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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenues before reimbursements $ 1,741.2 $ 1,559.9 [1] $ 5,169.1 $ 4,627.5 [1]
Total revenues 1,778.5 1,593.7 [1] 5,276.6 4,729.6 [1]
Compensation 765.7 680.5 [1] 2,266.2 2,059.2 [1]
Operating 227.7 209.0 [1] 666.6 612.7 [1]
Reimbursements 37.3 33.8 [1] 107.5 102.1 [1]
Interest 36.7 31.4 [1] 101.9 92.9 [1]
Depreciation 33.4 30.5 [1] 94.8 90.2 [1]
Amortization 72.8 69.6 [1] 214.4 199.0 [1]
Change in estimated acquisition earnout payables 5.8 10.6 [1] 7.2 27.5 [1]
Total expenses 1,688.2 1,516.8 [1] 4,840.4 4,399.0 [1]
Earnings before income taxes 90.3 76.9 [1] 436.2 330.6 [1]
Benefit for income taxes (48.1) (41.2) [1] (111.9) (107.8) [1]
Net earnings 138.4 118.1 [1] 548.1 438.4 [1]
Net earnings attributable to noncontrolling interests 10.8 7.1 [1] 31.9 28.6 [1]
Net earnings attributable to controlling interests $ 127.6 $ 111.0 [1] $ 516.2 $ 409.8 [1]
Basic net earnings per share $ 0.70 $ 0.61 [1] $ 2.83 $ 2.28 [1]
Diluted net earnings per share 0.68 0.61 [1] 2.78 2.26 [1]
Dividends declared per common share $ 0.41 $ 0.39 [1] $ 1.23 $ 1.17 [1]
Commissions [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues $ 707.6 $ 637.9 [1] $ 2,235.0 $ 2,016.8 [1]
Broker Fees [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues 452.7 416.2 [1] 1,323.0 1,208.1 [1]
Supplemental Revenue Member [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues 43.9 36.9 [1] 144.0 120.0 [1]
Contingent Revenue [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues 25.7 21.8 [1] 82.4 78.1 [1]
Investment income [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues 18.0 15.9 [1] 47.2 42.6 [1]
Gains on Books of Business Sales [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues 0.6 0.6 [1] 9.6 3.1 [1]
Clean Coal Activities [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues 492.4 430.6 [1] 1,327.0 1,158.8 [1]
Cost of revenues from clean coal activities 508.8 451.4 [1] 1,381.8 1,215.4 [1]
Reimbursements [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues $ 37.3 33.8 [1] $ 107.5 102.1 [1]
As Previously Reported [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenues before reimbursements   1,584.5   4,560.6
Total revenues   1,584.5   4,560.6
Compensation   680.1   2,013.4
Operating   214.2   626.2
Interest   31.4   92.9
Depreciation   30.5   90.2
Amortization   69.6   199.0
Change in estimated acquisition earnout payables   10.6   27.5
Total expenses   1,487.8   4,264.6
Earnings before income taxes   96.7   296.0
Benefit for income taxes   (41.1)   (90.0)
Net earnings   137.8   386.0
Net earnings attributable to noncontrolling interests   7.4   28.0
Net earnings attributable to controlling interests   $ 130.4   $ 358.0
Basic net earnings per share   $ 0.72   $ 1.99
Diluted net earnings per share   0.71   1.97
Dividends declared per common share   $ 0.39   $ 1.17
As Previously Reported [Member] | Commissions [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   $ 662.6   $ 1,943.3
As Previously Reported [Member] | Broker Fees [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   422.4   1,203.8
As Previously Reported [Member] | Supplemental Revenue Member [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   39.9   115.9
As Previously Reported [Member] | Contingent Revenue [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   13.5   96.4
As Previously Reported [Member] | Investment income [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   14.9   39.3
As Previously Reported [Member] | Gains on Books of Business Sales [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   0.6   3.1
As Previously Reported [Member] | Clean Coal Activities [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   430.6   1,158.8
Cost of revenues from clean coal activities   451.4   1,215.4
Impact of Adoption of Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Revenues before reimbursements   (24.6)   66.9
Total revenues   9.2   169.0
Compensation   0.4   45.8
Operating   (5.2)   (13.5)
Reimbursements   33.8   102.1
Total expenses   29.0   134.4
Earnings before income taxes   (19.8)   34.6
Benefit for income taxes   (0.1)   (17.8)
Net earnings   (19.7)   52.4
Net earnings attributable to noncontrolling interests   (0.3)   0.6
Net earnings attributable to controlling interests   $ (19.4)   $ 51.8
Basic net earnings per share   $ (0.11)   $ 0.29
Diluted net earnings per share   $ (0.10)   $ 0.29
Impact of Adoption of Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Commissions [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   $ (24.7)   $ 73.5
Impact of Adoption of Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Broker Fees [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   (6.2)   4.3
Impact of Adoption of Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Supplemental Revenue Member [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   (3.0)   4.1
Impact of Adoption of Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Contingent Revenue [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   8.3   (18.3)
Impact of Adoption of Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Investment income [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   1.0   3.3
Impact of Adoption of Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Reimbursements [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Total revenues   $ 33.8   $ 102.1
[1] See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to Topic 606.