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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Condensed Financial Statements |  |  |
Maximum undiscounted future payment obligation | $ 75.1 |  |
Parent company |  |  |
Condensed Financial Statements |  |  |
Cash contribution by affiliated entity | $ 364.6 | $ 196.3 | $ 52.2

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