Insurance Liabilities - Changes in GMBD liability (Details) - Guaranteed Minimum Death Benefit - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Variable Annuity
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]
Balance, beginning of year	$ 445.0	$ 382.0	$ 371.0
Reserve increase (decrease)	109.0	103.0	36.0
Paid guaranteed benefits	(67.0)	(33.0)	(41.0)
Changes related to unrealized appreciation (depreciation) of investments	(53.0)	(7.0)	16.0
Balance, end of year	434.0	445.0	382.0
Assumed reinsurance reserves	14.0	16.0	16.7
Variable Annuity, Excluding Assumed Reinsurance
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]
Balance, beginning of year	35.0	40.0	21.0
Reserve increase (decrease)	12.0	3.0	2.0
Paid guaranteed benefits	(2.0)	(2.0)	(2.0)
Changes related to unrealized appreciation (depreciation) of investments	(29.0)	(6.0)	19.0
Balance, end of year	$ 16.0	$ 35.0	$ 40.0

Liabilities For Guarantees On Long-Duration Contracts, Guaranteed Benefit Liability, Assumed Reinsurance Reserves

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- Definition

Liabilities For Guarantees On Long-Duration Contracts, Guaranteed Benefit Liability, Net, Reserve Increase (Decrease)

+ References

No definition available.

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- Definition

Amount of expected guaranteed benefits in excess of the projected account balances for minimum guaranteed benefit contracts, net of reinsurance recoverables, as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 80
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- Definition

Net amount of other increases or decreases to the liability for guaranteed minimum benefits on long-duration contracts occurring during the period.

+ References

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- Definition

Amount of cash outflow to policyholders and contract holders for guaranteed minimum benefit payments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 80
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-Paragraph 1
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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