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Derivative Financial Instruments (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Derivative [Line Items]        
Gains or losses reclassified into earnings $ 0 $ 0 $ 0 $ 0
Maximum length of time over which exposure was being hedged     3 months  
Net investment gains (losses) recognized in AOCI $ (30,600,000) $ 204,300,000 $ (63,100,000) $ 263,700,000
Cash Flow Hedge, Foreign Currency Denominated Transactions        
Derivative [Line Items]        
Estimated net gain (loss) to be reclassified into net income within the next twelve months relating to cash flow hedges     300,000  
Cash Flow Hedges, Foreign-Currency-Denominated Debt Securities        
Derivative [Line Items]        
Estimated net gain (loss) to be reclassified into net income within the next twelve months relating to cash flow hedges     $ 17,900,000