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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]          
Total revenues $ 1,933.5 $ 1,584.0 $ 4,098.5 $ 3,450.9  
Earnings before income taxes 222.3 171.7 630.7 527.7  
Identifiable assets at June 30, 2021 and 2020 27,817.2 21,306.2 27,817.2 21,306.2 $ 22,331.4
Operating Segments [Member] | Brokerage [Member]          
Segment Reporting Information [Line Items]          
Total revenues 1,390.2 1,201.1 3,000.4 2,636.7  
Earnings before income taxes 299.7 247.8 780.0 658.6  
Identifiable assets at June 30, 2021 and 2020 21,858.6 18,405.6 21,858.6 18,405.6  
Operating Segments [Member] | Risk Management [Member]          
Segment Reporting Information [Line Items]          
Total revenues 281.7 223.2 534.4 472.7  
Earnings before income taxes 33.4 13.2 57.5 38.8  
Identifiable assets at June 30, 2021 and 2020 1,058.5 929.1 1,058.5 929.1  
Operating Segments [Member] | Corporate [Member]          
Segment Reporting Information [Line Items]          
Total revenues 261.6 159.7 563.7 341.5  
Earnings before income taxes (110.8) (89.3) (206.8) (169.7)  
Identifiable assets at June 30, 2021 and 2020 $ 4,900.1 $ 1,971.5 $ 4,900.1 $ 1,971.5