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Derivative Financial Instruments - Effect of Hedges on Consolidated Statements of Operations (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Gains (losses) recognized for hedging relationships
Net investment income (loss)		$ 1,165.7	$ 1,072.2
Net realized capital gains (losses)	[1]	(117.1)	(0.9)
Benefits, claims and settlement expenses		2,220.0	2,069.7
Fair Value Hedges | Net investment income
Gains (losses) recognized for hedging relationships
Total gain (loss) recognized for hedging relationships		12.7	17.0
Fair Value Hedges | Benefits, claims and settlement expenses
Gains (losses) recognized for hedging relationships
Total gain (loss) recognized for hedging relationships		(5.3)	(3.1)
Fair Value Hedges | Interest rate contracts | Net investment income
Gains (losses) recognized for hedging relationships
Gain (loss) recognized on hedged item		27.4	(17.7)
Gain (loss) recognized on derivatives		(26.1)	17.5
Amortization of hedged item basis adjustments		0.6	0.4
Amounts related to periodic settlements on derivatives		10.1	16.1
Fair Value Hedges | Interest rate contracts | Benefits, claims and settlement expenses
Gains (losses) recognized for hedging relationships
Gain (loss) recognized on hedged item		35.5	(14.8)
Gain (loss) recognized on derivatives		(36.0)	16.2
Amounts related to periodic settlements on derivatives		(4.8)	(4.5)
Fair Value Hedges | Foreign exchange contracts | Net investment income
Gains (losses) recognized for hedging relationships
Amounts related to periodic settlements on derivatives		0.7	0.7
Fair Value Hedges | Foreign exchange contracts | Net realized capital gains (losses)
Gains (losses) recognized for hedging relationships
Gain (loss) recognized on hedged item		7.8	(4.1)
Gain (loss) recognized on derivatives		(7.8)	4.1
Cash Flow Hedges | Net investment income
Gains (losses) recognized for hedging relationships
Total gain (loss) recognized for hedging relationships		9.1	6.7
Cash Flow Hedges | Benefits, claims and settlement expenses
Gains (losses) recognized for hedging relationships
Total gain (loss) recognized for hedging relationships		(0.1)	3.8
Cash Flow Hedges | Interest rate contracts | Gain (loss) reclassified from AOCI on derivatives
Gains (losses) recognized for hedging relationships
Net investment income (loss)		0.7	0.9
Benefits, claims and settlement expenses		(0.1)
Cash Flow Hedges | Interest rate contracts | Net investment income
Gains (losses) recognized for hedging relationships
Amounts related to periodic settlements on derivatives		(0.1)
Cash Flow Hedges | Interest rate contracts | Benefits, claims and settlement expenses
Gains (losses) recognized for hedging relationships
Amounts related to periodic settlements on derivatives			3.8
Cash Flow Hedges | Foreign exchange contracts | Net investment income
Gains (losses) recognized for hedging relationships
Amounts related to periodic settlements on derivatives		8.5	5.8
Net investment hedging relationships
Gains (losses) recognized for hedging relationships
Amount of gain (loss) recognized in AOCI on derivatives		(1.1)	0.7
Net investment hedging relationships | Foreign exchange contracts
Gains (losses) recognized for hedging relationships
Amount of gain (loss) recognized in AOCI on derivatives		$ (1.1)	$ 0.7
[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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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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Amount of realized and unrealized gain (loss) on investment.

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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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