could negatively impact the overall captive business and adversely affect our consolidated results of operations and financial condition. Due to the early stage of the investigation and the fact that the IRS has not made any allegation against us, we are not able to reasonably estimate the amount of any potential loss in connection with this investigation. Contingent Liabilities - Tax-advantaged Investments No Longer Held -

Accumulated Other Comprehensive

Accumulated Other Comprehensive Earnings (Loss)	9 Months Ended
	Sep. 30, 2015
Equity [Abstract]
Accumulated Other Comprehensive Earnings (Loss)	14. Accumulated Other Comprehensive Earnings (Loss) The after-tax components of our accumulated other comprehensive earnings (loss) attributable to controlling interests consist of the following: Pension Liability Foreign Currency Translation Fair Value of Derivative Investments Accumulated Comprehensive Earnings (Loss) Balance as of December 31, 2014 $ (44.2 ) $ (216.3 ) $ (0.1 ) $ (260.6 ) Net change in period 1.3 (237.9 ) 0.9 (235.7 ) Balance as of September 30, 2015 $ (42.9 ) $ (454.2 ) $ 0.8 $ (496.3 ) The foreign currency translation during the nine-month period ended September 30, 2015 primarily relates to the net impact of changes in the value of the local currencies relative to the U.S. dollar for our operations in Australia, Canada, the Caribbean, India, New Zealand and the U.K. During the nine-month periods ended September 30, 2015 and 2014, $4.7 million and $1.8 million, respectively, of expense related to the pension liability was reclassified from accumulated other comprehensive earnings (loss) to compensation expense in the statement of earnings. During the nine-month periods ended September 30, 2015 and 2014, $0.1 million of income and $0.5 million of expense, respectively, related to the fair value of derivative investments, was reclassified from accumulated other comprehensive earnings (loss) to the statement of earnings. During the nine-month

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Segment Information	15. Segment Information We have three reportable segments: brokerage, risk management and corporate. The brokerage segment is primarily comprised of our retail and wholesale insurance brokerage operations. The brokerage segment generates revenues through commissions paid by insurance underwriters and through fees charged to our clients. Our brokers, agents and administrators act as intermediaries between insurers and their customers and we do not assume underwriting risks. The risk management segment provides contract claim settlement and administration services for enterprises that choose to self-insure some or all of their property/casualty coverages and for insurance companies that choose to outsource some or all of their property/casualty claims departments. These operations also provide claims management, loss control consulting and insurance property appraisal services. Revenues are principally generated on a negotiated per-claim or per-service fee basis. The corporate segment manages our clean energy and other investments. In addition, the corporate segment reports the financial information related to our debt, and certain corporate and acquisition-related activities. During the three-month and nine-month periods ended September 30, 2015, we recognized a pretax gain of $31.0 million related to a litigation settlement in this segment. See Note 13 - Litigation, Regulatory and Taxation Matters for a further discussion of this matter. Allocations of investment income and certain expenses are based on what management believes are reasonable assumptions and estimates primarily using revenue, headcount and other information. We allocate the provision for income taxes to the brokerage and risk management segments using the local country statutory rates. Reported operating results by segment would change if different methods were applied. See Note 1 to these unaudited consolidated financial statements for a discussion of a reclassification of amounts between the brokerage and risk management segments. Financial information relating to our segments for the three-month and nine-month periods ended September 30, 2015 and 2014 is as follows (in millions): Three-month period Nine-month period ended September 30, ended September 30, 2015 2014 2015 2014 Brokerage Total revenues $ 835.5 $ 795.2 $ 2,472.2 $ 2,097.5 Earnings before income taxes $ 122.5 $ 123.8 $ 340.1 $ 310.3 Identifiable assets at September 30, 2015 and 2014 $ 8,638.2 $ 8,377.1 Risk Management Total revenues $ 179.2 $ 172.9 $ 545.8 $ 509.9 Earnings before income taxes $ 22.4 $ 21.0 $ 72.7 $ 60.9 Identifiable assets at September 30, 2015 and 2014 $ 640.4 $ 621.0 Corporate Total revenues $ 440.1 $ 318.7 $ 1,039.5 $ 773.7 Loss before income taxes $ (39.2 ) $ (49.4 ) $ (147.7 ) $ (109.2 ) Identifiable assets at September 30, 2015 and 2014 $ 1,231.8 $ 989.9

Effect of New Accounting Pron24

Effect of New Accounting Pronouncements (Policies)	9 Months Ended
	Sep. 30, 2015
Accounting Changes and Error Corrections [Abstract]
Consolidations	Consolidations In February 2015, the Financial Accounting Standards Board (which we refer to as the FASB) issued new accounting guidance on consolidations, which eliminates the deferral granted to investment companies from applying the variable interest entities guidance and makes targeted amendments to the current consolidation guidance. The new guidance applies to all entities involved with limited partnerships or similar entities and will require re-evaluation of these entities under the revised guidance, which could change previous consolidation conclusions. The guidance is effective in first quarter of 2016. Management is currently reviewing the guidance, and the impact from its adoption on our consolidated financial statements cannot be determined at this time.
Debt Issuance Costs	Debt Issuance Costs In April 2015, the FASB issued new accounting guidance on the presentation of debt issuance costs, which requires debt issuance costs to be presented in the balance sheet as a direct deduction from the associated debt liability. The new guidance will be applied on a retrospective basis and is effective in first quarter of 2016. The adoption of this guidance is not expected to have a material impact on our consolidated financial statements.
Business Combinations	Business Combinations In September 2015, the FASB issued new accounting guidance on the accounting for measurement-period adjustments, which requires that measurement period adjustments be recognized in the reporting period in which the adjustment amount is determined rather than retrospectively applying the change to the acquisition date. The new guidance will be applied and is effective in first quarter of 2016. The adoption of this guidance is not expected to have a material impact on our consolidated financial statements.
Revenue Recognition	Revenue Recognition In May 2014, the FASB issued new accounting guidance on revenue from contracts with customers, which will supersede nearly all existing revenue recognition guidance under U.S. GAAP. The core principal of the new guidance is that an entity should recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. On July 9, 2015, the FASB decided to delay the effective date of the new revenue standard by one year. Reporting entities may choose to adopt the standard as of the original effective date. The FASB decided, based on its outreach to various stakeholders and the forthcoming amendments to the new revenue standard, that a deferral is necessary to provide adequate time to effectively implement the new revenue standard. This new guidance was originally effective for the first quarter of 2017 and early adoption is not permitted. With the one year deferral date, this new guidance is now effective for the first quarter of 2018, but it can be adopted earlier in first quarter of 2017. The guidance permits two methods of transition upon adoption; full retrospective and modified retrospective. Under the full retrospective method, prior periods would be restated under the new revenue standard, providing a comparable view across all periods presented. Under the modified retrospective method, prior periods would not be restated. Rather, revenues and other disclosures for pre-2017/2018 periods would be provided in the notes to the financial statements as previously reported under the current revenue standard. Management is currently reviewing the guidance, and the impact from its adoption on our consolidated financial statements cannot be determined at this time.

Nature of Operations and Basi25

Nature of Operations and Basis of Presentation (Tables)	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Effect of Immaterial Changes to Presentation of Consolidated Statement of Earnings	The effect of the immaterial changes to the presentation of our consolidated statement of earnings for the three-month and nine-month Three-month period ended September 30, Nine-month period ended September 30, As Previously As Restated As Previously As Restated Operating expense $ 205.0 $ 197.3 $ 546.2 $ 525.3 Earnings before income taxes $ 87.7 $ 95.4 $ 241.1 $ 262.0 Benefit for income taxes (5.9 ) (5.9 ) (10.8 ) (10.8 ) Net earnings $ 93.6 101.3 $ 251.9 272.8 Net earnings attributable to noncontrolling interests 7.7 20.9 Net earnings attributable to controlling interests $ 93.6 $ 251.9 Basic net earnings per share $ 0.58 $ 0.58 $ 1.68 $ 1.68 Diluted net earnings per share $ 0.58 $ 0.58 $ 1.67 $ 1.67

Business Combinations (Tables)

Business Combinations (Tables)	9 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Acquisition Method for Recording Business Combinations	During the nine-month period ended September 30, 2015, we acquired substantially all of the net assets of the following firms in exchange for our common stock and/or cash. These acquisitions have been accounted for using the acquisition method for recording business combinations (in millions except share data): Name and Effective Date of Acquisition Common Shares Issued Common Share Value Cash Paid Accrued Liability Escrow Deposited Recorded Earnout Payable Total Recorded Purchase Price Maximum Potential Earnout Payable (000s) e3 Financial, Inc. January 1, 2015 2 $ — $ 9.1 $ — $ 0.1 $ 0.7 $ 9.9 $ 7.0 Aequus Trade Credit LLC January 31, 2015 11 0.3 1.5 — 0.2 1.3 3.3 1.9 Cohen & Lord Insurance Brokers Limited February 1, 2015 77 3.6 2.1 — — — 5.7 — Cohn Financial Group, LLC (CFG) February 1, 2015 407 19.0 — — 0.3 4.1 23.4 14.0 Excel Insurance Services, Inc. February 1, 2015 52 1.5 7.3 — 1.0 — 9.8 — Metcom Excess February 1, 2015 49 1.8 2.3 — 0.5 — 4.6 — NationAir Aviation Insurance February 1, 2015 288 12.3 — — 1.3 — 13.6 — Evolution Group of Companies February 6, 2015 101 4.7 0.9 0.5 0.4 2.9 9.4 3.1 Burns-Fazzi, Brock & Associates, LLC (BFB) April 1, 2015 709 33.4 — — 1.0 7.4 41.8 27.0 Madison Risk & Insurance Services, Inc. (MRI) April 1, 2015 232 10.3 3.7 — 1.0 1.4 16.4 4.0 Integrated Healthcare Strategies, LLC (IHS) May 1, 2015 990 41.4 0.5 3.1 6.2 4.5 55.7 20.8 James R. Weir Insurance Agency, Inc. May 1, 2015 56 2.5 — — 0.3 0.8 3.6 1.1 McDowall Associates Human Resources Consultants Ltd. May 1, 2015 34 1.5 0.6 0.6 0.1 0.5 3.3 2.5 Vital Benefits, Inc. May 1, 2015 118 5.6 — — 0.1 — 5.7 — Monument, LLC (ML) June 1, 2015 254 10.8 4.0 — 1.7 2.4 18.9 5.0 Solid Benefit Guidance Limited Liability Company (SBG) June 1, 2015 932 44.0 0.3 2.5 1.0 11.6 59.4 32.5 ARM Re Ltda Corredores de Reaseguros July 1, 2015 — — 0.9 — 0.7 0.2 1.8 0.5 National Administration Company, Inc. (NAC) August 1, 2015 — — 19.1 — 2.1 2.8 24.0 10.8 William Gallagher Associates Insurance Brokers, Inc. (WGA) August 1, 2015 1,605 69.0 75.0 — 7.5 — 151.5 — North Alabama Insurance, Inc. September 1, 2015 188 7.2 — — 0.8 — 8.0 — Nine other acquisitions completed in 2015 128 6.0 13.1 0.4 1.1 3.6 24.2 32.2 6,233 $ 274.9 $ 140.4 $ 7.1 $ 27.4 $ 44.2 $ 494.0 $ 162.4
Summary of Estimated Fair Values of Net Assets Acquired	The following is a summary of the estimated fair values of the net assets acquired at the date of each acquisition made in the nine-month period ended September 30, 2015 (in millions): CFG BFB MRI IHS ML SBG NAC WGA Twenty-One Total Cash $ 0.1 $ 0.1 $ 0.1 $ — $ — $ — $ 0.3 $ — $ 3.2 $ 3.8 Other current assets — 0.3 0.6 8.3 0.2 1.4 — 63.4 29.2 103.4 Fixed assets — — — 1.1 — — 0.2 0.6 5.5 7.4 Noncurrent assets — — — — — — — 0.1 0.6 0.7 Goodwill 13.6 18.5 6.3 24.8 5.7 30.9 6.9 86.8 52.3 245.8 Expiration lists 9.6 23.0 9.9 24.8 13.0 27.7 16.5 62.7 46.1 233.3 Non-compete agreements 0.1 0.1 0.1 0.1 — 0.1 0.1 0.3 1.1 2.0 Total assets acquired 23.4 42.0 17.0 59.1 18.9 60.1 24.0 213.9 138.0 596.4 Current liabilities — 0.2 0.6 3.4 — 0.7 — 62.4 24.2 91.5 Noncurrent liabilities — — — — — — — — 10.9 10.9 Total liabilities assumed — 0.2 0.6 3.4 — 0.7 — 62.4 35.1 102.4 Total net assets acquired $ 23.4 $ 41.8 $ 16.4 $ 55.7 $ 18.9 $ 59.4 $ 24.0 $ 151.5 $ 102.9 $ 494.0
Summary of Unaudited Pro Forma Historical Results	The following is a summary of the unaudited pro forma historical results, as if these entities had been acquired at January 1, 2014 (in millions, except per share data): Three-month period ended September 30, Nine-month period ended September 30, 2015 2014 2015 2014 Total revenues $ 1,461.7 $ 1,332.5 $ 4,133.3 $ 3,518.2 Net earnings attributable to controlling interests 134.2 96.0 301.7 260.6 Basic net earnings per share 0.76 0.58 1.73 1.67 Diluted net earnings per share 0.76 0.57 1.72 1.66

