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Summary of Significant Accounting Policies - Summary of Changes to Presentation of Statement of Cash Flows (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |
Net change in accounts receivable, net | $ (732.3) | $ (559.2)
Net change in other current assets | (29.9) | 3.1
Net change in accrued compensation and other accrued liabilities | 15.0 | (221.6)
Net cash provided by operating activities | 440.9 | 140.4
Cash flows from financing activities: |  |
Net change in fiduciary assets and liabilities |  | 627.9
Net cash provided by (used) by financing activities | $ 2,560.3 | 627.4
Reported 2022 |  |
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |
Net change in premiums and fees receivable |  | (6,892.7)
Net change in premiums payable to underwriting enterprises |  | 6,820.2
Net change in other current assets |  | 118.0
Net change in accrued compensation and other accrued liabilities |  | (195.3)
Net cash provided by operating activities |  | 768.3
Cash flows from financing activities: |  |
Net cash provided by (used) by financing activities |  | (0.5)
Change |  |
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |
Net change in accounts receivable, net |  | (559.2)
Net change in premiums and fees receivable |  | 6,892.7
Net change in premiums payable to underwriting enterprises |  | (6,820.2)
Net change in other current assets |  | (114.9)
Net change in accrued compensation and other accrued liabilities |  | (26.3)
Net cash provided by operating activities |  | (627.9)
Cash flows from financing activities: |  |
Net change in fiduciary assets and liabilities |  | 627.9
Net cash provided by (used) by financing activities |  | $ 627.9

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