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Derivative Financial Instruments - Cash Flow Hedges (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
Cash Flow Hedges          
Maximum length of time hedging exposure to variability in future cash flows for forecasted transactions 2 years 8 months 12 days   6 years 4 months 24 days    
Net gains (losses) reported in AOCI related to active cash flow hedges of forecasted transactions $ (10.1)   $ 30.4    
Amount of gain (loss) recognized in AOCI on derivatives in cash flow hedging relationships 53.8 $ (2.9) (44.6) $ (2.0) $ 57.5
Net gains (losses) expected to be reclassified from accumulated OCI into net income in the next 12 months 25.8   24.5    
Interest rate contracts | Fixed maturities, available-for-sale          
Cash Flow Hedges          
Amount of gain (loss) recognized in AOCI on derivatives in cash flow hedging relationships (10.1) 18.5 30.4 (102.1)  
Interest rate contracts | Investment contracts          
Cash Flow Hedges          
Amount of gain (loss) recognized in AOCI on derivatives in cash flow hedging relationships (6.7) (4.6) (11.0) 15.9 4.1
Foreign exchange contracts | Fixed maturities, available-for-sale          
Cash Flow Hedges          
Amount of gain (loss) recognized in AOCI on derivatives in cash flow hedging relationships $ 70.6 $ (16.8) $ (64.0) $ 84.2 $ 53.4