Other Current Assets (Tables)

Other Current Assets (Tables)	9 Months Ended
	Sep. 30, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Summary of Major Classes of Other Current Assets	Major classes of other current assets consist of the following (in millions): September 30, December 31, 2015 2014 Premium finance advances and loans $ 217.0 $ 232.6 Accrued supplemental, direct bill and other receivables 167.6 156.3 Refined coal production related receivables 135.0 103.5 Deferred income taxes - current 109.4 102.2 Prepaid expenses 71.0 72.1 Total other current assets $ 700.0 $ 666.7

Intangible Assets (Tables)

Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations	The carrying amount of goodwill at September 30, 2015 and December 31, 2014 allocated by domestic and foreign operations is as follows (in millions): Risk Brokerage Management Corporate Total At September 30, 2015 United States $ 1,885.2 $ 23.5 $ — $ 1,908.7 United Kingdom 803.3 3.6 — 806.9 Canada 293.3 — — 293.3 Australia 342.9 — — 342.9 Other foreign, principally New Zealand 227.5 0.3 — 227.8 Total goodwill - net $ 3,552.2 $ 27.4 $ — $ 3,579.6 At December 31, 2014 United States $ 1,652.6 $ 20.2 $ — $ 1,672.8 United Kingdom 818.7 1.9 — 820.6 Canada 318.5 — — 318.5 Australia 336.8 — — 336.8 Other foreign, principally New Zealand 300.9 — — 300.9 Total goodwill - net $ 3,427.5 $ 22.1 $ — $ 3,449.6
Changes in Carrying Amount of Goodwill	The changes in the carrying amount of goodwill for the nine-month period ended September 30, 2015 are as follows (in millions): Risk Brokerage Management Corporate Total Balance as of December 31, 2014 $ 3,427.5 $ 22.1 $ — $ 3,449.6 Goodwill acquired during the period 243.8 2.0 — 245.8 Goodwill related to transfer of operations between segments (3.4 ) 3.4 — — Goodwill adjustments due to appraisals and other acquisition adjustments 34.8 — — 34.8 Foreign currency translation adjustments during the period (150.5 ) (0.1 ) — (150.6 ) Balance as of September 30, 2015 $ 3,552.2 $ 27.4 $ — $ 3,579.6
Major Classes of Amortizable Intangible Assets	Major classes of amortizable intangible assets at September 30, 2015 and December 31, 2014 consist of the following (in millions): September 30, December 31, 2015 2014 Expiration lists $ 2,590.7 $ 2,461.9 Accumulated amortization - expiration lists (870.4 ) (719.3 ) 1,720.3 1,742.6 Non-compete agreements 42.2 43.2 Accumulated amortization - non-compete agreements (33.4 ) (29.5 ) 8.8 13.7 Trade names 26.1 29.7 Accumulated amortization - trade names (13.4 ) (10.0 ) 12.7 19.7 Net amortizable assets $ 1,741.8 $ 1,776.0
Estimated Aggregate Amortization Expense	Estimated aggregate amortization expense for each of the next five years is as follows: 2015 (remaining three months) $ 58.4 2016 228.7 2017 218.3 2018 204.3 2019 190.8 Total $ 900.5

Credit and Other Debt Agreeme29

Credit and Other Debt Agreements (Tables)	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Summary of Corporate and Other Debt	The following is a summary of our corporate and other debt (in millions): September 30, December 31, 2015 2014 Note Purchase Agreements: Semi-annual payments of interest, fixed rate of 6.44%, balloon due 2017 $ 300.0 $ 300.0 Semi-annual payments of interest, fixed rate of 5.85%, $50 million due in 2016, 2018 and 2019 150.0 150.0 Semi-annual payments of interest, fixed rate of 2.80%, balloon due 2018 50.0 50.0 Semi-annual payments of interest, fixed rate of 3.20%, balloon due 2019 50.0 50.0 Semi-annual payments of interest, fixed rate of 3.99%, balloon due 2020 50.0 50.0 Semi-annual payments of interest, fixed rate of 3.48%, balloon due 2020 50.0 50.0 Semi-annual payments of interest, fixed rate of 5.18%, balloon due 2021 75.0 75.0 Semi-annual payments of interest, fixed rate of 3.69%, balloon due 2022 200.0 200.0 Semi-annual payments of interest, fixed rate of 5.49%, balloon due 2023 50.0 50.0 Semi-annual payments of interest, fixed rate of 4.13%, balloon due 2023 200.0 200.0 Semi-annual payments of interest, fixed rate of 4.58%, balloon due 2024 325.0 325.0 Semi-annual payments of interest, fixed rate of 4.31%, balloon due 2025 200.0 200.0 Semi-annual payments of interest, fixed rate of 4.73%, balloon due 2026 175.0 175.0 Semi-annual payments of interest, fixed rate of 4.36%, balloon due 2026 150.0 150.0 Semi-annual payments of interest, fixed rate of 4.98%, balloon due 2029 100.0 100.0 Total Note Purchase Agreements 2,125.0 2,125.0 Credit Agreement: Periodic payments of interest and principal, prime or LIBOR plus up to 1.45%, expires September 19, 2018 153.0 140.0 Premium Financing Debt Facility - expires May 18, 2017: Periodic payments of interest and principal, Interbank rates plus 1.05% for Facility B; plus 0.55% for Facilities C and D Facility B AUD denominated tranche 91.8 95.0 NZD denominated tranche 7.9 17.8 Facility C and D AUD denominated tranche 5.4 7.7 NZD denominated tranche 9.5 7.4 Total Premium Financing Debt Facility 114.6 127.9 Total corporate and other debt $ 2,392.6 $ 2,392.9

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Computation of Basic and Diluted Net EPS	The following table sets forth the computation of basic and diluted net earnings per share (in millions, except per share data): Three-month period ended September 30, Nine-month period ended 2015 2014 2015 2014 Net earnings attributable to controlling interests $ 133.3 $ 93.6 $ 294.5 $ 251.9 Weighted average number of common shares outstanding 176.0 160.2 170.7 149.6 Dilutive effect of stock options using the treasury stock method 0.8 1.3 1.1 1.4 Weighted average number of common and common equivalent shares outstanding 176.8 161.5 171.8 151.0 Basic net earnings per share $ 0.76 $ 0.58 $ 1.73 $ 1.68 Diluted net earnings per share $ 0.75 $ 0.58 $ 1.71 $ 1.67

Stock Option Plans (Tables)

Stock Option Plans (Tables)	9 Months Ended
	Sep. 30, 2015
Text Block [Abstract]
Black-Scholes Option Pricing Model with Weighted Average	For purposes of expense recognition, the estimated fair values of the stock option grants are amortized to expense over the options’ vesting period. We estimated the fair value of stock options at the date of grant using the Black-Scholes option pricing model with the following weighted average assumptions: 2015 2014 Expected dividend yield 3.0 % 3.0 % Expected risk-free interest rate 1.8 % 1.8 % Volatility 28.2 % 28.9 % Expected life (in years) 5.5 5.5
Stock Option Activity and Related Information	The following is a summary of our stock option activity and related information for 2015 (in millions, except exercise price and year data): Nine-month period ended September 30, 2015 Shares Under Option Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value Beginning balance 8.4 $ 35.49 Granted 1.9 46.19 Exercised (1.4 ) 27.57 Forfeited or canceled — — Ending balance 8.9 $ 39.16 4.39 $ 39.3 Exercisable at end of period 2.2 $ 28.52 2.17 $ 27.5 Ending vested and expected to vest 8.7 $ 39.05 4.36 $ 39.2
Other Information Regarding Stock Options Outstanding and Exercisable	Other information regarding stock options outstanding and exercisable at September 30, 2015 is summarized as follows (in millions, except exercise price and year data): Options Outstanding Options Exercisable Range of Exercise Prices Number Outstanding Weighted Average Remaining Contractual Term (in years) Weighted Average Exercise Price Number Exercisable Weighted Average Exercise Price $ 21.28 - $ 35.71 3.3 2.53 $ 30.51 2.2 $ 28.51 35.95 - 46.17 3.6 5.52 42.93 — — 46.87 - 46.87 1.9 5.45 46.87 — — 47.92 - 47.92 0.1 6.58 47.92 — — $ 21.28 - $ 47.92 8.9 4.39 $ 39.16 2.2 $ 28.52

Retirement Plans (Tables)

Retirement Plans (Tables)	9 Months Ended
	Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]
Components of Net Periodic Pension Benefit Cost	The components of the net periodic pension benefit cost for the plan consists of the following (in millions): Three-month period ended Nine-month period ended 2015 2014 2015 2014 Service cost $ 0.3 $ 0.1 $ 0.8 $ 0.3 Interest cost on benefit obligation 2.7 3.2 8.1 9.6 Expected return on plan assets (3.8 ) (4.7 ) (11.5 ) (14.1 ) Amortization of net actuarial loss 1.5 0.6 4.7 1.8 Net periodic benefit cost (earnings) $ 0.7 $ (0.8 ) $ 2.1 $ (2.4 )

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2015
Equity Method Investments and Joint Ventures [Abstract]
Investments Reported in Other Current and Non-Current Assets	The following is a summary of our investments and the related funding commitments (in millions): September 30, 2015 December 31, Funding 2014 Assets Commitments Assets Chem-Mod LLC $ 4.0 $ — $ 4.0 Chem-Mod International LLC 2.0 — 2.0 C-Quest Technologies LLC and C-Quest Technologies International LLC — — — Clean-coal investments: Controlling interest in five limited liability companies that own fourteen 2009 Era Clean Coal Plants 14.8 — 17.3 Non-controlling interest in one limited liability company that owns one 2011 Era Clean Coal Plant 0.9 — 1.0 Controlling interest in fifteen limited liability companies that own nineteen 2011 Era Clean Coal Plants 57.2 5.7 54.5 Other investments 2.6 2.9 3.2 Total investments $ 81.5 $ 8.6 $ 82.0

Commitments, Contingencies an34

Commitments, Contingencies and Off-Balance Sheet Arrangements (Tables)	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Contractual Obligations	Our future minimum cash payments, including interest, associated with our contractual obligations pursuant to the note purchase agreements, Credit Agreement, Premium Financing Debt Facility, operating leases and purchase commitments at September 30, 2015 were as follows (in millions): Payments Due by Period Contractual Obligations 2015 2016 2017 2018 2019 Thereafter Total Note purchase agreements $ — $ 50.0 $ 300.0 $ 100.0 $ 100.0 $ 1,575.0 $ 2,125.0 Credit Agreement 153.0 — — — — — 153.0 Premium Financing Debt Facility 114.6 — — — — — 114.6 Interest on debt 22.4 100.4 97.5 77.5 73.2 323.9 694.9 Total debt obligations 290.0 150.4 397.5 177.5 173.2 1,898.9 3,087.5 Operating lease obligations 26.2 95.6 85.5 66.4 53.7 176.1 503.5 Less sublease arrangements (1.2 ) (0.7 ) (0.3 ) (0.1 ) — (0.1 ) (2.4 ) Outstanding purchase obligations 20.2 15.5 9.6 6.8 6.5 6.2 64.8 Total contractual obligations $ 335.2 $ 260.8 $ 492.3 $ 250.6 $ 233.4 $ 2,081.1 $ 3,653.4
Off-Balance Sheet Commitments	Off-Balance Sheet Commitments Amount of Commitment Expiration by Period Total Committed Off-Balance Sheet Commitments 2015 2016 2017 2018 2019 Thereafter Letters of credit $ — $ — $ — $ — $ — $ 23.1 $ 23.1 Financial guarantees 0.7 0.7 0.7 0.7 0.8 14.9 18.5 Funding commitments 51.7 41.8 2.7 — 1.5 1.4 99.1 Total commitments $ 52.4 $ 42.5 $ 3.4 $ 0.7 $ 2.3 $ 39.4 $ 140.7

