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Derivative Financial Instruments - Effect of Hedges on Consolidated Statements of Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Gains (losses) recognized for hedging relationships      
Net investment income (loss) $ 3,830.4 $ 4,406.1 $ 3,890.6
Net realized capital gains (losses) [1] (258.4) 2.5 302.6
Benefits, claims and settlement expenses 6,370.8 7,097.0 8,281.5
Fair Value Hedges | Interest rate contracts | Net investment income      
Gains (losses) recognized for hedging relationships      
Gain (loss) recognized on hedged item (154.4) (28.7) 3.3
Gain (loss) recognized on derivatives 151.6 28.6 (3.8)
Amortization of hedged item basis adjustments (1.3) (1.8) (2.5)
Amounts related to periodic settlements on derivatives 5.2 (10.0) (6.2)
Total gain (loss) recognized for hedging relationships 1.1 (11.9) (9.2)
Cash Flow Hedges | Net investment income      
Gains (losses) recognized for hedging relationships      
Total gain (loss) recognized for hedging relationships 23.5 25.0 26.3
Cash Flow Hedges | Net realized capital gains (losses)      
Gains (losses) recognized for hedging relationships      
Total gain (loss) recognized for hedging relationships 19.1 10.2 9.1
Cash Flow Hedges | Benefits, claims and settlement expenses      
Gains (losses) recognized for hedging relationships      
Total gain (loss) recognized for hedging relationships 3.6 (0.5) (0.1)
Cash Flow Hedges | Interest rate contracts | Gain (loss) reclassified from AOCI on derivatives      
Gains (losses) recognized for hedging relationships      
Net investment income (loss) 9.0 15.4 18.1
Net realized capital gains (losses)     2.7
Benefits, claims and settlement expenses (0.1) (0.1) (0.1)
Cash Flow Hedges | Interest rate contracts | Net realized capital gains (losses)      
Gains (losses) recognized for hedging relationships      
Gain (loss) reclassified from AOCI into net income as a result that a forecasted transaction is no longer probable of occurring 18.5 1.0 0.1
Cash Flow Hedges | Interest rate contracts | Benefits, claims and settlement expenses      
Gains (losses) recognized for hedging relationships      
Amounts related to periodic settlements on derivatives 3.7 (0.4)  
Cash Flow Hedges | Foreign exchange contracts | Gain (loss) reclassified from AOCI on derivatives      
Gains (losses) recognized for hedging relationships      
Net realized capital gains (losses) 0.6 9.2 6.3
Cash Flow Hedges | Foreign exchange contracts | Net investment income      
Gains (losses) recognized for hedging relationships      
Amounts related to periodic settlements on derivatives 14.5 9.6 8.2
Net investment hedging relationships      
Gains (losses) recognized for hedging relationships      
Amount of gain (loss) recognized in accumulated OCI on derivatives 1.5 2.9 7.9
Net investment hedging relationships | Gain (loss) reclassified from AOCI on derivatives      
Gains (losses) recognized for hedging relationships      
Net realized capital gains (losses)     (7.1)
Net investment hedging relationships | Foreign exchange contracts      
Gains (losses) recognized for hedging relationships      
Amount of gain (loss) recognized in accumulated OCI on derivatives $ 1.5 $ 2.9 7.9
Net investment hedging relationships | Foreign exchange contracts | Gain (loss) reclassified from AOCI on derivatives      
Gains (losses) recognized for hedging relationships      
Net realized capital gains (losses)     $ (7.1)
[1] Includes realized and unrealized gains (losses). See Note 4, Investments, for further details.