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Revenues - Schedule of Disaggregated by Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | $ 16.6 | $ 1.2 | $ 33.8 | $ 1.8
Other income, net | 1.8 | 1.2 | 3.9 | 2.0
Total revenues | 1,067.7 | 927.6 | 3,230.9 | 2,672.0
Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 721.0 | 630.1 | 2,176.7 | 1,775.9
Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 257.8 | 246.1 | 747.8 | 686.8
Other Supplemental Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 31.1 | 29.6 | 147.3 | 128.9
Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 27.3 | 7.8 | 87.7 | 58.5
Earned premium |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 12.1 | 11.6 | 33.7 | 18.1
Operating Segments | Retail |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | 0.5 | 0.0 | 1.0 | 0.0
Other income, net | 1.6 | 1.1 | 3.1 | 1.6
Total revenues | 586.0 | 528.2 | 1,874.2 | 1,582.3
Operating Segments | Retail | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 411.2 | 360.6 | 1,297.3 | 1,055.7
Operating Segments | Retail | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 133.8 | 130.6 | 393.8 | 369.4
Operating Segments | Retail | Other Supplemental Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 29.2 | 25.0 | 138.9 | 117.3
Operating Segments | Retail | Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 9.7 | 10.9 | 40.1 | 38.3
Operating Segments | Retail | Earned premium |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0.0 | 0.0 | 0.0 | 0.0
Operating Segments | National Programs |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | 3.8 | 0.3 | 7.0 | 0.6
Other income, net | 0.2 | 0.0 | 0.4 | 0.0
Total revenues | 278.2 | 231.4 | 791.2 | 619.3
Operating Segments | National Programs | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 188.2 | 165.8 | 543.6 | 443.2
Operating Segments | National Programs | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 60.8 | 56.2 | 166.4 | 137.6
Operating Segments | National Programs | Other Supplemental Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 1.0 | 3.7 | 5.1 | 7.7
Operating Segments | National Programs | Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 12.1 | (6.2) | 35.0 | 12.0
Operating Segments | National Programs | Earned premium |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 12.1 | 11.6 | 33.7 | 18.1
Operating Segments | Wholesale Brokerage |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | 0.6 | 0.0 | 1.2 | 0.2
Other income, net | 0.0 | 0.1 | 0.1 | 0.2
Total revenues | 149.6 | 126.3 | 412.0 | 341.6
Operating Segments | Wholesale Brokerage | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 121.5 | 103.7 | 335.7 | 277.1
Operating Segments | Wholesale Brokerage | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 21.1 | 18.4 | 59.1 | 52.0
Operating Segments | Wholesale Brokerage | Other Supplemental Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0.9 | 0.9 | 3.3 | 3.9
Operating Segments | Wholesale Brokerage | Profit-Sharing Contingent Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 5.5 | 3.1 | 12.6 | 8.2
Operating Segments | Wholesale Brokerage | Earned premium |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0.0 | 0.0 | 0.0 | 0.0
Operating Segments | Services |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | 0.0 | 0.0 | 0.0 | 0.0
Other income, net | 0.0 | 0.0 | 0.0 | 0.0
Total revenues | 42.4 | 41.1 | 129.9 | 128.8
Operating Segments | Services | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0.0 | 0.0 | 0.0 | 0.0
Operating Segments | Services | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 42.4 | 41.1 | 129.9 | 128.8
Operating Segments | Services | Other Supplemental Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0.0 | 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 | 0.0
Operating Segments | Services | Earned premium |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0.0 | 0.0 | 0.0 | 0.0
Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Investment Income, Nonoperating | 11.7 | 0.8 | 24.6 | 1.0
Other income, net | 0.0 | 0.0 | 0.3 | 0.1
Total revenues | 11.5 | 0.6 | 23.6 | 0.0
Other | Base Commission Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0.1 | 0.0 | 0.1 | (0.1)
Other | Fee Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | (0.3) | (0.2) | (1.4) | (1.0)
Other | Other Supplemental Commissions Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | 0.0 | 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 | 0.0
Other | Earned premium |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Fees and Commissions, Other | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0

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