Accumulated Other Comprehensi35

Accumulated Other Comprehensive Earnings (Loss) (Tables)	9 Months Ended
	Sep. 30, 2015
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Earnings (Loss) Attributable to Controlling Interests	The after-tax components of our accumulated other comprehensive earnings (loss) attributable to controlling interests consist of the following: Pension Liability Foreign Currency Translation Fair Value of Derivative Investments Accumulated Comprehensive Earnings (Loss) Balance as of December 31, 2014 $ (44.2 ) $ (216.3 ) $ (0.1 ) $ (260.6 ) Net change in period 1.3 (237.9 ) 0.9 (235.7 ) Balance as of September 30, 2015 $ (42.9 ) $ (454.2 ) $ 0.8 $ (496.3 )

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Schedule of Segment Reporting Information by Segment	Financial information relating to our segments for the three-month and nine-month periods ended September 30, 2015 and 2014 is as follows (in millions): Three-month period Nine-month period ended September 30, ended September 30, 2015 2014 2015 2014 Brokerage Total revenues $ 835.5 $ 795.2 $ 2,472.2 $ 2,097.5 Earnings before income taxes $ 122.5 $ 123.8 $ 340.1 $ 310.3 Identifiable assets at September 30, 2015 and 2014 $ 8,638.2 $ 8,377.1 Risk Management Total revenues $ 179.2 $ 172.9 $ 545.8 $ 509.9 Earnings before income taxes $ 22.4 $ 21.0 $ 72.7 $ 60.9 Identifiable assets at September 30, 2015 and 2014 $ 640.4 $ 621.0 Corporate Total revenues $ 440.1 $ 318.7 $ 1,039.5 $ 773.7 Loss before income taxes $ (39.2 ) $ (49.4 ) $ (147.7 ) $ (109.2 ) Identifiable assets at September 30, 2015 and 2014 $ 1,231.8 $ 989.9

Nature of Operations and Basi37

Nature of Operations and Basis of Presentation - Additional Information (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)CountrySegment	Sep. 30, 2014USD ($)
Business And Basis Of Presentation [Line Items]
Number of countries in which the company has operations			31
Number of countries in which the company does business through a network of correspondent brokers and consultants			140
Number of reportable operating segments | Segment			3
Total revenues | $	$ 1,454.8	$ 1,286.8	$ 4,057.5	$ 3,381.1
Claims Handling Operation [Member] | Risk Management [Member]
Business And Basis Of Presentation [Line Items]
Total revenues | $	$ 4.9	$ 4.6	$ 14.7	$ 13.5

Nature of Operations and Basi38

Nature of Operations and Basis of Presentation - Effect of Immaterial Changes to Presentation of Consolidated Statement of Earnings (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Operating expense	$ 208.1	$ 197.3	$ 618.7	$ 525.3
Benefit for income taxes	35.2	5.9	55.8	10.8
Net earnings	140.9	101.3	320.9	272.8
Net earnings attributable to noncontrolling interests	(7.6)	(7.7)	(26.4)	(20.9)
Net earnings attributable to controlling interests	$ 133.3	$ 93.6	$ 294.5	$ 251.9
Basic net earnings per share	$ 0.76	$ 0.58	$ 1.73	$ 1.68
Diluted net earnings per share	$ 0.75	$ 0.58	$ 1.71	$ 1.67
As Previously Reported [Member]
Operating expense		$ 205		$ 546.2
Earnings before income taxes		87.7		241.1
Benefit for income taxes		(5.9)		(10.8)
Net earnings		$ 93.6		$ 251.9
Basic net earnings per share		$ 0.58		$ 1.68
Diluted net earnings per share		$ 0.58		$ 1.67
As Restated [Member]
Operating expense		$ 197.3		$ 525.3
Earnings before income taxes		95.4		262
Benefit for income taxes		(5.9)		(10.8)
Net earnings		101.3		272.8
Net earnings attributable to noncontrolling interests		7.7		20.9
Net earnings attributable to controlling interests		$ 93.6		$ 251.9
Basic net earnings per share		$ 0.58		$ 1.68
Diluted net earnings per share		$ 0.58		$ 1.67

Business Combinations - Acquisi

Business Combinations - Acquisition Method for Recording Business Combinations (Detail) shares in Thousands, $ in Millions	9 Months Ended
	Sep. 30, 2015USD ($)shares
Business Acquisition [Line Items]
Common Shares Issued | shares	6,233
Common Share Value	$ 274.9
Cash Paid	140.4
Accrued Liability	7.1
Escrow Deposited	27.4
Recorded Earnout Payable	44.2
Total Recorded Purchase Price	494
Maximum Potential Earnout Payable	$ 162.4
e3 Financial, Inc. [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	2
Common Share Value	$ 0
Cash Paid	9.1
Accrued Liability	0
Escrow Deposited	0.1
Recorded Earnout Payable	0.7
Total Recorded Purchase Price	9.9
Maximum Potential Earnout Payable	$ 7
Aequus Trade Credit LLC [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	11
Common Share Value	$ 0.3
Cash Paid	1.5
Accrued Liability	0
Escrow Deposited	0.2
Recorded Earnout Payable	1.3
Total Recorded Purchase Price	3.3
Maximum Potential Earnout Payable	$ 1.9
Cohen & Lord Insurance Brokers Limited [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	77
Common Share Value	$ 3.6
Cash Paid	2.1
Accrued Liability	0
Escrow Deposited	0
Recorded Earnout Payable	0
Total Recorded Purchase Price	5.7
Maximum Potential Earnout Payable	$ 0
Cohn Financial Group, LLC (CFG) [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	407
Common Share Value	$ 19
Cash Paid	0
Accrued Liability	0
Escrow Deposited	0.3
Recorded Earnout Payable	4.1
Total Recorded Purchase Price	23.4
Maximum Potential Earnout Payable	$ 14
Excel Insurance Services, Inc. [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	52
Common Share Value	$ 1.5
Cash Paid	7.3
Accrued Liability	0
Escrow Deposited	1
Recorded Earnout Payable	0
Total Recorded Purchase Price	9.8
Maximum Potential Earnout Payable	$ 0
Metcom Excess [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	49
Common Share Value	$ 1.8
Cash Paid	2.3
Accrued Liability	0
Escrow Deposited	0.5
Recorded Earnout Payable	0
Total Recorded Purchase Price	4.6
Maximum Potential Earnout Payable	$ 0
NationAir Aviation Insurance [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	288
Common Share Value	$ 12.3
Cash Paid	0
Accrued Liability	0
Escrow Deposited	1.3
Recorded Earnout Payable	0
Total Recorded Purchase Price	13.6
Maximum Potential Earnout Payable	$ 0
Evolution Group of Companies [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	101
Common Share Value	$ 4.7
Cash Paid	0.9
Accrued Liability	0.5
Escrow Deposited	0.4
Recorded Earnout Payable	2.9
Total Recorded Purchase Price	9.4
Maximum Potential Earnout Payable	$ 3.1
Burns-Fazzi, Brock & Associates, LLC (BFB) [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	709
Common Share Value	$ 33.4
Cash Paid	0
Accrued Liability	0
Escrow Deposited	1
Recorded Earnout Payable	7.4
Total Recorded Purchase Price	41.8
Maximum Potential Earnout Payable	$ 27
Madison Risk & Insurance Services, Inc. (MRI) [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	232
Common Share Value	$ 10.3
Cash Paid	3.7
Accrued Liability	0
Escrow Deposited	1
Recorded Earnout Payable	1.4
Total Recorded Purchase Price	16.4
Maximum Potential Earnout Payable	$ 4
Integrated Healthcare Strategies, LLC (IHS) [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	990
Common Share Value	$ 41.4
Cash Paid	0.5
Accrued Liability	3.1
Escrow Deposited	6.2
Recorded Earnout Payable	4.5
Total Recorded Purchase Price	55.7
Maximum Potential Earnout Payable	$ 20.8
James R. Weir Insurance Agency, Inc. [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	56
Common Share Value	$ 2.5
Cash Paid	0
Accrued Liability	0
Escrow Deposited	0.3
Recorded Earnout Payable	0.8
Total Recorded Purchase Price	3.6
Maximum Potential Earnout Payable	$ 1.1
McDowall Associates Human Resources Consultants Ltd. [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	34
Common Share Value	$ 1.5
Cash Paid	0.6
Accrued Liability	0.6
Escrow Deposited	0.1
Recorded Earnout Payable	0.5
Total Recorded Purchase Price	3.3
Maximum Potential Earnout Payable	$ 2.5
Vital Benefits, Inc. [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	118
Common Share Value	$ 5.6
Cash Paid	0
Accrued Liability	0
Escrow Deposited	0.1
Recorded Earnout Payable	0
Total Recorded Purchase Price	5.7
Maximum Potential Earnout Payable	$ 0
Monument, LLC (ML) [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	254
Common Share Value	$ 10.8
Cash Paid	4
Accrued Liability	0
Escrow Deposited	1.7
Recorded Earnout Payable	2.4
Total Recorded Purchase Price	18.9
Maximum Potential Earnout Payable	$ 5
Solid Benefit Guidance Limited Liability Company (SBG) [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	932
Common Share Value	$ 44
Cash Paid	0.3
Accrued Liability	2.5
Escrow Deposited	1
Recorded Earnout Payable	11.6
Total Recorded Purchase Price	59.4
Maximum Potential Earnout Payable	$ 32.5
ARM Re Ltda Corredores de Reaseguros [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	0
Common Share Value	$ 0
Cash Paid	0.9
Accrued Liability	0
Escrow Deposited	0.7
Recorded Earnout Payable	0.2
Total Recorded Purchase Price	1.8
Maximum Potential Earnout Payable	$ 0.5
National Administration Company, Inc. (NAC) [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	0
Common Share Value	$ 0
Cash Paid	19.1
Accrued Liability	0
Escrow Deposited	2.1
Recorded Earnout Payable	2.8
Total Recorded Purchase Price	24
Maximum Potential Earnout Payable	$ 10.8
William Gallagher Associates Insurance Brokers, Inc. (WGA) [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	1,605
Common Share Value	$ 69
Cash Paid	75
Accrued Liability	0
Escrow Deposited	7.5
Recorded Earnout Payable	0
Total Recorded Purchase Price	151.5
Maximum Potential Earnout Payable	$ 0
North Alabama Insurance, Inc. [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	188
Common Share Value	$ 7.2
Cash Paid	0
Accrued Liability	0
Escrow Deposited	0.8
Recorded Earnout Payable	0
Total Recorded Purchase Price	8
Maximum Potential Earnout Payable	$ 0
Nine Other Acquisitions [Member]
Business Acquisition [Line Items]
Common Shares Issued | shares	128
Common Share Value	$ 6
Cash Paid	13.1
Accrued Liability	0.4
Escrow Deposited	1.1
Recorded Earnout Payable	3.6
Total Recorded Purchase Price	24.2
Maximum Potential Earnout Payable	$ 32.2

