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Derivative Financial Instruments - Cash Flow Hedges (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Cash Flow Hedges |  |  |  |
Amount of gain (loss) recognized in AOCI on derivatives in cash flow hedging relationships | $ 31.1 | $ (29.3) | $ 52.9 | $ 14.2
Net gains (losses) expected to be reclassified from accumulated OCI into net income in the next 12 months |  |  | 22.1 |
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 |  |  |  | (3.0)
Interest rate contracts | Investment contracts |  |  |  |
Cash Flow Hedges |  |  |  |
Amount of gain (loss) recognized in AOCI on derivatives in cash flow hedging relationships | 0.6 |  | 0.6 |
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 | $ 30.5 | $ (29.3) | $ 52.3 | $ 17.2

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