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Change in Presentation of Fiduciary Assets and Liabilities - Summary of Changes to Presentation of Statement of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash flows from operating activities: |  |  |
Net change in accounts receivable, net | $ (503.5) | $ (319.6) | $ (172.3)
Net change in other current assets | (107.3) | (71.7) | (102.8)
Net change in accrued compensation and other accrued liabilities | 462.9 | 119.0 | 217.3
Net cash provided by operating activities | 2,031.7 | 1,390.0 | 1,392.4
Cash flows from financing activities: |  |  |
Net change in fiduciary assets and liabilities |  | 735.4 | 311.7
Net cash provided by (used) by financing activities | $ 2,873.9 | 212.6 | 2,995.8
Reported 2022 |  |  |
Cash flows from operating activities: |  |  |
Net change in premium and fees receivable |  | (4,789.3) |
Net change in premiums payable to underwriting enterprises |  | 5,084.2 |
Net change in other current assets |  | (47.1) |
Net change in accrued compensation and other accrued liabilities |  | 215.3 |
Net cash provided by operating activities |  | 2,125.4 |
Cash flows from financing activities: |  |  |
Net cash provided by (used) by financing activities |  | (522.8) |
Reported 2021 |  |  |
Cash flows from operating activities: |  |  |
Net change in premium and fees receivable |  |  | 132.9
Net change in premiums payable to underwriting enterprises |  |  | 35.5
Net change in other current assets |  |  | (136.8)
Net change in accrued compensation and other accrued liabilities |  |  | 222.3
Net cash provided by operating activities |  |  | 1,704.1
Cash flows from financing activities: |  |  |
Net cash provided by (used) by financing activities |  |  | 2,684.1
Change |  |  |
Cash flows from operating activities: |  |  |
Net change in accounts receivable, net |  | (319.6) | (172.3)
Net change in premium and fees receivable |  | 4,789.3 | (132.9)
Net change in premiums payable to underwriting enterprises |  | (5,084.2) | (35.5)
Net change in other current assets |  | (24.6) | 34.0
Net change in accrued compensation and other accrued liabilities |  | (96.3) | (5.0)
Net cash provided by operating activities |  | (735.4) | (311.7)
Cash flows from financing activities: |  |  |
Net change in fiduciary assets and liabilities |  | 735.4 | 311.7
Net cash provided by (used) by financing activities |  | $ 735.4 | $ 311.7

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