Business Combinations - Acqui40

Business Combinations - Acquisition Method for Recording Business Combinations (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2015
e3 Financial, Inc. [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Jan. 1, 2015
Aequus Trade Credit LLC [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Jan. 31, 2015
Cohen & Lord Insurance Brokers Limited [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Feb. 1, 2015
Cohn Financial Group, LLC (CFG) [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Feb. 1, 2015
Excel Insurance Services, Inc. [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Feb. 1, 2015
Metcom Excess [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Feb. 1, 2015
NationAir Aviation Insurance [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Feb. 1, 2015
Evolution Group of Companies [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Feb. 6, 2015
Burns-Fazzi, Brock & Associates, LLC (BFB) [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Apr. 1, 2015
Madison Risk & Insurance Services, Inc. (MRI) [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Apr. 1, 2015
Integrated Healthcare Strategies, LLC (IHS) [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	May 1, 2015
James R. Weir Insurance Agency, Inc. [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	May 1, 2015
McDowall Associates Human Resources Consultants Ltd. [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	May 1, 2015
Vital Benefits, Inc. [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	May 1, 2015
Monument, LLC (ML) [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Jun. 1, 2015
Solid Benefit Guidance Limited Liability Company (SBG) [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Jun. 1, 2015
ARM Re Ltda Corredores de Reaseguros [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Jul. 1, 2015
National Administration Company, Inc. (NAC) [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Aug. 1, 2015
William Gallagher Associates Insurance Brokers, Inc. (WGA) [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Aug. 1, 2015
North Alabama Insurance, Inc. [Member]
Business Acquisition [Line Items]
Effective Date of Acquisition	Sep. 1, 2015
Nine Other Acquisitions [Member]
Business Acquisition [Line Items]
Effective Year of Acquisition	2,015

Business Combinations - Additio

Business Combinations - Additional Information (Detail) $ in Millions	3 Months Ended		9 Months Ended		165 Months Ended
	Sep. 30, 2015USD ($)Entity	Sep. 30, 2014USD ($)Entity	Sep. 30, 2015USD ($)EntityEmployees	Sep. 30, 2014USD ($)Entity	Sep. 30, 2015USD ($)Entity
Business Acquisition [Line Items]
Accretion of the discount on acquisition	$ 3.7	$ 3.9	$ 12.2	$ 10.6
Income related to net adjustments to estimated fair value of liability for earnout obligations	$ 6	$ 0.6	$ 13.7	$ 6
Number of companies acquired | Entity	35	17	72	49	368
Aggregate amount of maximum earnout obligations related to acquisitions			$ 580.8
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet			223.6
Goodwill	$ 245.8		245.8		$ 245.8
Expiration lists	233.3		233.3		233.3
Non-compete agreements	2		2		2
Total revenues related to acquisitions in the aggregate	1,461.7	$ 1,332.5	4,133.3	$ 3,518.2
Brokerage and Risk Management [Member]
Business Acquisition [Line Items]
Goodwill	245.8		245.8		245.8
Expiration lists	233.3		233.3		233.3
Non-compete agreements	2		$ 2		2
Expiration lists, amortization period, minimum, years			3 years
Expiration lists, amortization period, maximum, years			15 years
Non-compete agreements, amortization period, minimum, years			3 years
Non-compete agreements, amortization period, maximum, years			5 years
Trade names, amortization period, minimum ,years			5 years
Trade names, amortization period, maximum, years			15 years
Write-off of amortizable intangible assets		$ 0.6	$ 0.5	$ 1.2
Maximum [Member]
Business Acquisition [Line Items]
Revenue growth rate			12.00%
2015 Acquisitions [Member] | Market Approach Valuation Technique [Member] | Minimum [Member]
Business Acquisition [Line Items]
Revenue growth rate			4.00%
Discount rate			8.00%
2015 Acquisitions [Member] | Market Approach Valuation Technique [Member] | Maximum [Member]
Business Acquisition [Line Items]
Discount rate			8.50%
2015 Acquisitions [Member] | Income Approach Valuation Technique [Member] | Maximum [Member]
Business Acquisition [Line Items]
Revenue growth rate			5.00%
Discount rate			13.00%
Attrition rate			13.00%
2014 Acquisitions [Member] | Income Approach Valuation Technique [Member] | Minimum [Member]
Business Acquisition [Line Items]
Revenue growth rate			2.00%
Discount rate			11.00%
Attrition rate			3.00%
Business Acquisition [Member]
Business Acquisition [Line Items]
Annualized revenue of business acquisitions			$ 184.5
Total revenues related to acquisitions in the aggregate			67.4
Net earnings			5.1
Business Acquisition [Member] | Brokerage [Member]
Business Acquisition [Line Items]
Expiration lists	233.3		233.3		233.3
Non-compete agreements	2		2		2
Deferred tax liability	7.2		7.2		7.2
Goodwill related to nondeductible amortizable intangible assets			7.2
Business Acquisition [Member] | Expiration Lists [Member] | Brokerage [Member]
Business Acquisition [Line Items]
Business acquisition not deductible for income tax purposes	23.2		23.2		23.2
Business Acquisition [Member] | Non-Compete Agreements [Member] | Brokerage [Member]
Business Acquisition [Line Items]
Business acquisition not deductible for income tax purposes	0.6		0.6		0.6
William Gallagher Associates Insurance Brokers, Inc. (WGA) [Member]
Business Acquisition [Line Items]
Cash and common stock paid for acquisition			151.5
Annualized revenue of business acquisitions			$ 50
Number of employees at office of acquired entity | Employees			200
Goodwill	86.8		$ 86.8		86.8
Expiration lists	62.7		62.7		62.7
Non-compete agreements	$ 0.3		$ 0.3		$ 0.3

Business Combinations - Summary

Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail) $ in Millions	Sep. 30, 2015USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Cash	$ 3.8
Other current assets	103.4
Fixed assets	7.4
Noncurrent assets	0.7
Goodwill	245.8
Expiration lists	233.3
Non-compete agreements	2
Total assets acquired	596.4
Current liabilities	91.5
Noncurrent liabilities	10.9
Total liabilities assumed	102.4
Total net assets acquired	494
Cohn Financial Group, LLC (CFG) [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Cash	0.1
Goodwill	13.6
Expiration lists	9.6
Non-compete agreements	0.1
Total assets acquired	23.4
Total net assets acquired	23.4
Burns-Fazzi, Brock & Associates, LLC (BFB) [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Cash	0.1
Other current assets	0.3
Goodwill	18.5
Expiration lists	23
Non-compete agreements	0.1
Total assets acquired	42
Current liabilities	0.2
Total liabilities assumed	0.2
Total net assets acquired	41.8
Madison Risk & Insurance Services, Inc. (MRI) [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Cash	0.1
Other current assets	0.6
Goodwill	6.3
Expiration lists	9.9
Non-compete agreements	0.1
Total assets acquired	17
Current liabilities	0.6
Total liabilities assumed	0.6
Total net assets acquired	16.4
Integrated Healthcare Strategies, LLC (IHS) [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Other current assets	8.3
Fixed assets	1.1
Goodwill	24.8
Expiration lists	24.8
Non-compete agreements	0.1
Total assets acquired	59.1
Current liabilities	3.4
Total liabilities assumed	3.4
Total net assets acquired	55.7
Monument, LLC (ML) [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Other current assets	0.2
Goodwill	5.7
Expiration lists	13
Total assets acquired	18.9
Total net assets acquired	18.9
Solid Benefit Guidance Limited Liability Company (SBG) [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Other current assets	1.4
Goodwill	30.9
Expiration lists	27.7
Non-compete agreements	0.1
Total assets acquired	60.1
Current liabilities	0.7
Total liabilities assumed	0.7
Total net assets acquired	59.4
National Administration Company, Inc. (NAC) [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Cash	0.3
Fixed assets	0.2
Goodwill	6.9
Expiration lists	16.5
Non-compete agreements	0.1
Total assets acquired	24
Total net assets acquired	24
William Gallagher Associates Insurance Brokers, Inc. (WGA) [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Other current assets	63.4
Fixed assets	0.6
Noncurrent assets	0.1
Goodwill	86.8
Expiration lists	62.7
Non-compete agreements	0.3
Total assets acquired	213.9
Current liabilities	62.4
Total liabilities assumed	62.4
Total net assets acquired	151.5
Twenty-One Other Acquisitions [Member]
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Cash	3.2
Other current assets	29.2
Fixed assets	5.5
Noncurrent assets	0.6
Goodwill	52.3
Expiration lists	46.1
Non-compete agreements	1.1
Total assets acquired	138
Current liabilities	24.2
Noncurrent liabilities	10.9
Total liabilities assumed	35.1
Total net assets acquired	$ 102.9

Business Combinations - Summa43

Business Combinations - Summary of Unaudited Pro Forma Historical Results (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Business Combinations [Abstract]
Total revenues	$ 1,461.7	$ 1,332.5	$ 4,133.3	$ 3,518.2
Net earnings attributable to controlling interests	$ 134.2	$ 96	$ 301.7	$ 260.6
Basic net earnings per share	$ 0.76	$ 0.58	$ 1.73	$ 1.67
Diluted net earnings per share	$ 0.76	$ 0.57	$ 1.72	$ 1.66

Other Current Assets - Summary

Other Current Assets - Summary of Major Classes of Other Current Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Premium finance advances and loans	$ 217	$ 232.6
Accrued supplemental, direct bill and other receivables	167.6	156.3
Refined coal production related receivables	135	103.5
Deferred income taxes - current	109.4	102.2
Prepaid expenses	71	72.1
Total other current assets	$ 700	$ 666.7

Other Current Assets - Addition

Other Current Assets - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2015
Schedule Of Other Current Assets [Line Items]
Collateralized delinquency period of receivables	7 days
Crombie Lockwood Oamps [Member]
Schedule Of Other Current Assets [Line Items]
Acquisition agreement date	Jun. 16, 2014

Intangible Assets - Carrying Am

Intangible Assets - Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Goodwill [Line Items]
Total goodwill - net	$ 3,579.6	$ 3,449.6
Unites States [Member]
Goodwill [Line Items]
Total goodwill - net	1,908.7	1,672.8
United Kingdom [Member]
Goodwill [Line Items]
Total goodwill - net	806.9	820.6
Canada [Member]
Goodwill [Line Items]
Total goodwill - net	293.3	318.5
Australia [Member]
Goodwill [Line Items]
Total goodwill - net	342.9	336.8
Other Foreign, Principally New Zealand [Member]
Goodwill [Line Items]
Total goodwill - net	227.8	300.9
Brokerage [Member]
Goodwill [Line Items]
Total goodwill - net	3,552.2	3,427.5
Brokerage [Member] | Unites States [Member]
Goodwill [Line Items]
Total goodwill - net	1,885.2	1,652.6
Brokerage [Member] | United Kingdom [Member]
Goodwill [Line Items]
Total goodwill - net	803.3	818.7
Brokerage [Member] | Canada [Member]
Goodwill [Line Items]
Total goodwill - net	293.3	318.5
Brokerage [Member] | Australia [Member]
Goodwill [Line Items]
Total goodwill - net	342.9	336.8
Brokerage [Member] | Other Foreign, Principally New Zealand [Member]
Goodwill [Line Items]
Total goodwill - net	227.5	300.9
Risk Management [Member]
Goodwill [Line Items]
Total goodwill - net	27.4	22.1
Risk Management [Member] | Unites States [Member]
Goodwill [Line Items]
Total goodwill - net	23.5	20.2
Risk Management [Member] | United Kingdom [Member]
Goodwill [Line Items]
Total goodwill - net	3.6	1.9
Risk Management [Member] | Canada [Member]
Goodwill [Line Items]
Total goodwill - net	0
Risk Management [Member] | Australia [Member]
Goodwill [Line Items]
Total goodwill - net	0
Risk Management [Member] | Other Foreign, Principally New Zealand [Member]
Goodwill [Line Items]
Total goodwill - net	0.3
Corporate [Member]
Goodwill [Line Items]
Total goodwill - net	0	$ 0
Corporate [Member] | Unites States [Member]
Goodwill [Line Items]
Total goodwill - net	0
Corporate [Member] | United Kingdom [Member]
Goodwill [Line Items]
Total goodwill - net	0
Corporate [Member] | Canada [Member]
Goodwill [Line Items]
Total goodwill - net	0
Corporate [Member] | Australia [Member]
Goodwill [Line Items]
Total goodwill - net	0
Corporate [Member] | Other Foreign, Principally New Zealand [Member]
Goodwill [Line Items]
Total goodwill - net	$ 0

