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Income Taxes - Summary of Total Income Tax (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Income tax (benefit)/expense allocated to net income | $ (132.1) | $ (78.1) | $ 5.3
Income tax expense/(benefit) allocated to other comprehensive income | 20.6 | (23.9) | 0.3
Total income tax (benefit)/expense | $ (111.5) | $ (102.0) | $ 5.6

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