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Segment Information - Pre-tax net Realized Capital Gains (Losses) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Information: Net realized capital gains (losses), as adjusted
Net realized capital gains (losses)	[1]	$ (27.3)	$ (72.2)	$ (182.1)
Reconciling items
Segment Information: Net realized capital gains (losses), as adjusted
Net realized capital gains (losses)		(27.3)	(72.2)	(182.1)
Derivative and hedging-related revenue adjustments		46.0	23.3	(91.3)
Certain variable annuity fees		71.3	73.3	75.9
Market value adjustments to fee revenues		0.1	1.3	0.7
Equity method investments		(17.3)	8.8	(15.0)
Sponsored investment funds and other adjustments		29.9	23.4	22.2
Net realized capital gains (losses), net of related revenue adjustments		102.7	57.9	(189.6)
Amortization of deferred acquisition costs and other actuarial balances		(1.8)	(0.2)	(0.1)
Capital (gains) losses distributed		(171.1)	(78.5)	136.4
Derivative and hedging-related expense adjustments		(3.5)	1.8
Market value adjustments of market risk benefits		(43.9)	(71.3)	(157.2)
Market value adjustments of embedded derivatives		(24.7)	1.7	(40.9)
Net realized capital gains (losses), net of related expense adjustments		(245.0)	(146.5)	(61.8)
Pre-tax net realized capital gains (losses), as adjusted		$ (142.3)	$ (88.6)	$ (251.4)
[1] Includes realized and unrealized gains (losses). See Note 4, Investments, for further details.

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- Definition

Adjustment to move amounts reported in benefits, claims and settlement expenses to net realized capital gains (losses) for segment profit (loss) reporting related to net realized capital gains (losses) distributed to participating insurance or investment contract participants through interest crediting.

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The amount of adjustment to net realized capital losses related to certain variable annuity fees.

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Adjustment to move amounts reported in operating expenses and benefits, claims and settlement expenses to net realized capital gains (losses) for segment profit (loss) reporting related to the portion of amortization expense from deferred acquisition costs and other actuarial balances, respectively, attributable to the portion of estimated gross profits related to net realized capital gains (losses).

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Net impact to revenue of (1) adjustment for periodic settlements and accruals on derivatives not designated as hedging instruments to move that amount from net realized capital gains (losses) to net investment income for segment profit (loss) reporting, (2) adjustment for mark-to-market adjustments on derivatives and hedged items to move that amount from net investment income to net realized capital gains (losses) for segment profit (loss) reporting and (3) amortization of the cumulative fair value adjustment for assets that have had fair value hedge accounting terminated to move that amount from net investment income to net realized capital gains (losses) for segment profit (loss) reporting.

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Net impact to expense of adjustment for mark-to-market adjustments on derivatives and hedged items to move that amount from benefits, claims and settlement expense to net realized capital gains (losses) for segment profit (loss) reporting.

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Adjustment to move amounts reported in net investment income to net realized capital gains (losses) for segment profit (loss) reporting related to equity method investments.

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Adjustment to net realized capital gains (losses) related to market value adjustments of market risk benefits.

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Adjustment for the portion of the change in fair value of embedded derivatives related to customer behavior-related impacts, which is a risk we assume, to move that amount to benefits, claims and settlement expenses for segment profit (loss) reporting.

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Adjustment to move amounts reported in fees and other revenues to net realized capital gains (losses) for segment profit (loss) reporting related to participating contract cash out gains/losses related to net realized capital losses/gains on the sale of invested assets used to fund the cash out of the contract at market value.

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Net realized capital gains (losses) net of recognition of deferred front-end fee revenues for sales charges on retirement products and services and certain market value adjustments to fee revenues. It excludes periodic settlements and accruals on derivatives not designated as hedging instruments.

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The amount of net realized capital gains (losses), net of expense adjustments.

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Pre-tax net realized capital gains (losses) are net of related changes in the amortization pattern of deferred acquisition costs and related actuarial balances, recognition of deferred front-end fee revenues for sales charges on retirement and life insurance products and services, amortization of hedge accounting book value adjustments for certain discontinued hedges, net realized capital gains and losses distributed, noncontrolling interest capital gains and losses, certain adjustments related to seed money and certain market value adjustments to fee revenues. Pre-tax net realized capital gains (losses), as adjusted, exclude periodic settlements and accruals on derivative instruments not designated as hedging instruments and exclude certain market value adjustments of embedded derivatives and realized capital gains (losses) associated with our exited group medical insurance business.

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Adjustment to move amounts reported in net investment income to net realized capital gains (losses) for segment profit (loss) reporting related to sponsored investment funds and also relating to other adjustments.

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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