Intangible Assets - Changes in

Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2015USD ($)
Goodwill [Line Items]
Beginning Balance	$ 3,449.6
Goodwill acquired during the period	245.8
Goodwill related to transfer of operations between segments	0
Goodwill adjustments due to appraisals and other acquisition adjustments	34.8
Foreign currency translation adjustments during the period	(150.6)
Ending Balance	3,579.6
Brokerage [Member]
Goodwill [Line Items]
Beginning Balance	3,427.5
Goodwill acquired during the period	243.8
Goodwill related to transfer of operations between segments	(3.4)
Goodwill adjustments due to appraisals and other acquisition adjustments	34.8
Foreign currency translation adjustments during the period	(150.5)
Ending Balance	3,552.2
Risk Management [Member]
Goodwill [Line Items]
Beginning Balance	22.1
Goodwill acquired during the period	2
Goodwill related to transfer of operations between segments	3.4
Goodwill adjustments due to appraisals and other acquisition adjustments	0
Foreign currency translation adjustments during the period	(0.1)
Ending Balance	27.4
Corporate [Member]
Goodwill [Line Items]
Beginning Balance	0
Goodwill acquired during the period	0
Goodwill related to transfer of operations between segments	0
Goodwill adjustments due to appraisals and other acquisition adjustments	0
Foreign currency translation adjustments during the period	0
Ending Balance	$ 0

Intangible Assets - Major Class

Intangible Assets - Major Classes of Amortizable Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, net	$ 1,741.8	$ 1,776
Expiration Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	2,590.7	2,461.9
Accumulated amortization	(870.4)	(719.3)
Amortizable intangible assets, net	1,720.3	1,742.6
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	42.2	43.2
Accumulated amortization	(33.4)	(29.5)
Amortizable intangible assets, net	8.8	13.7
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	26.1	29.7
Accumulated amortization	(13.4)	(10)
Amortizable intangible assets, net	$ 12.7	$ 19.7

Intangible Assets - Estimated A

Intangible Assets - Estimated Aggregate Amortization Expense (Detail) $ in Millions	Sep. 30, 2015USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2015 (remaining three months)	$ 58.4
2,016	228.7
2,017	218.3
2,018	204.3
2,019	190.8
Total	$ 900.5

Credit and Other Debt Agreeme50

Credit and Other Debt Agreements - Summary of Corporate and Other Debt (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Semi-annual payments of interest	$ 2,392.6	$ 2,392.9
Premium Financing Debt Facility [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	114.6	127.9
Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	2,125	2,125
Fixed Rate of 6.44%, Balloon Due 2017 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	300	300
Fixed Rate of 5.85%, $50.0 Million Due in 2016, 2018 and 2019 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	150	150
Fixed Rate of 2.80%, Balloon Due 2018 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	50	50
Fixed Rate of 3.20%, Balloon Due 2019 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	50	50
Fixed Rate of 3.99%, Balloon Due 2020 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	50	50
Fixed Rate of 3.48%, Balloon Due 2020 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	50	50
Fixed Rate of 5.18%, Balloon Due 2021 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	75	75
Fixed rate of 3.69%, Balloon Due 2022 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	200	200
Fixed Rate of 5.49%, Balloon Due 2023 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	50	50
Fixed Rate of 4.13%, Balloon Due 2023 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	200	200
Fixed Rate of 4.58% Balloon Due 2024 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	325	325
Fixed Rate of 4.31%, Balloon Due 2025 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	200	200
Fixed Rate of 4.73% Balloon Due 2026 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	175	175
Fixed Rate of 4.36%, Balloon Due 2026 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	150	150
Fixed Rate of 4.98% Balloon Due 2029 [Member] | Note Purchase Agreements [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	100	100
Prime or LIBOR plus up to 1.45%, expires September 19, 2018 [Member] | Multi Currency Credit Agreement [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	153	140
Interbank rates plus 1.05%, Expires May 18, 2017 [Member] | AUD denominated tranche [Member] | Facility B [Member] | Premium Financing Debt Facility [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	91.8	95
Interbank rates plus 1.05%, Expires May 18, 2017 [Member] | NZD denominated tranche [Member] | Facility B [Member] | Premium Financing Debt Facility [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	7.9	17.8
Interbank rates plus 0.55%, Expires May 18, 2017 [Member] | AUD denominated tranche [Member] | Facility C and D [Member] | Premium Financing Debt Facility [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	5.4	7.7
Interbank rates plus 0.55%, Expires May 18, 2017 [Member] | NZD denominated tranche [Member] | Facility C and D [Member] | Premium Financing Debt Facility [Member]
Debt Instrument [Line Items]
Semi-annual payments of interest	$ 9.5	$ 7.4

Credit and Other Debt Agreeme51

Credit and Other Debt Agreements - Summary of Corporate and Other Debt (Parenthetical) (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Premium Financing Debt Facility [Member]
Debt Instrument [Line Items]
Periodic payments of interest and principal, expiry date	May 18, 2017	May 18, 2017
Fixed Rate of 6.44%, Balloon Due 2017 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	6.44%	6.44%
Principal payments, year due	2,017	2,017
Fixed Rate of 5.85%, $50.0 Million Due in 2016, 2018 and 2019 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	5.85%	5.85%
Long-Term debt maturities repayments in 2016	$ 50	$ 50
Long-Term debt maturities repayments in 2018	50	50
Long-Term debt maturities repayments in 2019	$ 50	$ 50
Fixed Rate of 2.80%, Balloon Due 2018 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	2.80%	2.80%
Principal payments, year due	2,018	2,018
Fixed Rate of 3.20%, Balloon Due 2019 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	3.20%	3.20%
Principal payments, year due	2,019	2,019
Fixed Rate of 3.99%, Balloon Due 2020 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	3.99%	3.99%
Principal payments, year due	2,020	2,020
Fixed Rate of 3.48%, Balloon Due 2020 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	3.48%	3.48%
Principal payments, year due	2,020	2,020
Fixed Rate of 5.18%, Balloon Due 2021 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	5.18%	5.18%
Principal payments, year due	2,021	2,021
Fixed rate of 3.69%, Balloon Due 2022 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	3.69%	3.69%
Principal payments, year due	2,022	2,022
Fixed Rate of 5.49%, Balloon Due 2023 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	5.49%	5.49%
Principal payments, year due	2,023	2,023
Fixed Rate of 4.13%, Balloon Due 2023 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	4.13%	4.13%
Principal payments, year due	2,023	2,023
Fixed Rate of 4.58% Balloon Due 2024 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	4.58%	4.58%
Principal payments, year due	2,024	2,024
Fixed Rate of 4.31%, Balloon Due 2025 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	4.31%	4.31%
Principal payments, year due	2,025	2,025
Fixed Rate of 4.73% Balloon Due 2026 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	4.73%	4.73%
Principal payments, year due	2,026	2,026
Fixed Rate of 4.36%, Balloon Due 2026 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	4.36%	4.36%
Principal payments, year due	2,026	2,026
Fixed Rate of 4.98% Balloon Due 2029 [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	4.98%	4.98%
Principal payments, year due	2,029	2,029
Prime or LIBOR plus up to 1.45%, expires September 19, 2018 [Member] | Credit Agreement [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	1.45%	1.45%
Periodic payments of interest and principal, expiry date	Sep. 19, 2018	Sep. 19, 2018
First Installment [Member] | Fixed Rate of 5.85%, $50.0 Million Due in 2016, 2018 and 2019 [Member]
Debt Instrument [Line Items]
Principal payments, year due	2,016	2,016
Second Installment [Member] | Fixed Rate of 5.85%, $50.0 Million Due in 2016, 2018 and 2019 [Member]
Debt Instrument [Line Items]
Principal payments, year due	2,018	2,018
Third Installment [Member] | Fixed Rate of 5.85%, $50.0 Million Due in 2016, 2018 and 2019 [Member]
Debt Instrument [Line Items]
Principal payments, year due	2,019	2,019
Facility B [Member] | Interbank rates plus 1.05%, Expires May 18, 2017 [Member] | Premium Financing Debt Facility [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	1.05%	1.05%
Facility C and D [Member] | Interbank rates plus 0.55%, Expires May 18, 2017 [Member] | Premium Financing Debt Facility [Member]
Debt Instrument [Line Items]
Periodic Payment of Interest	0.55%	0.55%

Credit and Other Debt Agreeme52

Credit and Other Debt Agreements - Note Purchase Agreements - Additional information (Detail) - Note Purchase Agreements [Member] $ in Millions	9 Months Ended
	Sep. 30, 2015USD ($)
Debt Instrument [Line Items]
Amount payable to redeem the notes, percent of the principal amount	100.00%
Discount rate used to compute the remaining scheduled payments of principal and interest	U.S. Treasury yields plus 0.5%
6.44% Senior Notes, Series B [Member]
Debt Instrument [Line Items]
Notes issued and sold	$ 300
Note payable, semi-annual payments of interest, fixed rate	6.44%
Debt instrument, maturity date	Aug. 3, 2017
5.85% Senior Notes, Series C [Member]
Debt Instrument [Line Items]
Notes issued and sold	$ 150
Note payable, semi-annual payments of interest, fixed rate	5.85%
5.85% Senior Notes, Series C [Member] | First Installment [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Nov. 30, 2016
5.85% Senior Notes, Series C [Member] | Second Installment [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Nov. 30, 2018
5.85% Senior Notes, Series C [Member] | Third Installment [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Nov. 30, 2019
5.18% Senior Notes, Series D [Member]
Debt Instrument [Line Items]
Notes issued and sold	$ 75
Note payable, semi-annual payments of interest, fixed rate	5.18%
Debt instrument, maturity date	Feb. 10, 2021
5.49% Senior Notes, Series E [Member]
Debt Instrument [Line Items]
Notes issued and sold	$ 50
Note payable, semi-annual payments of interest, fixed rate	5.49%
Debt instrument, maturity date	Feb. 10, 2023
3.99% Senior Notes, Series F [Member]
Debt Instrument [Line Items]
Notes issued and sold	$ 50
Note payable, semi-annual payments of interest, fixed rate	3.99%
Debt instrument, maturity date	Jul. 10, 2020
3.69% Senior Notes Series G [Member] | Private Placement [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Jun. 14, 2022
Private placement debt, additional amount committed to borrow	$ 200
Interest rate	3.69%
4.58% Senior Notes, Series H [Member]
Debt Instrument [Line Items]
Notes issued and sold	$ 325
Note payable, semi-annual payments of interest, fixed rate	4.58%
Debt instrument, maturity date	Feb. 27, 2024
4.73% Senior Notes, Series I [Member]
Debt Instrument [Line Items]
Notes issued and sold	$ 175
Note payable, semi-annual payments of interest, fixed rate	4.73%
Debt instrument, maturity date	Feb. 27, 2026
4.98% Senior Notes, Series J [Member]
Debt Instrument [Line Items]
Notes issued and sold	$ 100
Note payable, semi-annual payments of interest, fixed rate	4.98%
Debt instrument, maturity date	Feb. 27, 2029
Senior Notes Series H, I & J [Member]
Debt Instrument [Line Items]
Debt acquisition costs	$ 1.4
2.80% Senior Notes, Series K [Member]
Debt Instrument [Line Items]
Notes issued and sold	$ 50
Note payable, semi-annual payments of interest, fixed rate	2.80%
Debt instrument, maturity date	Jun. 24, 2018
3.20% Senior Notes, Series L [Member]
Debt Instrument [Line Items]
Notes issued and sold	$ 50
Note payable, semi-annual payments of interest, fixed rate	3.20%
Debt instrument, maturity date	Jun. 24, 2019
3.48% Senior Notes, Series M [Member]
Debt Instrument [Line Items]
Notes issued and sold	$ 50
Note payable, semi-annual payments of interest, fixed rate	3.48%
Debt instrument, maturity date	Jun. 24, 2020
4.13% Senior Notes, Series N [Member]
Debt Instrument [Line Items]
Notes issued and sold	$ 200
Note payable, semi-annual payments of interest, fixed rate	4.13%
Debt instrument, maturity date	Jun. 24, 2023
4.31% Senior Notes, Series O [Member]
Debt Instrument [Line Items]
Notes issued and sold	$ 200
Note payable, semi-annual payments of interest, fixed rate	4.31%
Debt instrument, maturity date	Jun. 24, 2025
4.36% Senior Notes, Series P [Member]
Debt Instrument [Line Items]
Notes issued and sold	$ 150
Note payable, semi-annual payments of interest, fixed rate	4.36%
Debt instrument, maturity date	Jun. 24, 2026
Senior Notes Series K, L, M, N, O & P [Member]
Debt Instrument [Line Items]
Debt acquisition costs	$ 2.6

