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Derivative Financial Instruments - Cash Flow Hedges (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Cash Flow Hedges |  |  |  |
Amount of gain (loss) recognized in AOCI on derivatives in cash flow hedging relationships | $ (26.2) | $ 4.3 | $ 43.5 | $ (8.5)
Net gains (losses) expected to be reclassified from accumulated OCI into net income in the next 12 months |  |  | 24.8 |
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 | (7.4) | 0.9 | (3.0) | (3.3)
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 | $ (18.8) | $ 3.4 | $ 46.5 | $ (5.2)

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