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Summary of Significant Accounting Policies - Schedule of Fiduciary Assets and Liabilities and Statement of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fiduciary Assets and Liabilities |  |  |
Cash and cash equivalents | $ 700.3 | $ 650.0 | $ 693.2
Fiduciary cash | 1,602.6 | 1,383.2 |
Total assets | 14,883.4 | 13,973.5 | 9,795.4
Commission, fees and other receivables | 789.7 | 642.9 |
Fiduciary receivables | 1,124.6 | 881.4 |
Accounts payable | 458.9 | 286.5 |
Fiduciary liabilities | 2,727.2 | 2,264.6 |
Cash flows from operating activities: |  |  |
Premiums, commissions and fees receivable | (106.4) | (60.9) | (61.9)
Accounts payable | 260.0 | 124.3 | 54.4
Cash flows from financing activities: |  |  |
Fiduciary receivables and liabilities, net | $ 188.5 | $ 96.2 | $ 133.7

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