Credit and Other Debt Agreeme53

Credit and Other Debt Agreements - Credit Agreement - Additional information (Detail) NZD in Millions, AUD in Millions	9 Months Ended
	Sep. 30, 2015USD ($)Institution	Sep. 30, 2015AUDInstitution	Sep. 30, 2015NZDInstitution	Sep. 30, 2014USD ($)	Sep. 30, 2015AUD	Sep. 30, 2015NZD	Dec. 31, 2014USD ($)
Debt Instrument [Line Items]
Liabilities	$ 6,802,500,000						$ 6,704,900,000
Line of credit facility, increase in additional borrowings	534,000,000			$ 1,017,400,000
Net borrowings on premium financing debt facility	$ 4,400,000			$ 36,300,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Date of expire	May 18, 2017	May 18, 2017	May 18, 2017
Interest rate for facility	The interest rates on Facility B are Interbank rates, which vary by tranche, duration and currency, plus a margin of 1.05%. The interest rates on Facilities C and D are 30 day Interbank rates, plus a margin of 0.55%. The annual fee for Facility B is 0.4725% of the undrawn commitments for the two tranches of the facility. The annual fee for Facilities C and D is 0.50% of the total commitments of the facilities.	The interest rates on Facility B are Interbank rates, which vary by tranche, duration and currency, plus a margin of 1.05%. The interest rates on Facilities C and D are 30 day Interbank rates, plus a margin of 0.55%. The annual fee for Facility B is 0.4725% of the undrawn commitments for the two tranches of the facility. The annual fee for Facilities C and D is 0.50% of the total commitments of the facilities.	The interest rates on Facility B are Interbank rates, which vary by tranche, duration and currency, plus a margin of 1.05%. The interest rates on Facilities C and D are 30 day Interbank rates, plus a margin of 0.55%. The annual fee for Facility B is 0.4725% of the undrawn commitments for the two tranches of the facility. The annual fee for Facilities C and D is 0.50% of the total commitments of the facilities.
Debt instrument fair value amount	$ 114,600,000
Multi Currency Credit Agreement [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 600,000,000
Number of financial institutions entered in unsecured multicurrency credit agreement | Institution	15	15	15
Debt instrument, maturity date	Sep. 19, 2018	Sep. 19, 2018	Sep. 19, 2018
Line of credit facility, maximum amount outstanding during period	$ 850,000,000
Fixed rate (alternative one) over LIBOR	0.85%	0.85%	0.85%
Fixed rate (alternative two) over LIBOR	0.95%	0.95%	0.95%
Fixed rate (alternative three) over LIBOR	1.05%	1.05%	1.05%
Fixed rate (alternative four) over LIBOR	1.25%	1.25%	1.25%
Fixed rate (alternative five) over LIBOR	1.45%	1.45%	1.45%
Annual facility fee of revolving credit facility (alternative one)	0.15%	0.15%	0.15%
Annual facility fee of revolving credit facility (alternative two)	0.175%	0.175%	0.175%
Annual facility fee of revolving credit facility (alternative three)	0.20%	0.20%	0.20%
Annual facility fee of revolving credit facility (alternative four)	0.25%	0.25%	0.25%
Annual facility fee of revolving credit facility (alternative five)	0.30%	0.30%	0.30%
Debt acquisition costs	$ 2,100,000
Estimated fair value of outstanding borrowings	153,000,000
Multi Currency Credit Agreement [Member] | Swing Loan [Member]
Debt Instrument [Line Items]
Long-term debt, gross	50,000,000
Multi Currency Credit Agreement [Member] | Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Long-term debt, gross	75,000,000
Line of credit facility, amount outstanding	23,100,000
Liabilities	11,200,000
Line of credit facility, fair value of amount outstanding	153,000,000
Line of credit facility, remaining borrowing capacity	423,900,000
Line of credit facility, increase in additional borrowings	$ 51,900,000
Credit Facility Two [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, amount outstanding					AUD 130	NZD 12.5
Line of credit facility, remaining borrowing capacity					20	22.5
Net borrowings on premium financing debt facility		AUD 150	NZD 35
Additional margin percentage on interest rate	1.05%	1.05%	1.05%
Annual fee percentage	0.4725%	0.4725%	0.4725%
Credit Facility Three [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, amount outstanding | AUD					7.7
Line of credit facility, remaining borrowing capacity					17.3	0
Net borrowings on premium financing debt facility | AUD		AUD 25
Additional margin percentage on interest rate	0.55%	0.55%	0.55%
Annual fee percentage	0.50%	0.50%	0.50%
Credit Facility Four [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, amount outstanding | NZD						15
Line of credit facility, remaining borrowing capacity					AUD 17.3	NZD 0
Net borrowings on premium financing debt facility | NZD			NZD 15
Additional margin percentage on interest rate	0.55%	0.55%	0.55%
Annual fee percentage	0.50%	0.50%	0.50%
Note Purchase Agreements [Member] | Level 3 [Member]
Debt Instrument [Line Items]
Line of credit facility, fair value of amount outstanding	$ 2,261,200,000
Long-term debt	$ 2,125,000,000

Earnings Per Share - Computatio

Earnings Per Share - Computation of Basic and Diluted Net EPS (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net earnings attributable to controlling interests	$ 133.3	$ 93.6	$ 294.5	$ 251.9
Weighted average number of common shares outstanding	176	160.2	170.7	149.6
Dilutive effect of stock options using the treasury stock method	0.8	1.3	1.1	1.4
Weighted average number of common and common equivalent shares outstanding	176.8	161.5	171.8	151
Basic net earnings per share	$ 0.76	$ 0.58	$ 1.73	$ 1.68
Diluted net earnings per share	$ 0.75	$ 0.58	$ 1.71	$ 1.67

Earnings Per Share - Additional

Earnings Per Share - Additional information (Detail) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Options to purchase common stock shares outstanding	3.9	1.9	3.4	1.4

Stock Option Plans - Additional

Stock Option Plans - Additional information (Detail) - USD ($)	Mar. 11, 2015	Mar. 12, 2014	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2015	Sep. 30, 2014
Stock Option Plans [Line Items]
Maximum number of shares available				362,600		323,600
Maximum number of shares granted during any fiscal year to any person							200,000
Number of years options expire, maximum							7 years	7 years
Compensation expense related to stock option grants			$ 3,100,000		$ 2,700,000		$ 8,200,000	$ 6,700,000
Total intrinsic value of options exercised							26,300,000	$ 26,600,000
Total unrecognized compensation cost related to nonvested options			$ 38,000,000				$ 38,000,000
Weighted average period, years							4 years
Officer and Key Employees [Member]
Stock Option Plans [Line Items]
Shares available for grant	1,941,000	1,923,000
Stock options granted, exercise percentage, on the anniversary date of the grant in 2018	34.00%	34.00%
Stock options granted, exercise percentage, on the anniversary date of the grant in 2019	33.00%	33.00%
Stock options granted, exercise percentage, on the anniversary date of the grant in 2020	33.00%	33.00%
Long Term Incentive Plan [Member]
Stock Option Plans [Line Items]
Maximum number of shares available							1,500,000
Shares available for grant			7,100,000				7,100,000
Performance-Based Restricted Stock [Member]
Stock Option Plans [Line Items]
Maximum number of shares granted during any fiscal year to any person							100,000
Cash Settled Performance Shares [Member] | Performance-Based Restricted Stock [Member]
Stock Option Plans [Line Items]
Maximum amount payable for the shares granted during any fiscal year to any person							$ 5,000,000
Stock Settled Performance Shares [Member] | Performance-Based Restricted Stock [Member]
Stock Option Plans [Line Items]
Maximum number of shares granted during any fiscal year to any person							100,000
Maximum [Member]
Stock Option Plans [Line Items]
Maximum period for the exercise of stock options, years							7 years
Minimum [Member]
Stock Option Plans [Line Items]
Minimum exercise price of stock options, percent of fair market value of a share of common stock on the date of grant							100.00%
Period of Service from Grant Date Stock Options Awarded Not Subject to Forfeiture							2 years
Minimum [Member] | Executive Officer [Member]
Stock Option Plans [Line Items]
Minimum age of employee with not subject to award forfeiture on condition compliance							55 years
Black-Scholes Option Pricing Model [Member]
Stock Option Plans [Line Items]
Weighted average fair value per option for all options							$ 9.25	$ 9.66

Stock Option Plans - Black-Scho

Stock Option Plans - Black-Scholes Option Pricing Model with Weighted Average (Detail)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Expected dividend yield	3.00%	3.00%
Expected risk-free interest rate	1.80%	1.80%
Volatility	28.20%	28.90%
Expected life (in years)	5 years 6 months	5 years 6 months

Stock Option Plans - Stock Opti

Stock Option Plans - Stock Option Activity and Related Information (Detail) $ / shares in Units, shares in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2015USD ($)$ / sharesshares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares Under Option, Beginning balance | shares	8.4
Shares Under Option, Granted | shares	1.9
Shares Under Option, Exercised | shares	(1.4)
Shares Under Option, Forfeited or canceled | shares	0
Shares Under Option, Ending balance | shares	8.9
Shares Under Option, Exercisable at end of period | shares	2.2
Shares Under Option, Ending vested and expected to vest | shares	8.7
Weighted Average Exercise Price, Beginning balance	$ 35.49
Weighted Average Exercise Price, Granted	46.19
Weighted Average Exercise Price, Exercised	27.57
Weighted Average Exercise Price, Forfeited or canceled	0
Weighted Average Exercised Price, Ending balance	39.16
Weighted Average Exercise Price, Exercisable at end of period	28.52
Weighted Average Exercise price, Ending vested and expected to vest	$ 39.05
Weighted Average Remaining Contractual Term (in years), Ending balance	4 years 4 months 21 days
Weighted Average Remaining Contractual Term (in years), Exercisable at end of period	2 years 2 months 1 day
Weighted Average Remaining Contractual Term (in years), Ending vested and expected to vest	4 years 4 months 10 days
Aggregate Intrinsic Value, Ending Balance | $	$ 39.3
Aggregate Intrinsic Value, Exercisable at end of period | $	27.5
Aggregate Intrinsic Value, Ending vested and expected to vest | $	$ 39.2

Stock Option Plans - Stock Op59

Stock Option Plans - Stock Options Outstanding and Exercisable (Detail) - $ / shares shares in Millions	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 21.28
Range of Exercise Prices, maximum	$ 47.92
Option Outstanding, Number Outstanding	8.9
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 4 months 21 days
Option Outstanding, Weighted Average Exercise Price	$ 39.16	$ 35.49
Options Exercisable, Number Exercisable	2.2
Option Exercisable, Weighted Average Exercise Price	$ 28.52
Exercise Prices Range $ 21.28 - $ 35.71 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	21.28
Range of Exercise Prices, maximum	$ 35.71
Option Outstanding, Number Outstanding	3.3
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	2 years 6 months 11 days
Option Outstanding, Weighted Average Exercise Price	$ 30.51
Options Exercisable, Number Exercisable	2.2
Option Exercisable, Weighted Average Exercise Price	$ 28.51
Exercise Prices Range $ 35.95 - $ 46.17 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	35.95
Range of Exercise Prices, maximum	$ 46.17
Option Outstanding, Number Outstanding	3.6
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	5 years 6 months 7 days
Option Outstanding, Weighted Average Exercise Price	$ 42.93
Option Exercisable, Weighted Average Exercise Price	35.95
Exercise Prices Range $ 46.87 - $ 46.87 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	46.87
Range of Exercise Prices, maximum	$ 46.87
Option Outstanding, Number Outstanding	1.9
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	5 years 5 months 12 days
Option Outstanding, Weighted Average Exercise Price	$ 46.87
Exercise Prices Range $ 47.92 - $ 47.92 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	47.92
Range of Exercise Prices, maximum	$ 47.92
Option Outstanding, Number Outstanding	0.1
Option Outstanding, Weighted Average Remaining Contractual Term (in years)	6 years 6 months 29 days
Option Outstanding, Weighted Average Exercise Price	$ 47.92

