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Revenues - Schedule of Disaggregated by Revenue (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disaggregation Of Revenue [Line Items]      
Investment Income, Nonoperating $ 52.4 $ 6.5 $ 1.1
Other income, net 5.3 3.7 2.8
Total revenues 4,257.1 3,573.4 3,051.4
Base Commission Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 2,867.5 2,377.7 2,010.0
Fee Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 996.5 911.2 833.0
Other Supplemental Commissions Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 177.8 159.2 122.3
Profit-Sharing Contingent Commission Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 129.9 88.7 82.2
Earned premium      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 27.7 26.4 0.0
Operating Segments | Retail      
Disaggregation Of Revenue [Line Items]      
Investment Income, Nonoperating 1.3 0.1 0.3
Other income, net 4.0 2.6 1.0
Total revenues 2,440.0 2,084.3 1,767.9
Operating Segments | Retail | Base Commission Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 1,690.6 1,420.9 1,198.1
Operating Segments | Retail | Fee Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 530.7 473.5 414.9
Operating Segments | Retail | Other Supplemental Commissions Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 163.5 138.4 114.7
Operating Segments | Retail | Profit-Sharing Contingent Commission Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 49.9 48.8 38.9
Operating Segments | Retail | Earned premium      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 0.0 0.0 0.0
Operating Segments | National Programs      
Disaggregation Of Revenue [Line Items]      
Investment Income, Nonoperating 12.1 1.3 0.6
Other income, net 0.9 0.1 0.2
Total revenues 1,077.3 859.5 701.9
Operating Segments | National Programs | Base Commission Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 736.2 590.2 488.7
Operating Segments | National Programs | Fee Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 226.6 198.5 173.8
Operating Segments | National Programs | Other Supplemental Commissions Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 8.6 15.4 3.3
Operating Segments | National Programs | Profit-Sharing Contingent Commission Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 65.2 27.6 35.3
Operating Segments | National Programs | Earned premium      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 27.7 26.4 0.0
Operating Segments | Wholesale Brokerage      
Disaggregation Of Revenue [Line Items]      
Investment Income, Nonoperating 1.5 0.3 0.2
Other income, net 0.2 0.3 0.6
Total revenues 540.7 453.4 403.4
Operating Segments | Wholesale Brokerage | Base Commission Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 440.5 366.6 323.1
Operating Segments | Wholesale Brokerage | Fee Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 78.0 68.5 67.2
Operating Segments | Wholesale Brokerage | Other Supplemental Commissions Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 5.7 5.4 4.3
Operating Segments | Wholesale Brokerage | Profit-Sharing Contingent Commission Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 14.8 12.3 8.0
Operating Segments | Wholesale Brokerage | Earned premium      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 0.0 0.0 0.0
Operating Segments | Services      
Disaggregation Of Revenue [Line Items]      
Investment Income, Nonoperating 0.0 0.0 0.0
Other income, net 0.0 0.0 0.0
Total revenues 163.1 171.9 178.9
Operating Segments | Services | Base Commission Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 0.0 0.0 0.0
Operating Segments | Services | Fee Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 163.1 171.9 178.9
Operating Segments | Services | Other Supplemental Commissions Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 0.0 0.0 0.0
Operating Segments | Services | Profit-Sharing Contingent Commission Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 0.0 0.0 0.0
Operating Segments | Services | Earned premium      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 0.0 0.0 0.0
Other      
Disaggregation Of Revenue [Line Items]      
Investment Income, Nonoperating 37.5 4.8 0.0
Other income, net 0.2 0.7 1.0
Total revenues 36.0 4.3 (0.7)
Other | Base Commission Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 0.2 0.0 0.1
Other | Fee Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other (1.9) (1.2) (1.8)
Other | Other Supplemental Commissions Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 0.0 0.0 0.0
Other | Profit-Sharing Contingent Commission Revenue      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other 0.0 0.0 0.0
Other | Earned premium      
Disaggregation Of Revenue [Line Items]      
Fees and Commissions, Other $ 0.0 $ 0.0 $ 0.0