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Derivative Financial Instruments - Effect of Hedges on Consolidated Statements of Operations (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Gains (losses) recognized for hedging relationships
Net investment income (loss)		$ 4,449.2	$ 4,091.9	$ 3,838.5
Net realized capital gains (losses)	[1]	(27.3)	(72.2)	(182.1)
Benefits, claims and settlement expenses		8,072.6	7,788.2	6,631.3
Fair Value Hedges | Net investment income
Gains (losses) recognized for hedging relationships
Total gain (loss) recognized for hedging relationships		66.8	62.5
Fair Value Hedges | Benefits, claims and settlement expenses
Gains (losses) recognized for hedging relationships
Total gain (loss) recognized for hedging relationships		(19.9)	(4.3)
Fair Value Hedges | Interest rate contracts | Net investment income
Gains (losses) recognized for hedging relationships
Gain (loss) recognized on hedged item		(4.0)	45.3	(154.4)
Gain (loss) recognized on derivatives		6.1	(43.9)	151.6
Amortization of hedged item basis adjustments		2.6		(1.3)
Amounts related to periodic settlements on derivatives		59.0	60.5	5.2
Total gain (loss) recognized for hedging relationships				1.1
Fair Value Hedges | Interest rate contracts | Benefits, claims and settlement expenses
Gains (losses) recognized for hedging relationships
Gain (loss) recognized on hedged item		(22.3)	0.4
Gain (loss) recognized on derivatives		25.8	(2.1)
Amounts related to periodic settlements on derivatives		(23.4)	(2.6)
Fair Value Hedges | Foreign exchange contracts | Net investment income
Gains (losses) recognized for hedging relationships
Amounts related to periodic settlements on derivatives		3.1	0.6
Fair Value Hedges | Foreign exchange contracts | Net realized capital gains (losses)
Gains (losses) recognized for hedging relationships
Gain (loss) recognized on hedged item		(11.7)	3.7
Gain (loss) recognized on derivatives		11.7	(3.7)
Cash Flow Hedges | Net investment income
Gains (losses) recognized for hedging relationships
Total gain (loss) recognized for hedging relationships		29.5	25.5	23.5
Cash Flow Hedges | Net realized capital gains (losses)
Gains (losses) recognized for hedging relationships
Total gain (loss) recognized for hedging relationships		0.3	3.4	19.1
Cash Flow Hedges | Benefits, claims and settlement expenses
Gains (losses) recognized for hedging relationships
Total gain (loss) recognized for hedging relationships		9.6	14.1	3.6
Cash Flow Hedges | Interest rate contracts | Gain (loss) reclassified from AOCI on derivatives
Gains (losses) recognized for hedging relationships
Net investment income (loss)		3.4	4.1	9.0
Benefits, claims and settlement expenses		(0.2)	(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		0.5	1.9	18.5
Cash Flow Hedges | Interest rate contracts | Benefits, claims and settlement expenses
Gains (losses) recognized for hedging relationships
Amounts related to periodic settlements on derivatives		9.8	14.2	3.7
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)	1.5	0.6
Cash Flow Hedges | Foreign exchange contracts | Net investment income
Gains (losses) recognized for hedging relationships
Amounts related to periodic settlements on derivatives		26.1	21.4	14.5
Net investment hedging relationships
Gains (losses) recognized for hedging relationships
Amount of gain (loss) recognized in AOCI on derivatives		3.5	(0.7)	1.5
Net investment hedging relationships | Gain (loss) reclassified from AOCI on derivatives
Gains (losses) recognized for hedging relationships
Net realized capital gains (losses)		0.0	0.0	0.0
Net investment hedging relationships | Foreign exchange contracts
Gains (losses) recognized for hedging relationships
Amount of gain (loss) recognized in AOCI on derivatives		$ 3.5	$ (0.7)	$ 1.5
[1] Includes realized and unrealized gains (losses). See Note 4, Investments, for further details.

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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.

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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Amount of gain (loss) on derivative instrument designated and qualifying as fair value hedge included in assessment of hedge effectiveness, recognized in earnings.

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