CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
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| Statement of Comprehensive Income [Abstract] | ||
| Change in Net Unrealized Gain on Securities Before Adjustment, Tax expense (benefit) | $ 110.2 | $ (119.2) |
| Change in the Effect of Discount Rate ASsumptions on the LIability for Future Policy Benefits, Net of Reinsurance net of tax expense (benefit) | (42.6) | 234.1 |
| Change in Net Loss on Derivatives, tax expense (benefit) | 11.7 | (14.1) |
| Change in Foreign Currency Translation Adjustment, tax expense (benefit) | (0.2) | 0.3 |
| Change in Unrecognized Pension and Postretirement Benefit Costs, tax expense (benefit) | $ (0.2) | $ 9.4 |
| X | ||||||||||
- Definition Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of hedges. No definition available.
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| X | ||||||||||
- Definition Amount, before reclassification adjustment, of tax expense (benefit) for unrealized gain (loss) from (increase) decrease in liability for future policy benefit from change in discount rate. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, after adjustment, of tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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