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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

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