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Derivative Financial Instruments - Effect of Hedges on Consolidated Statements of Operations (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Gains (losses) recognized for hedging relationships          
Net investment income $ 1,731.7 $ 1,586.0 $ 3,285.5 $ 2,852.4 $ 3,633.7
Net realized capital gains (losses) (71.1) [1] (188.8) [1] (154.7) [2] 83.3 [2] 112.1 [2]
Benefits, claims and settlement expenses 3,760.8 3,348.4 7,226.2 5,882.7 6,617.5
Fair Value Hedges | Net investment income          
Gains (losses) recognized for hedging relationships          
Total gain (loss) recognized for hedging relationships 33.6   62.3    
Fair Value Hedges | Net realized capital gains (losses)          
Gains (losses) recognized for hedging relationships          
Total gain (loss) recognized for hedging relationships (0.3)        
Fair Value Hedges | Benefits, claims and settlement expenses          
Gains (losses) recognized for hedging relationships          
Total gain (loss) recognized for hedging relationships (9.8)   (4.3)    
Fair Value Hedges | Interest rate contracts | Net investment income          
Gains (losses) recognized for hedging relationships          
Gain (loss) recognized on hedged item (16.2) 3.5 45.3 (154.4) (28.7)
Gain (loss) recognized on derivatives 15.1 (2.0) (43.9) 151.6 28.6
Amortization of hedged item basis adjustments 1.0 (0.1) (0.2) (1.3) (1.8)
Amounts related to periodic settlements on derivatives 32.2 27.5 60.5 5.2 (10.0)
Total gain (loss) recognized for hedging relationships       1.1 (11.9)
Fair Value Hedges | Interest rate contracts | Benefits, claims and settlement expenses          
Gains (losses) recognized for hedging relationships          
Gain (loss) recognized on hedged item (18.3) (2.6) 0.4    
Gain (loss) recognized on derivatives 18.6 2.5 (2.1)    
Amounts related to periodic settlements on derivatives (10.1) (0.1) (2.6)    
Fair Value Hedges | Foreign exchange contracts | Net investment income          
Gains (losses) recognized for hedging relationships          
Amounts related to periodic settlements on derivatives 1.5   0.6    
Total gain (loss) recognized for hedging relationships   28.9      
Fair Value Hedges | Foreign exchange contracts | Net realized capital gains (losses)          
Gains (losses) recognized for hedging relationships          
Gain (loss) recognized on hedged item (5.7) 0.6 3.7    
Gain (loss) recognized on derivatives 5.4 (0.6) (3.7)    
Fair Value Hedges | Foreign exchange contracts | Benefits, claims and settlement expenses          
Gains (losses) recognized for hedging relationships          
Total gain (loss) recognized for hedging relationships   (0.2)      
Cash Flow Hedges | Net investment income          
Gains (losses) recognized for hedging relationships          
Total gain (loss) recognized for hedging relationships 14.1 12.7 25.5 23.5 25.0
Cash Flow Hedges | Net realized capital gains (losses)          
Gains (losses) recognized for hedging relationships          
Total gain (loss) recognized for hedging relationships 0.1 2.9 3.4 19.1 10.2
Cash Flow Hedges | Benefits, claims and settlement expenses          
Gains (losses) recognized for hedging relationships          
Total gain (loss) recognized for hedging relationships 7.5 6.5 14.1 3.6 (0.5)
Cash Flow Hedges | Interest rate contracts | Gain (loss) reclassified from AOCI on derivatives          
Gains (losses) recognized for hedging relationships          
Net investment income 1.8 2.1 4.1 9.0 15.4
Benefits, claims and settlement expenses (0.1) (0.1) (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 0.1 1.7 1.9 18.5 1.0
Cash Flow Hedges | Interest rate contracts | Benefits, claims and settlement expenses          
Gains (losses) recognized for hedging relationships          
Amounts related to periodic settlements on derivatives 7.6 6.6 14.2 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)   1.2 1.5 0.6 9.2
Cash Flow Hedges | Foreign exchange contracts | Net investment income          
Gains (losses) recognized for hedging relationships          
Amounts related to periodic settlements on derivatives $ 12.3 $ 10.6 $ 21.4 $ 14.5 $ 9.6
[1] Includes realized and unrealized gains (losses). See Note 3, Investments, for further details.
[2] Includes realized and unrealized gains (losses). See Note 5, Investments, for further details.