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Revenues - Schedule of Disaggregated by Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Disaggregation Of Revenue [Line Items] |  |
Investment Income, Nonoperating | $ 7.0 | $ 0.2
Other income, net | 1.0 | 0.2
Total revenues | 1,116.0 | 904.7
Base Commission Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 746.7 | 589.1
Fee Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 238.0 | 206.6
Other Supplemental Commissions Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 86.5 | 78.9
Profit-Sharing Contingent Commission Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 26.8 | 28.6
Earned premium |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 10.0 | 1.1
Operating Segments | Retail |  |
Disaggregation Of Revenue [Line Items] |  |
Investment Income, Nonoperating | 0.2 | 0.0
Other income, net | 0.5 | 0.1
Total revenues | 713.5 | 596.4
Operating Segments | Retail | Base Commission Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 488.9 | 393.5
Operating Segments | Retail | Fee Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 126.1 | 112.7
Operating Segments | Retail | Other Supplemental Commissions Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 82.4 | 72.2
Operating Segments | Retail | Profit-Sharing Contingent Commission Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 15.4 | 17.9
Operating Segments | Retail | Earned premium |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 0.0 | 0.0
Operating Segments | National Programs |  |
Disaggregation Of Revenue [Line Items] |  |
Investment Income, Nonoperating | 1.2 | 0.1
Other income, net | 0.2 | 0.0
Total revenues | 229.8 | 162.2
Operating Segments | National Programs | Base Commission Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 157.8 | 117.3
Operating Segments | National Programs | Fee Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 50.3 | 34.6
Operating Segments | National Programs | Other Supplemental Commissions Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 2.4 | 1.1
Operating Segments | National Programs | Profit-Sharing Contingent Commission Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 7.9 | 8.0
Operating Segments | National Programs | Earned premium |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 10.0 | 1.1
Operating Segments | Wholesale Brokerage |  |
Disaggregation Of Revenue [Line Items] |  |
Investment Income, Nonoperating | 0.2 | 0.1
Other income, net | 0.1 | 0.1
Total revenues | 123.4 | 102.9
Operating Segments | Wholesale Brokerage | Base Commission Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 100.0 | 78.3
Operating Segments | Wholesale Brokerage | Fee Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 17.9 | 16.1
Operating Segments | Wholesale Brokerage | Other Supplemental Commissions Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 1.7 | 5.6
Operating Segments | Wholesale Brokerage | Profit-Sharing Contingent Commission Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 3.5 | 2.7
Operating Segments | Wholesale Brokerage | Earned premium |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 0.0 | 0.0
Operating Segments | Services |  |
Disaggregation Of Revenue [Line Items] |  |
Investment Income, Nonoperating | 0.0 | 0.0
Other income, net | 0.0 | 0.0
Total revenues | 44.3 | 43.6
Operating Segments | Services | Base Commission Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 0.0 | 0.0
Operating Segments | Services | Fee Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 44.3 | 43.6
Operating Segments | Services | Other Supplemental Commissions Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 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
Operating Segments | Services | Earned premium |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 0.0 | 0.0
Corporate, Non-Segment |  |
Disaggregation Of Revenue [Line Items] |  |
Investment Income, Nonoperating | 5.4 | 0.0
Other income, net | 0.2 | 0.0
Total revenues | 5.0 | (0.4)
Corporate, Non-Segment | Base Commission Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 0.0 | 0.0
Corporate, Non-Segment | Fee Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | (0.6) | (0.4)
Corporate, Non-Segment | Other Supplemental Commissions Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | 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
Corporate, Non-Segment | Earned premium |  |
Disaggregation Of Revenue [Line Items] |  |
Fees and Commissions, Other | $ 0.0 | $ 0.0

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