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Consolidated Statement of Earnings - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues before reimbursements                 $ 6,792.4 $ 6,113.0 [1] $ 5,548.4 [1]
Total revenues                 6,934.0 6,249.0 [1] 5,680.5 [1]
Compensation                 3,026.3 2,747.4 [1] 2,537.2 [1]
Operating                 903.7 829.1 [1] 776.3 [1]
Reimbursements                 141.6 136.0 [1] 132.1 [1]
Cost of revenues from clean coal activities                 1,816.0 1,635.9 1,408.6
Interest                 138.4 124.1 [1] 109.8 [1]
Depreciation                 127.8 121.1 [1] 103.6 [1]
Amortization                 291.2 264.7 [1] 247.2 [1]
Change in estimated acquisition earnout payables                 9.6 30.9 [1] 32.1 [1]
Total expenses                 6,454.6 5,889.2 [1] 5,346.9 [1]
Earnings before income taxes                 479.4 359.8 [1] 333.6 [1]
Benefit for income taxes                 (196.5) (157.1) [1] (96.7) [1]
Net earnings                 675.9 516.9 [1] 430.3 [1]
Net earnings attributable to noncontrolling interests                 42.4 35.6 [1] 33.5 [1]
Net earnings attributable to controlling interests $ 117.3 $ 127.6 $ 114.9 $ 273.7 $ 71.5 $ 111.0 $ 70.0 $ 228.8 $ 633.5 $ 481.3 [1] $ 396.8 [1]
Basic net earnings per share                 $ 3.47 $ 2.67 [1] $ 2.23 [1]
Diluted net earnings per share                 3.40 2.64 [1] 2.22 [1]
Dividends declared per common share                 $ 1.64 $ 1.56 [1] $ 1.52 [1]
Commissions [Member]                      
Total revenues                 $ 2,920.7 $ 2,641.0 [1] $ 2,409.9 [1]
Broker Fees [Member]                      
Total revenues                 1,756.3 1,591.9 [1] 1,491.7 [1]
Supplemental Revenue Member [Member]                      
Total revenues                 189.9 158.0 [1] 139.9 [1]
Contingent Revenue [Member]                      
Total revenues                 98.0 99.5 [1] 97.9 [1]
Investment income [Member]                      
Total revenues                 70.1 58.7 [1] 53.6 [1]
Gains on Books of Business Sales [Member]                      
Total revenues                 10.2 3.4 [1] 6.6 [1]
Clean Coal Activities [Member]                      
Total revenues                 1,746.3 1,560.5 [1] 1,350.1 [1]
Cost of revenues from clean coal activities                 1,816.0 1,635.9 [1] 1,408.6 [1]
Product and Service, Other [Member]                      
Total revenues                 0.9   (1.3) [1]
Reimbursements [Member]                      
Total revenues                 $ 141.6 $ 136.0 [1] $ 132.1 [1]
[1] See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to Topic 606.