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Derivative Financial Instruments - Effect of Hedges on Consolidated Statements of Operations (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Gains (losses) recognized for hedging relationships    
Net investment income (loss) $ 986.7 $ 1,125.5
Net realized capital gains (losses) [1] (66.0) (136.6)
Benefits, claims and settlement expenses 1,773.9 1,490.7
Fair Value Hedges | Interest rate contracts | Net investment income    
Gains (losses) recognized for hedging relationships    
Gain (loss) recognized on hedged item 26.2 (71.1)
Gain (loss) recognized on derivatives (22.6) 68.0
Amortization of hedged item basis adjustments (0.1) (0.4)
Amounts related to periodic settlements on derivatives 12.6 (4.2)
Total gain (loss) recognized for hedging relationships 16.1 (7.7)
Cash Flow Hedges | Net investment income    
Gains (losses) recognized for hedging relationships    
Total gain (loss) recognized for hedging relationships 6.5 6.0
Cash Flow Hedges | Net realized capital gains (losses)    
Gains (losses) recognized for hedging relationships    
Total gain (loss) recognized for hedging relationships 2.6 3.5
Cash Flow Hedges | Benefits, claims and settlement expenses    
Gains (losses) recognized for hedging relationships    
Total gain (loss) recognized for hedging relationships 3.1 (0.2)
Cash Flow Hedges | Interest rate contracts | Gain (loss) reclassified from AOCI on derivatives    
Gains (losses) recognized for hedging relationships    
Net investment income (loss) 1.1 3.3
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 1.4 2.9
Cash Flow Hedges | Interest rate contracts | Benefits, claims and settlement expenses    
Gains (losses) recognized for hedging relationships    
Amounts related to periodic settlements on derivatives 3.1 (0.2)
Cash Flow Hedges | Foreign exchange contracts | Gain (loss) reclassified from AOCI on derivatives    
Gains (losses) recognized for hedging relationships    
Net realized capital gains (losses) 1.2 0.6
Cash Flow Hedges | Foreign exchange contracts | Net investment income    
Gains (losses) recognized for hedging relationships    
Amounts related to periodic settlements on derivatives 5.4 2.7
Net investment hedging relationships    
Gains (losses) recognized for hedging relationships    
Amount of gain (loss) recognized in accumulated OCI on derivatives (0.6) (0.7)
Net investment hedging relationships | Foreign exchange contracts    
Gains (losses) recognized for hedging relationships    
Amount of gain (loss) recognized in accumulated OCI on derivatives $ (0.6) $ (0.7)
[1] Includes realized and unrealized gains (losses). See Note 3, Investments, for further details.