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Summary of Significant Accounting Policies - Summary of Changes to Presentation of Statement of Cash Flows (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |
Net change in accounts receivable, net | $ (642.2) | $ (553.2)
Net change in other current assets | 17.3 | 14.0
Net change in accrued compensation and other accrued liabilities | 298.1 | 108.0
Net cash provided by operating activities | 428.5 | 216.6
Cash flows from financing activities: |  |
Net change in fiduciary assets and liabilities |  | 218.0
Net cash provided by (used) by financing activities | $ 958.1 | 17.7
Reported 2022 |  |
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |
Net change in premiums and fees receivable |  | (9,827.3)
Net change in premiums payable to underwriting enterprises |  | 9,331.3
Net change in other current assets |  | 120.1
Net change in accrued compensation and other accrued liabilities |  | 162.7
Net cash provided by operating activities |  | 434.6
Cash flows from financing activities: |  |
Net cash provided by (used) by financing activities |  | (200.3)
Change |  |
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |
Net change in accounts receivable, net |  | (553.2)
Net change in premiums and fees receivable |  | 9,827.3
Net change in premiums payable to underwriting enterprises |  | (9,331.3)
Net change in other current assets |  | (106.1)
Net change in accrued compensation and other accrued liabilities |  | (54.7)
Net cash provided by operating activities |  | (218.0)
Cash flows from financing activities: |  |
Net change in fiduciary assets and liabilities |  | 218.0
Net cash provided by (used) by financing activities |  | $ 218.0

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