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Derivative Financial Instruments - Effect of Hedges on Consolidated Statements of Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Gains (losses) recognized for hedging relationships |  |  |  |
Net investment income (loss) | $ 1,093.4 | $ 917.9 | $ 3,167.0 | $ 2,846.1
Net realized capital gains (losses) | (152.0) | 65.5 | (41.7) | 169.5
Benefits, claims and settlement expenses | 1,770.9 | 1,839.8 | 4,958.4 | 6,299.8
Fair Value Hedges | Interest rate contracts | Net investment income |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Gain (loss) recognized on hedged item | (4.0) | (2.1) | (20.5) | 9.1
Gain (loss) recognized on derivatives | 5.4 | 1.8 | 22.2 | (9.7)
Amortization of hedged item basis adjustments | (0.5) | (0.6) | (1.5) | (1.9)
Amounts related to periodic settlements on derivatives | (2.4) | (1.8) | (6.8) | (4.1)
Total gain (loss) recognized for hedging relationships | (1.5) | (2.7) | (6.6) | (6.6)
Fair Value Hedges | Interest rate contracts | Benefits, claims and settlement expenses |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Amounts related to periodic settlements on derivatives | (0.1) |  | (0.1) |
Total gain (loss) recognized for hedging relationships | (0.1) |  | (0.1) |
Cash Flow Hedges | Net investment income |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Total gain (loss) recognized for hedging relationships | 6.4 | 6.4 | 18.9 | 20.0
Cash Flow Hedges | Net realized capital gains (losses) |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Total gain (loss) recognized for hedging relationships | 0.1 | 0.3 | 1.2 | 9.1
Cash Flow Hedges | Benefits, claims and settlement expenses |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Total gain (loss) recognized for hedging relationships |  | (0.1) | (0.1) | (0.1)
Cash Flow Hedges | Interest rate contracts | Gain (loss) reclassified from AOCI on derivatives |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Net investment income (loss) | 3.8 | 4.4 | 11.9 | 13.8
Net realized capital gains (losses) |  | 0.1 |  | 2.7
Benefits, claims and settlement expenses |  | 0.1 | 0.1 | 0.1
Cash Flow Hedges | Interest rate contracts | Net realized capital gains (losses) |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Gain (loss) reclassified from AOCI into net income as a result that a forecasted transaction is no longer probable of occurring | 0.1 |  | 0.5 |
Cash Flow Hedges | Foreign exchange contracts | Gain (loss) reclassified from AOCI on derivatives |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Net realized capital gains (losses) |  | 0.2 | 0.7 | 6.4
Cash Flow Hedges | Foreign exchange contracts | Net investment income |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Amounts related to periodic settlements on derivatives | 2.6 | 2.0 | 7.0 | 6.2
Net investment hedging relationships |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Amount of gain (loss) recognized in accumulated OCI on derivatives | 1.3 | 0.8 | 2.3 | 10.1
Net investment hedging relationships | Gain (loss) reclassified from AOCI on derivatives |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Net realized capital gains (losses) |  | (7.1) |  | (7.1)
Net investment hedging relationships | Foreign exchange contracts |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Amount of gain (loss) recognized in accumulated OCI on derivatives | $ 1.3 | 0.8 | $ 2.3 | 10.1
Net investment hedging relationships | Foreign exchange contracts | Gain (loss) reclassified from AOCI on derivatives |  |  |  |
Gains (losses) recognized for hedging relationships |  |  |  |
Net realized capital gains (losses) |  | $ (7.1) |  | $ (7.1)

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