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Revenue from Contracts with Customers - Summary of Consolidated Statement of Earnings Line Items, which Reflect Adoption of New Revenue Recognition Guidance (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Commissions $ 839.4 $ 760.7 [1]
Fees 448.1 405.0 [1]
Supplemental revenues 52.0 47.3 [1]
Contingent revenues 34.9 35.0 [1]
Investment income 13.4 12.3 [1]
Gains on books of business sales 2.9 1.4 [1]
Revenues from clean coal activities 412.2 351.8 [1]
Other net losses [1]   (0.2)
Revenues before reimbursements 1,802.9 1,613.3 [1]
Reimbursements 34.8 33.1 [1]
Total revenues   1,646.4
Compensation 775.8 711.8 [1]
Operating 216.1 199.5 [1]
Reimbursements 34.8 33.1 [1]
Cost of revenues from clean coal activities 431.2 366.9 [1]
Interest 31.3 29.9 [1]
Depreciation 30.6 29.5 [1]
Amortization 68.2 64.3 [1]
Change in estimated acquisition earnout payables 7.4 11.8 [1]
Total expenses 1,595.4 1,446.8 [1]
Earnings before income taxes 242.3 199.6 [1]
Benefit for income taxes (43.7) (42.4) [1]
Net earnings 286.0 242.0 [1]
Net earnings attributable to noncontrolling interests 12.3 13.2 [1]
Net earnings attributable to controlling interests $ 273.7 $ 228.8 [1]
Basic net earnings per share $ 1.51 $ 1.28 [1]
Diluted net earnings per share 1.48 1.27 [1]
Dividends declared per common share $ 0.41 $ 0.39 [1]
As Previously Reported [Member]    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Commissions   $ 590.5
Fees   370.5
Supplemental revenues   34.5
Contingent revenues   53.4
Investment income   10.8
Gains on books of business sales   1.4
Revenues from clean coal activities   351.8
Other net losses   (0.2)
Revenues before reimbursements   1,412.7
Total revenues   1,412.7
Compensation   657.6
Operating   200.4
Cost of revenues from clean coal activities   366.9
Interest   29.9
Depreciation   29.5
Amortization   64.3
Change in estimated acquisition earnout payables   11.8
Total expenses   1,360.4
Earnings before income taxes   52.3
Benefit for income taxes   (15.5)
Net earnings   67.8
Net earnings attributable to noncontrolling interests   12.1
Net earnings attributable to controlling interests   $ 55.7
Basic net earnings per share   $ 0.31
Diluted net earnings per share   0.31
Dividends declared per common share   $ 0.39
Impact of Adoption of ASC 606 [Member] | Accounting Standards Update 2014-09 [Member]    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Commissions   $ 170.2
Fees   34.5
Supplemental revenues   12.8
Contingent revenues   (18.4)
Investment income   1.5
Revenues before reimbursements   200.6
Reimbursements   33.1
Total revenues   233.7
Compensation   54.2
Operating   (0.9)
Reimbursements   33.1
Total expenses   86.4
Earnings before income taxes   147.3
Benefit for income taxes   (26.9)
Net earnings   174.2
Net earnings attributable to noncontrolling interests   1.1
Net earnings attributable to controlling interests   $ 173.1
Basic net earnings per share   $ 0.97
Diluted net earnings per share   $ 0.96
[1] See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to ASC 606.