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Investments - Net Unrealized Gains and Losses on Available-for-Sale Securities and Derivative Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Net Unrealized Gains and Losses on Available-for-Sale Securities and Derivative Instruments    
Net unrealized gains (losses) on fixed maturities, available-for-sale $ (307.8) $ 5,289.9
Net unrealized gains (losses) on derivative instruments 52.3 80.1
Adjustments for assumed changes in amortization patterns 81.1 (266.1)
Adjustments for assumed changes in policyholder liabilities (108.6) (689.2)
Net unrealized gains (losses) on other investments and noncontrolling interest adjustments 54.7 40.5
Provision for deferred income tax benefits (taxes) 57.3 (936.0)
Net unrealized gains (losses) on available-for-sale securities and derivative instruments $ (171.0) $ 3,519.2