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Derivative Financial Instruments - Effect of Hedges on Consolidated Statements of Operations (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Gains (losses) recognized for hedging relationships |  |  |
Net investment income (loss) |  | $ 986.7 | $ 1,125.5
Net realized capital gains (losses) | [1] | (66.0) | (136.6)
Benefits, claims and settlement expenses |  | 1,773.9 | 1,490.7
Fair Value Hedges | Interest rate contracts | Net investment income |  |  |
Gains (losses) recognized for hedging relationships |  |  |
Gain (loss) recognized on hedged item |  | 26.2 | (71.1)
Gain (loss) recognized on derivatives |  | (22.6) | 68.0
Amortization of hedged item basis adjustments |  | (0.1) | (0.4)
Amounts related to periodic settlements on derivatives |  | 12.6 | (4.2)
Total gain (loss) recognized for hedging relationships |  | 16.1 | (7.7)
Cash Flow Hedges | Net investment income |  |  |
Gains (losses) recognized for hedging relationships |  |  |
Total gain (loss) recognized for hedging relationships |  | 6.5 | 6.0
Cash Flow Hedges | Net realized capital gains (losses) |  |  |
Gains (losses) recognized for hedging relationships |  |  |
Total gain (loss) recognized for hedging relationships |  | 2.6 | 3.5
Cash Flow Hedges | Benefits, claims and settlement expenses |  |  |
Gains (losses) recognized for hedging relationships |  |  |
Total gain (loss) recognized for hedging relationships |  | 3.1 | (0.2)
Cash Flow Hedges | Interest rate contracts | Gain (loss) reclassified from AOCI on derivatives |  |  |
Gains (losses) recognized for hedging relationships |  |  |
Net investment income (loss) |  | 1.1 | 3.3
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 |  | 1.4 | 2.9
Cash Flow Hedges | Interest rate contracts | Benefits, claims and settlement expenses |  |  |
Gains (losses) recognized for hedging relationships |  |  |
Amounts related to periodic settlements on derivatives |  | 3.1 | (0.2)
Cash Flow Hedges | Foreign exchange contracts | Gain (loss) reclassified from AOCI on derivatives |  |  |
Gains (losses) recognized for hedging relationships |  |  |
Net realized capital gains (losses) |  | 1.2 | 0.6
Cash Flow Hedges | Foreign exchange contracts | Net investment income |  |  |
Gains (losses) recognized for hedging relationships |  |  |
Amounts related to periodic settlements on derivatives |  | 5.4 | 2.7
Net investment hedging relationships |  |  |
Gains (losses) recognized for hedging relationships |  |  |
Amount of gain (loss) recognized in accumulated OCI on derivatives |  | (0.6) | (0.7)
Net investment hedging relationships | Foreign exchange contracts |  |  |
Gains (losses) recognized for hedging relationships |  |  |
Amount of gain (loss) recognized in accumulated OCI on derivatives |  | $ (0.6) | $ (0.7)
[1] | Includes realized and unrealized gains (losses). See Note 3, Investments, for further details.

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- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=121577467&loc=d3e76258-113986 + Details
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- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=121577467&loc=d3e76258-113986 + Details
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