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Derivative Financial Instruments - Cash Flow Hedges (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Cash Flow Hedges |  |  |  |
Maximum length of time hedging exposure to variability in future cash flows for forecasted transactions |  |  | 1 year 8 months 12 days |
Net gains (losses) reported in AOCI related to active cash flow hedges of forecasted transactions | $ 10.5 |  | $ 10.5 |
Amount of gain (loss) recognized in AOCI on derivatives in cash flow hedging relationships | (205.5) | $ 30.8 | (188.1) | $ 53.8
Net gains (losses) expected to be reclassified from accumulated OCI into net income in the next 12 months |  |  | 32.8 |
Interest rate contracts - hedged on fixed maturities, available for sale |  |  |  |
Cash Flow Hedges |  |  |  |
Amount of gain (loss) recognized in AOCI on derivatives in cash flow hedging relationships | 4.0 | (6.6) | 10.5 | (10.1)
Interest rate contracts - hedged on investment contracts |  |  |  |
Cash Flow Hedges |  |  |  |
Amount of gain (loss) recognized in AOCI on derivatives in cash flow hedging relationships |  | (3.8) |  | (6.7)
Foreign exchange contracts - hedged on fixed maturities, available for sale |  |  |  |
Cash Flow Hedges |  |  |  |
Amount of gain (loss) recognized in AOCI on derivatives in cash flow hedging relationships | $ (209.5) | $ 41.2 | $ (198.6) | $ 70.6

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- Definition Amount of accumulated gain (loss) on derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References No definition available. + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480870/815-30-50-1 + Details
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- Definition Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480870/815-30-50-1 + Details
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- Definition Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 182 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-182 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-11 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480627/815-20-45-3 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A + Details
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