Deferred Compensation - Additio

Deferred Compensation - Additional information (Detail) - USD ($) shares in Millions	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Investments And Employee Deferred Compensation Plan [Line Items]
Deferred Equity Participation Plan, distributions to key executives, age					Age 62 (or the one-year anniversary of the date of the grant for participants over the age of 61 as of the grant date) or upon or after their actual retirement
Age 62 Plan [Member]
Investments And Employee Deferred Compensation Plan [Line Items]
Awards approved by committee, value		$ 8,900,000		$ 9,200,000
Charge to compensation expenses related to awards	$ 2,100,000		$ 2,400,000		$ 5,200,000	$ 5,600,000
Unearned deferred compensation, value					$ 35,700,000		$ 28,200,000
Unearned deferred compensation, shares					2.1		1.9
Total intrinsic value of unvested equity based awards					$ 86,900,000		$ 89,100,000
Cash and equity awards with aggregate fair value vested and distributed to participants					800,000
Deferred Cash Participation Plan (DCPP) [Member]
Investments And Employee Deferred Compensation Plan [Line Items]
Awards approved by committee, value		$ 2,700,000		$ 2,900,000
Charge to compensation expenses related to awards	$ 300,000		$ 700,000		900,000	$ 2,200,000
Cash and equity awards with aggregate fair value vested and distributed to participants					$ 0

Restricted Stock, Performance61

Restricted Stock, Performance Share and Cash Awards - Additional Information (Detail)	Mar. 11, 2015USD ($)shares	Mar. 12, 2014USD ($)shares	Sep. 30, 2015USD ($)shares	Mar. 31, 2015USD ($)shares	Sep. 30, 2014USD ($)shares	Mar. 31, 2014USD ($)shares	Sep. 30, 2015USD ($)Timesshares	Sep. 30, 2014USD ($)	Dec. 31, 2014shares	Mar. 31, 2013shares	Mar. 13, 2013USD ($)shares	Mar. 16, 2012USD ($)shares
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Share-based compensation, shares outstanding | shares			8,900,000				8,900,000		8,400,000
Shares granted in the period | shares				362,600		323,600
Fair value of grants in period				$ 16,700,000		$ 15,200,000
Ultimate award value, multiples of original value of the units, minimum | Times							0.5
Ultimate award value, multiples of original value of the units, maximum | Times							1.5
Minimum [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Period of Service from Grant Date Stock Options Awarded Not Subject to Forfeiture							2 years
Officer and Key Employees [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Stock options granted, exercise percentage, on the anniversary date of the grant in 2015	34.00%	34.00%
Stock options granted, exercise percentage, on the anniversary date of the grant in 2016	33.00%	33.00%
Stock options granted, exercise percentage, on the anniversary date of the grant in 2017	33.00%	33.00%
Executive Officer [Member] | Minimum [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Minimum age of employee with not subject to award forfeiture on condition compliance							55 years
Performance Shares [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Shares authorized | shares	53,900	48,800
Performance unit awards approved, Fair value	$ 2,500,000	$ 2,300,000
Performance unit awards, Terms							Granted units for the 2015 and 2014 provisional awards will fully vest based on continuous employment through January 1, 2018 and January 1, 2017, respectively, and will be settled in shares of our common stock on a one-for-one basis as soon as practicable in 2018 and 2017, respectively.
Performance period, years							1 year
Vesting period, years							2 years
Restricted Stock Units (RSUs) [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Share-based compensation, shares outstanding, Value			$ 2,000,000				$ 2,000,000
Share-based compensation, shares outstanding | shares			1,500,000				1,500,000
Share based payment award vesting date				Mar. 11, 2019		Mar. 12, 2018
Restricted stock or unit expense			$ 3,200,000		$ 3,100,000		$ 10,700,000	$ 9,600,000
Restricted Stock Units (RSUs) [Member] | Minimum [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Period of Service from Grant Date Stock Options Awarded Not Subject to Forfeiture				2 years		2 years
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member] | Minimum [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Minimum age of employee with not subject to award forfeiture on condition compliance				55 years		55 years
Unvested Restricted Stock [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Total intrinsic value			57,300,000		55,000,000		57,300,000	55,000,000
Equity awards with an aggregate fair value							$ 10,200,000	9,700,000
Cash Awards [Member] | Officer and Key Employees [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Performance period, years							1 year
Vesting period, years							2 years
Provisional compensation cash awards approved for future grant by compensation committee, value	$ 14,600,000	$ 10,800,000									$ 10,500,000	$ 13,100,000
Provisional compensation cash award approved for future grant by compensation committee, units | shares	315,000	229,000		220,000		263,000				365,000	269,000	368,000
2015 Provisional Cash Awards [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Cash-based compensation awards, expenses							$ 0
2014 Provisional Cash Awards [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Cash-based compensation awards, expenses			1,200,000				3,700,000	0
2013 Provisional Cash Awards [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Cash-based compensation awards, expenses			$ 1,300,000		1,500,000		$ 4,300,000	4,500,000
2012 Provisional Cash Awards [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Provisional compensation cash award approved for future grant by compensation committee, units | shares			300,000				300,000
Cash-based compensation awards, expenses					$ 1,800,000		$ 0	$ 6,300,000
Grants vested in period fair value			$ 15,800,000				$ 15,800,000
Restricted Stock Plan [Member]
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]
Shares granted in the period | shares				362,600	33,741	323,600
Fair value of grants in period					$ 1,500,000
Stock options granted, exercise percentage, on the anniversary date of the grant in 2015					34.00%
Stock options granted, exercise percentage, on the anniversary date of the grant in 2016					33.00%
Stock options granted, exercise percentage, on the anniversary date of the grant in 2017					33.00%

Retirement Plans - Components o

Retirement Plans - Components of Net Periodic Pension Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]
Service cost	$ 0.3	$ 0.1	$ 0.8	$ 0.3
Interest cost on benefit obligation	2.7	3.2	8.1	9.6
Expected return on plan assets	(3.8)	(4.7)	(11.5)	(14.1)
Amortization of net actuarial loss	1.5	0.6	4.7	1.8
Net periodic benefit cost (earnings)	$ 0.7	$ (0.8)	$ 2.1	$ (2.4)

Retirement Plans - Additional I

Retirement Plans - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]
Minimum contribution by employer	$ 0	$ 0

Investments - Investments Repor

Investments - Investments Reported in Other Current and Non-Current Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Assets	$ 81.5	$ 82
Funding Commitments	8.6
Chem-Mod LLC [Member]
Schedule of Equity Method Investments [Line Items]
Assets	4	4
Chem-Mod International LLC [Member]
Schedule of Equity Method Investments [Line Items]
Assets	2	2
Clean-Coal Investments [Member] | Controlling Interest [Member] | Fourteen 2009 Era Clean Coal Plants [Member]
Schedule of Equity Method Investments [Line Items]
Assets	14.8	17.3
Clean-Coal Investments [Member] | Controlling Interest [Member] | Nineteen 2011 Era Clean Coal Plants [Member]
Schedule of Equity Method Investments [Line Items]
Assets	57.2	54.5
Funding Commitments	5.7
Clean-Coal Investments [Member] | Noncontrolling Interests [Member] | One 2011 Era Clean Coal Plant [Member]
Schedule of Equity Method Investments [Line Items]
Assets	0.9	1
Other Investments [Member]
Schedule of Equity Method Investments [Line Items]
Assets	2.6	$ 3.2
Funding Commitments	$ 2.9

Investments - Investments Rep65

Investments - Investments Reported in Other Current and Non-Current Assets (Parenthetical) (Detail) - Clean-Coal Investments [Member]	9 Months Ended	12 Months Ended
	Sep. 30, 2015EntityPlant	Dec. 31, 2014EntityPlant
Schedule of Equity Method Investments [Line Items]
Number of variable interest entities	1
Fourteen 2009 Era Clean Coal Plants [Member] | Controlling Interest [Member]
Schedule of Equity Method Investments [Line Items]
Number of coal plants | Plant	14	14
Number of variable interest entities	5	5
One 2011 Era Clean Coal Plant [Member] | Noncontrolling Interests [Member]
Schedule of Equity Method Investments [Line Items]
Number of coal plants | Plant	1	1
Number of variable interest entities	1	1
Nineteen 2011 Era Clean Coal Plants [Member] | Controlling Interest [Member]
Schedule of Equity Method Investments [Line Items]
Number of coal plants | Plant	19	19
Number of variable interest entities	15	15

Investments - Additional Inform

Investments - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Mar. 31, 2014	Aug. 01, 2013
Chem-Mod International LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest held	31.52%
C-Quest Technologies LLC and C-Quest Technologies International LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest held	12.00%
Increase in ownership interest	4.00%
Option to acquire additional interest, percent	19.00%
Option to acquire additional interest, total price	$ 9.5
End date for acquiring additional interest	Aug. 1, 2016
Loans to majority owners			$ 2
Interest rate of loan			2.00%
Maturity date of loan	May 15, 2014
Loan description	On August 1, 2013, we loaned the majority owner $2.0 million at a 2% interest rate, which was to mature on May 15, 2014. Also on August 1, 2013, the option to acquire the 19% interests was extended to August 15, 2016. The loan was to be repaid in cash or by delivery of an additional 4% ownership interest in C-Quest's global entities. On March 31, 2014, we accepted payment of the loan by delivery of the additional 4% ownership interest, therefore our remaining option was reduced to 15% and the remaining purchase price was reduced to $7.5 million.
Delivery of additional ownership interest		4.00%
C-Quest Technologies LLC and C-Quest Technologies International LLC [Member] | Change in Option on Delivery of Additional Interest [Member]
Schedule of Equity Method Investments [Line Items]
Option to acquire additional interest, percent	15.00%
Option to acquire additional interest, total price	$ 7.5
Chem-Mod Clean-Coal Venture - U.S. and Canadian Operations [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest held	46.54%
Chem-Mod Clean-Coal Venture [Member]
Schedule of Equity Method Investments [Line Items]
Total assets of variable interest entities	$ 11.3
Total liabilities of variable interest entities	1.1
Total revenues of limited liability companies	55.2
Total expenses of limited liability companies	$ 2.2

Investments - Clean Coal Invest

Investments - Clean Coal Investments - Additional Information (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015USD ($)Entity	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)EntityPlant	Sep. 30, 2014USD ($)	Mar. 01, 2014USD ($)Plant	Mar. 01, 2013Plant
Schedule of Equity Method Investments [Line Items]
Total revenues	$ 1,454.8	$ 1,286.8	$ 4,057.5	$ 3,381.1
Number of clean coal production plants seeking and negotiating for long term production contract | Plant			5
Limited Liability Company [Member]
Schedule of Equity Method Investments [Line Items]
Carrying value of prior non-controlling interest in limited liability company on acquisition date					$ 15.6
Ownership interest acquired in a limited liability company	50.00%		50.00%
2009 Era Plants [Member]
Schedule of Equity Method Investments [Line Items]
Number of additional plants acquired | Plant					7	12
Number of additional plants acquired with ownership interest range one | Plant						9
Number of additional plants acquired with ownership interest range two | Plant						3
Ownership interest before additional nine plants acquired						24.50%
Ownership interest after additional nine plants acquired						49.50%
Ownership interest before additional three plants acquired						25.00%
Ownership interest after additional three plants acquired						60.00%
Purchase of consideration received	$ 8		$ 8
Payment of cash and other consideration	5		5
Gain on purchase of additional interest	$ 11.4		$ 11.4
Prior percentage of equity interest in limited liability company	25.00%		25.00%
Additional percentage of equity interest in limited liability company upon acquisition	35.00%		35.00%
Fixed assets and other amortizable intangible assets acquired upon acquisition	$ 26.3		$ 26.3
Carrying value of prior non-controlling interest in limited liability company on acquisition date	4.8		4.8
Other assets acquired upon acquisition	6.8		$ 6.8
Ownership interest before additional seven plants acquired					49.50%
Ownership interest after additional seven plants acquired					100.00%
2011 Era Plants [Member]
Schedule of Equity Method Investments [Line Items]
Number of additional plants acquired | Plant					5
Gain on purchase of additional interest					$ 25.6
Fixed assets and other amortizable intangible assets acquired upon acquisition					$ 26.3
Ownership interest before additional one plant acquired					48.80%
Ownership interest after additional one plant acquired					90.00%
Ownership interest before additional three plants acquired					49.00%
Ownership interest after additional three plants acquired					100.00%
Ownership interest before additional one plant acquired					98.00%
Ownership interest after additional one plant acquired					100.00%
Total revenues	141.7
Total expenses	$ 150.3
Chem-Mod LLC [Member]
Schedule of Equity Method Investments [Line Items]
Number of clean coal production plants owned | Plant			34
Chem-Mod LLC [Member] | 2009 Era Plants [Member]
Schedule of Equity Method Investments [Line Items]
Number of clean coal production plants owned | Plant			14
Chem-Mod LLC [Member] | 2011 Era Plants [Member]
Schedule of Equity Method Investments [Line Items]
Number of clean coal production plants owned | Plant			20
Long Term Production Contracts [Member]
Schedule of Equity Method Investments [Line Items]
Number of clean coal production plants owned | Plant			29
Clean-Coal Investments [Member]
Schedule of Equity Method Investments [Line Items]
Number of variable interest entities | Entity	1		1
Clean-Coal Investments [Member] | VIE [Member]
Schedule of Equity Method Investments [Line Items]
Total assets of limited liability companies	$ 9.1		$ 9.1
Total liability of limited liability companies	$ 6.4		6.4
Total revenues of limited liability companies			30.1
Total expenses of limited liability companies			$ 36.9

