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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenues before reimbursements $ 1,625.0 $ 1,454.3 [1] $ 3,427.9 $ 3,067.6 [1]
Total revenues 1,660.4 1,489.5 [1] 3,498.1 3,135.9 [1]
Compensation 724.7 666.9 [1] 1,500.5 1,378.7 [1]
Operating 222.8 204.2 [1] 438.9 403.7 [1]
Reimbursements 35.4 35.2 [1] 70.2 68.3 [1]
Interest 33.9 31.6 [1] 65.2 61.5 [1]
Depreciation 30.8 30.2 [1] 61.4 59.7 [1]
Amortization 73.4 65.1 [1] 141.6 129.4 [1]
Change in estimated acquisition earnout payables (6.0) 5.1 [1] 1.4 16.9 [1]
Total expenses 1,556.8 1,435.4 [1] 3,152.2 2,882.2 [1]
Earnings before income taxes 103.6 54.1 [1] 345.9 253.7 [1]
Benefit for income taxes (20.1) (24.2) [1] (63.8) (66.6) [1]
Net earnings 123.7 78.3 [1] 409.7 320.3 [1]
Net earnings attributable to noncontrolling interests 8.8 8.3 [1] 21.1 21.5 [1]
Net earnings attributable to controlling interests $ 114.9 $ 70.0 [1] $ 388.6 $ 298.8 [1]
Basic net earnings per share $ 0.63 $ 0.39 [1] $ 2.14 $ 1.67 [1]
Diluted net earnings per share 0.62 0.39 [1] 2.10 1.65 [1]
Dividends declared per common share $ 0.41 $ 0.39 [1] $ 0.82 $ 0.78 [1]
Commissions [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues $ 688.0 $ 618.2 [1] $ 1,527.4 $ 1,378.9 [1]
Broker Fees [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues 422.2 386.9 [1] 870.3 791.9 [1]
Supplemental Revenue Member [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues 48.1 35.8 [1] 100.1 83.1 [1]
Contingent Revenue [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues 21.8 21.3 [1] 56.7 56.3 [1]
Investment income [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues 15.8 14.4 [1] 29.2 26.7 [1]
Gains on Books of Business Sales [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues 6.1 1.1 [1] 9.0 2.5 [1]
Clean Coal Activities [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues 422.4 376.4 [1] 834.6 728.2 [1]
Cost of revenues from clean coal activities 441.8 397.1 [1] 873.0 764.0 [1]
Product and Service, Other [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues 0.6 0.2 [1] 0.6  
Reimbursements [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues $ 35.4 35.2 [1] $ 70.2 68.3 [1]
As Previously Reported [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenues before reimbursements   1,563.4   2,976.1
Total revenues   1,563.4   2,976.1
Compensation   675.7   1,333.3
Operating   211.6   412.0
Interest   31.6   61.5
Depreciation   30.2   59.7
Amortization   65.1   129.4
Change in estimated acquisition earnout payables   5.1   16.9
Total expenses   1,416.4   2,776.8
Earnings before income taxes   147.0   199.3
Benefit for income taxes   (33.4)   (48.9)
Net earnings   180.4   248.2
Net earnings attributable to noncontrolling interests   8.5   20.6
Net earnings attributable to controlling interests   $ 171.9   $ 227.6
Basic net earnings per share   $ 0.96   $ 1.27
Diluted net earnings per share   0.95   1.26
Dividends declared per common share   $ 0.39   $ 0.78
As Previously Reported [Member] | Commissions [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   $ 690.2   $ 1,280.7
As Previously Reported [Member] | Broker Fees [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   410.9   781.4
As Previously Reported [Member] | Supplemental Revenue Member [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   41.5   76.0
As Previously Reported [Member] | Contingent Revenue [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   29.5   82.9
As Previously Reported [Member] | Investment income [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   13.6   24.4
As Previously Reported [Member] | Gains on Books of Business Sales [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   1.1   2.5
As Previously Reported [Member] | Clean Coal Activities [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   376.4   728.2
Cost of revenues from clean coal activities   397.1   764.0
As Previously Reported [Member] | Product and Service, Other [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   0.2    
Impact of Adoption of ASC 606 [Member] | Accounting Standards Update 2014-09 [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenues before reimbursements   (109.1)   91.5
Total revenues   (73.9)   159.8
Compensation   (8.8)   45.4
Operating   (7.4)   (8.3)
Reimbursements   35.2   68.3
Total expenses   19.0   105.4
Earnings before income taxes   (92.9)   54.4
Benefit for income taxes   9.2   (17.7)
Net earnings   (102.1)   72.1
Net earnings attributable to noncontrolling interests   (0.2)   0.9
Net earnings attributable to controlling interests   $ (101.9)   $ 71.2
Basic net earnings per share   $ (0.57)   $ 0.40
Diluted net earnings per share   $ (0.56)   $ 0.39
Impact of Adoption of ASC 606 [Member] | Accounting Standards Update 2014-09 [Member] | Commissions [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   $ (72.0)   $ 98.2
Impact of Adoption of ASC 606 [Member] | Accounting Standards Update 2014-09 [Member] | Broker Fees [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   (24.0)   10.5
Impact of Adoption of ASC 606 [Member] | Accounting Standards Update 2014-09 [Member] | Supplemental Revenue Member [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   (5.7)   7.1
Impact of Adoption of ASC 606 [Member] | Accounting Standards Update 2014-09 [Member] | Contingent Revenue [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   (8.2)   (26.6)
Impact of Adoption of ASC 606 [Member] | Accounting Standards Update 2014-09 [Member] | Investment income [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   0.8   2.3
Impact of Adoption of ASC 606 [Member] | Accounting Standards Update 2014-09 [Member] | Reimbursements [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   $ 35.2   $ 68.3
[1] See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to ASC 606.