Derivative Financial Instruments (Narrative) (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Derivative Instruments and Hedging Activities Disclosure [Abstract] | ||||
| Gains or losses reclassified into earnings | $ 0 | $ 0 | $ 0 | $ 0 |
| Estimated net gain (loss) to be reclassified into net income within the next twelve months relating to cash flow hedges | $ 100,000 | |||
| Maximum length of time over which exposure was being hedged | 1 month | |||
| Net investment gains (losses) recognized in AOCI | $ (278,100,000) | $ 18,000,000.0 | $ 99,300,000 | $ (392,400,000) |