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Revenues - Schedule of Disaggregated by Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disaggregation Of Revenue [Line Items] |  |  |
Investment Income, Nonoperating | $ 6.5 | $ 1.1 | $ 2.8
Other income, net | 3.7 | 2.8 | 4.5
Total revenues | 3,573.4 | 3,051.4 | 2,613.4
Base Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 2,377.7 | 2,010.0 | 1,751.4
Fee Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 911.2 | 833.0 | 674.0
Other Supplemental Commissions Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 159.2 | 122.3 | 109.7
Profit-Sharing Contingent Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 88.7 | 82.2 | 71.0
Earned premium |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 26.4 | 0.0 | 0.0
Operating Segments | Retail |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment Income, Nonoperating | 0.1 | 0.3 | 0.2
Other income, net | 2.6 | 1.0 | 1.3
Total revenues | 2,084.3 | 1,767.9 | 1,472.8
Operating Segments | Retail | Base Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 1,420.9 | 1,198.1 | 1,054.6
Operating Segments | Retail | Fee Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 473.5 | 414.9 | 275.9
Operating Segments | Retail | Other Supplemental Commissions Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 138.4 | 114.7 | 105.0
Operating Segments | Retail | Profit-Sharing Contingent Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 48.8 | 38.9 | 35.8
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 | 1.3 | 0.6 | 0.8
Other income, net | 0.1 | 0.2 | 0.1
Total revenues | 859.5 | 701.9 | 610.6
Operating Segments | National Programs | Base Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 590.2 | 488.7 | 422.9
Operating Segments | National Programs | Fee Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 198.5 | 173.8 | 159.2
Operating Segments | National Programs | Other Supplemental Commissions Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 15.4 | 3.3 | 0.3
Operating Segments | National Programs | Profit-Sharing Contingent Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 27.6 | 35.3 | 27.3
Operating Segments | National Programs | Earned premium |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 26.4 | 0.0 | 0.0
Operating Segments | Wholesale Brokerage |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment Income, Nonoperating | 0.3 | 0.2 | 0.2
Other income, net | 0.3 | 0.6 | 0.4
Total revenues | 453.4 | 403.4 | 352.8
Operating Segments | Wholesale Brokerage | Base Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 366.6 | 323.1 | 273.9
Operating Segments | Wholesale Brokerage | Fee Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 68.5 | 67.2 | 66.0
Operating Segments | Wholesale Brokerage | Other Supplemental Commissions Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 5.4 | 4.3 | 4.4
Operating Segments | Wholesale Brokerage | Profit-Sharing Contingent Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 12.3 | 8.0 | 7.9
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 | 171.9 | 178.9 | 174.0
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 | 171.9 | 178.9 | 174.0
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
Corporate, Non-Segment |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Investment Income, Nonoperating | 4.8 | 0.0 | 1.6
Other income, net | 0.7 | 1.0 | 2.7
Total revenues | 4.3 | (0.7) | 3.2
Corporate, Non-Segment | Base Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 0.0 | 0.1 | 0.0
Corporate, Non-Segment | Fee Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | (1.2) | (1.8) | (1.1)
Corporate, Non-Segment | Other Supplemental Commissions Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 0.0 | 0.0 | 0.0
Corporate, Non-Segment | Profit-Sharing Contingent Commission Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | 0.0 | 0.0 | 0.0
Corporate, Non-Segment | Earned premium |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Fees and Commissions, Other | $ 0.0 | $ 0.0 | $ 0.0

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