Investments - Other Investments

Investments - Other Investments - Additional Information (Detail) $ in Millions	Sep. 30, 2015USD ($)InvestmentVenture	Dec. 31, 2014USD ($)
Schedule of Equity Method Investments [Line Items]
Assets	$ 81.5	$ 82
Non controlling interest certified low-income housing developments | Investment	12
Non controlling interest in real estate entities | Investment	2
Carrying value of investments in real estate entities	$ 0
Other Investments [Member]
Schedule of Equity Method Investments [Line Items]
Assets	2.6	$ 3.2
Other Investments [Member] | Four Venture Capital Funds [Member]
Schedule of Equity Method Investments [Line Items]
Assets	$ 2.1
Non controlling interest in venture capital funds number | Venture	4
Other Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Assets	$ 60
Debt	20
Other Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Twelve Certified Low-Income Housing Developments [Member]
Schedule of Equity Method Investments [Line Items]
Carrying value of investments	$ 0
Investment Management Company [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest held	20.00%
Cost of acquiring equity interest	$ 0.5

Commitments, Contingencies an69

Commitments, Contingencies and Off-Balance Sheet Arrangements - Contractual Obligations (Detail) $ in Millions	Sep. 30, 2015USD ($)
Note Purchase Agreements [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2016	$ 50
Contractual Obligations, Payments Due by Period, 2017	300
Contractual Obligations, Payments Due by Period, 2018	100
Contractual Obligations, Payments Due by Period, 2019	100
Contractual Obligations, Payments Due by Period, Thereafter	1,575
Contractual Obligations, Payments Due by Period, Total	2,125
Multi Currency Credit Agreement [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2015	153
Contractual Obligations, Payments Due by Period, Total	153
Premium Financing Debt Facility [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2015	114.6
Contractual Obligations, Payments Due by Period, Total	114.6
Interest On Debt [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2015	22.4
Contractual Obligations, Payments Due by Period, 2016	100.4
Contractual Obligations, Payments Due by Period, 2017	97.5
Contractual Obligations, Payments Due by Period, 2018	77.5
Contractual Obligations, Payments Due by Period, 2019	73.2
Contractual Obligations, Payments Due by Period, Thereafter	323.9
Contractual Obligations, Payments Due by Period, Total	694.9
Total Debt Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2015	290
Contractual Obligations, Payments Due by Period, 2016	150.4
Contractual Obligations, Payments Due by Period, 2017	397.5
Contractual Obligations, Payments Due by Period, 2018	177.5
Contractual Obligations, Payments Due by Period, 2019	173.2
Contractual Obligations, Payments Due by Period, Thereafter	1,898.9
Contractual Obligations, Payments Due by Period, Total	3,087.5
Operating Lease Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2015	26.2
Contractual Obligations, Payments Due by Period, 2016	95.6
Contractual Obligations, Payments Due by Period, 2017	85.5
Contractual Obligations, Payments Due by Period, 2018	66.4
Contractual Obligations, Payments Due by Period, 2019	53.7
Contractual Obligations, Payments Due by Period, Thereafter	176.1
Contractual Obligations, Payments Due by Period, Total	503.5
Less Sublease Arrangements [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2015	(1.2)
Contractual Obligations, Payments Due by Period, 2016	(0.7)
Contractual Obligations, Payments Due by Period, 2017	(0.3)
Contractual Obligations, Payments Due by Period, 2018	(0.1)
Contractual Obligations, Payments Due by Period, Thereafter	(0.1)
Contractual Obligations, Payments Due by Period, Total	(2.4)
Outstanding Purchase Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2015	20.2
Contractual Obligations, Payments Due by Period, 2016	15.5
Contractual Obligations, Payments Due by Period, 2017	9.6
Contractual Obligations, Payments Due by Period, 2018	6.8
Contractual Obligations, Payments Due by Period, 2019	6.5
Contractual Obligations, Payments Due by Period, Thereafter	6.2
Contractual Obligations, Payments Due by Period, Total	64.8
Total Contractual Obligations [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Contractual Obligations, Payments Due by Period, 2015	335.2
Contractual Obligations, Payments Due by Period, 2016	260.8
Contractual Obligations, Payments Due by Period, 2017	492.3
Contractual Obligations, Payments Due by Period, 2018	250.6
Contractual Obligations, Payments Due by Period, 2019	233.4
Contractual Obligations, Payments Due by Period, Thereafter	2,081.1
Contractual Obligations, Payments Due by Period, Total	$ 3,653.4

Commitments, Contingencies an70

Commitments, Contingencies and Off-Balance Sheet Arrangements - Additional Information (Detail) £ in Millions	Aug. 26, 2015USD ($)	Aug. 26, 2015GBP (£)	Sep. 30, 2015USD ($)ft²Entity	Sep. 30, 2014Entity	Sep. 30, 2015USD ($)ft²EntityEmployeesLetterOfCreditCompanies	Sep. 30, 2014Entity	Sep. 30, 2015USD ($)ft²Entity
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Acquired property through lease area, sqft | ft²					306,000
Acquired property through lease percentage of building					60.00%
Operating lease commitment, expiration date					Feb. 28, 2018
Number of square feet | ft²			315,000		315,000		315,000
Number of employees will accommodate at new facility | Employees					1,750
Number of companies acquired | Entity			35	17	72	49	368
Aggregate amount of maximum earnout obligations related to acquisitions					$ 580,800,000
Aggregate amount of maximum earnout obligations related to acquisitions, recorded in consolidated balance sheet					223,600,000
Litigation payments	$ 31,000,000	£ 20
Amount received from former executives	$ 3,100,000	£ 2
Pretax gain related to litigation settlement			$ 31,000,000		31,000,000
Income tax credits and adjustments					109,000,000
Funding Commitments [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Funding commitments related to acquisitions			$ 32,000,000		32,000,000		$ 32,000,000
Expenditures related to our new business locations					58,500,000
Number of companies acquired | Entity			2
Tax-Advantaged Investments No Longer Held [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Total indemnifications			$ 32,000,000		32,000,000		32,000,000
Errors and Omissions [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Insurance claims, amount retained					5,000,000
Amount of losses in excess of retained amounts			175,000,000		$ 175,000,000		175,000,000
Self-Insurance Deductibles [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Number of letters of credit issued | LetterOfCredit					2
Rent-A-Captive Facility [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Number of letters of credit issued | LetterOfCredit					7
Letter of Credit [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Debt			5,000,000		$ 5,000,000		5,000,000
Number of letters of credit issued | LetterOfCredit					1
Letter of Credit [Member] | Security Deposit [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Debt			500,000		$ 500,000		500,000
Number of letters of credit issued | LetterOfCredit					1
Letter of Credit [Member] | Self-Insurance Deductibles [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Liabilities recorded on self-insurance			11,300,000		$ 11,300,000		11,300,000
Debt			11,200,000		11,200,000		11,200,000
Letter of Credit [Member] | Rent-A-Captive Facility [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Debt			$ 6,300,000		$ 6,300,000		$ 6,300,000
Tax Increment Financing [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Property tax credit expect to receive period					15 years
Minimum [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Ownership interest			1.00%		1.00%		1.00%
Number of micro-captive insurance companies organized or managed | Companies					100
Minimum [Member] | Errors and Omissions [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Actuarial range value			$ 1,700,000		$ 1,700,000		$ 1,700,000
Minimum [Member] | Tax Increment Financing [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Property tax credit expect to receive			$ 60,000,000		$ 60,000,000		$ 60,000,000
Maximum [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Ownership interest			50.00%		50.00%		50.00%
Maximum [Member] | Errors and Omissions [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Actuarial range value			$ 6,200,000		$ 6,200,000		$ 6,200,000
Maximum [Member] | Tax Increment Financing [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Property tax credit expect to receive			$ 80,000,000		$ 80,000,000		$ 80,000,000
United Kingdom [Member] | Brokerage [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Number of senior employees resigned | Employees					5

Commitments, Contingencies an71

Commitments, Contingencies and Off-Balance Sheet Arrangements - Off-Balance Sheet Commitments (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2015USD ($)
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Amount of Commitment Expiration by Period - 2015	$ 52.4
Amount of Commitment Expiration by Period - 2016	42.5
Amount of Commitment Expiration by Period - 2017	3.4
Amount of Commitment Expiration by Period - 2018	0.7
Amount of Commitment Expiration by Period - 2019	2.3
Amount of Commitment Expiration by Period - Thereafter	39.4
Total Amounts Committed	140.7
Letters of Credit [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Amount of Commitment Expiration by Period - Thereafter	23.1
Total Amounts Committed	23.1
Financial Guarantees [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Amount of Commitment Expiration by Period - 2015	0.7
Amount of Commitment Expiration by Period - 2016	0.7
Amount of Commitment Expiration by Period - 2017	0.7
Amount of Commitment Expiration by Period - 2018	0.7
Amount of Commitment Expiration by Period - 2019	0.8
Amount of Commitment Expiration by Period - Thereafter	14.9
Total Amounts Committed	18.5
Funding Commitments [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Amount of Commitment Expiration by Period - 2015	51.7
Amount of Commitment Expiration by Period - 2016	41.8
Amount of Commitment Expiration by Period - 2017	2.7
Amount of Commitment Expiration by Period - 2019	1.5
Amount of Commitment Expiration by Period - Thereafter	1.4
Total Amounts Committed	$ 99.1

Accumulated Other Comprehensi72

Accumulated Other Comprehensive Earnings (Loss) - Schedule of Accumulated Other Comprehensive Earnings (Loss) Attributable to Controlling Interests (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2015USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (260.6)
Ending Balance	(496.3)
Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(44.2)
Net change in period	1.3
Ending Balance	(42.9)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(216.3)
Net change in period	(237.9)
Ending Balance	(454.2)
Fair Value of Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(0.1)
Net change in period	0.9
Ending Balance	0.8
Accumulated Other Comprehensive Earnings (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(260.6)
Net change in period	(235.7)
Ending Balance	$ (496.3)

Accumulated Other Comprehensi73

Accumulated Other Comprehensive Earnings (Loss) - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Expense related to pension liability reclassified from accumulated other comprehensive earnings (loss)	$ 4,700,000	$ 1,800,000
Expense related to fair value of derivative investments reclassified from accumulated other comprehensive earnings (loss)	100,000	500,000
Foreign currency translation reclassified from accumulated other comprehensive earnings (loss)	$ 0	$ 0

Segment Information - Additiona

Segment Information - Additional Information (Detail) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2015USD ($)	Sep. 30, 2015USD ($)Segment
Segment Reporting [Abstract]
Number of reportable operating segments		3
Pretax gain related to litigation settlement | $	$ 31	$ 31

Segment Information - Schedule

Segment Information - Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total revenues	$ 1,454.8	$ 1,286.8	$ 4,057.5	$ 3,381.1
Identifiable assets at September 30, 2015 and 2014	10,510.4		10,510.4		$ 10,010
Brokerage [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	835.5	795.2	2,472.2	2,097.5
Earnings (loss) before income taxes	122.5	123.8	340.1	310.3
Identifiable assets at September 30, 2015 and 2014	8,638.2	8,377.1	8,638.2	8,377.1
Risk Management [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	179.2	172.9	545.8	509.9
Earnings (loss) before income taxes	22.4	21	72.7	60.9
Identifiable assets at September 30, 2015 and 2014	640.4	621	640.4	621
Corporate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	440.1	318.7	1,039.5	773.7
Earnings (loss) before income taxes	(39.2)	(49.4)	(147.7)	(109.2)
Identifiable assets at September 30, 2015 and 2014	$ 1,231.8	$ 989.9	$ 1,231.8	$ 989.9