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Segment Information - Schedule of Segment Reporting Information by Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]          
Total revenues $ 1,584.0 $ 1,657.8 $ 3,450.9 $ 3,648.4  
Earnings before income taxes 171.7 105.5 527.7 427.3  
Identifiable assets at June 30, 2020 and 2019 21,306.2 19,200.3 21,306.2 19,200.3 $ 19,634.8
Operating Segments [Member] | Brokerage [Member]          
Segment Reporting Information [Line Items]          
Total revenues 1,201.1 1,131.2 2,636.7 2,513.1  
Earnings before income taxes 247.8 182.3 658.6 594.7  
Identifiable assets at June 30, 2020 and 2019 18,405.6 16,464.3 18,405.6 16,464.3  
Operating Segments [Member] | Risk Management [Member]          
Segment Reporting Information [Line Items]          
Total revenues 223.2 242.1 472.7 478.5  
Earnings before income taxes 13.2 21.0 38.8 43.0  
Identifiable assets at June 30, 2020 and 2019 929.1 847.9 929.1 847.9  
Operating Segments [Member] | Corporate [Member]          
Segment Reporting Information [Line Items]          
Total revenues 159.7 284.5 341.5 656.8  
Earnings before income taxes (89.3) (97.8) (169.7) (210.4)  
Identifiable assets at June 30, 2020 and 2019 $ 1,971.5 $ 1,888.1 $ 1,971.5 $ 1,888.1