Fair Value Measurements - Level 3 Financial Instruments (Details) - Assets measured on recurring basis - Level 3 - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Assets held in separate accounts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	$ 115.0	$ 61.0
Total Realized/Unrealized Gains (Losses) Included in Net Income	(2.0)	1.0
Total Realized/Unrealized Gains (Losses) Included in OCI	0.0	0.0
Purchases	47.0	6.0
Issuances	0.0	0.0
Sales	(1.0)	0.0
Settlements	0.0	0.0
Transfers in to Level 3	0.0	3.0
Transfers out of Level 3	(18.0)	(4.0)
Fair Value, assets, ending balance	141.0	67.0
Change in Unrealized Gains (Losses) Included in Earnings	0.0	0.0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0.0
Stabilizer (Investment Only) and MCG Contracts
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Derivatives, beginning balance	(22.0)	(4.0)
Total Realized/Unrealized Gains (Losses) Included in Net Income	(171.0)	1.0
Total Realized/Unrealized Gains (Losses) Included in OCI	0.0	0.0
Purchases	0.0	0.0
Issues	0.0	(1.0)
Sales	0.0	0.0
Settlements	0.0	0.0
Transfers in to Level 3	0.0	0.0
Transfers out of Level 3	0.0	0.0
Fair Value, Derivatives, ending balance	(193.0)	(4.0)
Change In Unrealized Gains (Losses) Included in Earnings	0.0	0.0
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0.0
FIA
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, Derivatives, beginning balance	(11.0)	(11.0)
Total Realized/Unrealized Gains (Losses) Included in Net Income	2.0	(1.0)
Total Realized/Unrealized Gains (Losses) Included in OCI	0.0	0.0
Purchases	0.0	0.0
Issues	0.0	0.0
Sales	0.0	0.0
Settlements	0.0	1.0
Transfers in to Level 3	0.0	0.0
Transfers out of Level 3	0.0	0.0
Fair Value, Derivatives, ending balance	(9.0)	(11.0)
Change In Unrealized Gains (Losses) Included in Earnings	0.0	0.0
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0.0
U.S. corporate public securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	47.0	28.0
Total Realized/Unrealized Gains (Losses) Included in Net Income	0.0	0.0
Total Realized/Unrealized Gains (Losses) Included in OCI	(1.0)	1.0
Purchases	0.0	0.0
Issuances	0.0	0.0
Sales	0.0	0.0
Settlements	(2.0)	0.0
Transfers in to Level 3	0.0	23.0
Transfers out of Level 3	0.0	0.0
Fair Value, assets, ending balance	44.0	52.0
Change in Unrealized Gains (Losses) Included in Earnings	0.0	0.0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	(1.0)
U.S. corporate private securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	1,002.0	771.0
Total Realized/Unrealized Gains (Losses) Included in Net Income	0.0	0.0
Total Realized/Unrealized Gains (Losses) Included in OCI	(51.0)	29.0
Purchases	26.0	102.0
Issuances	0.0	0.0
Sales	(1.0)	(6.0)
Settlements	(43.0)	(8.0)
Transfers in to Level 3	0.0	0.0
Transfers out of Level 3	(42.0)	0.0
Fair Value, assets, ending balance	891.0	888.0
Change in Unrealized Gains (Losses) Included in Earnings	0.0	0.0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	(51.0)
Foreign corporate public securities and foreign governments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	0.0
Total Realized/Unrealized Gains (Losses) Included in Net Income	0.0
Total Realized/Unrealized Gains (Losses) Included in OCI	0.0
Purchases	3.0
Issuances	0.0
Sales	0.0
Settlements	0.0
Transfers in to Level 3	0.0
Transfers out of Level 3	0.0
Fair Value, assets, ending balance	3.0
Change in Unrealized Gains (Losses) Included in Earnings	0.0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0.0
Foreign corporate private securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	190.0	124.0
Total Realized/Unrealized Gains (Losses) Included in Net Income	(1.0)	(17.0)
Total Realized/Unrealized Gains (Losses) Included in OCI	(27.0)	23.0
Purchases	2.0	48.0
Issuances	0.0	0.0
Sales	(3.0)	(56.0)
Settlements	0.0	0.0
Transfers in to Level 3	3.0	0.0
Transfers out of Level 3	(5.0)	0.0
Fair Value, assets, ending balance	159.0	122.0
Change in Unrealized Gains (Losses) Included in Earnings	0.0	0.0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	(27.0)
Residential mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	16.0	10.0
Total Realized/Unrealized Gains (Losses) Included in Net Income	(1.0)	(1.0)
Total Realized/Unrealized Gains (Losses) Included in OCI	0.0	0.0
Purchases	8.0	22.0
Issuances	0.0	0.0
Sales	0.0	0.0
Settlements	0.0	0.0
Transfers in to Level 3	0.0	0.0
Transfers out of Level 3	(8.0)	0.0
Fair Value, assets, ending balance	15.0	31.0
Change in Unrealized Gains (Losses) Included in Earnings	(1.0)	(1.0)
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0.0
Commercial mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance		12.0
Total Realized/Unrealized Gains (Losses) Included in Net Income		0.0
Total Realized/Unrealized Gains (Losses) Included in OCI		0.0
Purchases		0.0
Issuances		0.0
Sales		0.0
Settlements		(1.0)
Transfers in to Level 3		0.0
Transfers out of Level 3		0.0
Fair Value, assets, ending balance		11.0
Change in Unrealized Gains (Losses) Included in Earnings		0.0
Other asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	48.0	94.0
Total Realized/Unrealized Gains (Losses) Included in Net Income	0.0	0.0
Total Realized/Unrealized Gains (Losses) Included in OCI	0.0	0.0
Purchases	8.0	16.0
Issuances	0.0	0.0
Sales	0.0	0.0
Settlements	(1.0)	(1.0)
Transfers in to Level 3	0.0	0.0
Transfers out of Level 3	0.0	(20.0)
Fair Value, assets, ending balance	55.0	89.0
Change in Unrealized Gains (Losses) Included in Earnings	0.0	0.0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0.0
Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	1,303.0	1,039.0
Total Realized/Unrealized Gains (Losses) Included in Net Income	(2.0)	(18.0)
Total Realized/Unrealized Gains (Losses) Included in OCI	(79.0)	53.0
Purchases	47.0	188.0
Issuances	0.0	0.0
Sales	(4.0)	(62.0)
Settlements	(46.0)	(10.0)
Transfers in to Level 3	3.0	23.0
Transfers out of Level 3	(55.0)	(20.0)
Fair Value, assets, ending balance	1,167.0	1,193.0
Change in Unrealized Gains (Losses) Included in Earnings	(1.0)	(1.0)
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	(79.0)
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	63.0	50.0
Total Realized/Unrealized Gains (Losses) Included in Net Income	(5.0)	1.0
Total Realized/Unrealized Gains (Losses) Included in OCI	0.0	0.0
Purchases	0.0	29.0
Issuances	0.0	0.0
Sales	0.0	0.0
Settlements	0.0	0.0
Transfers in to Level 3	0.0	0.0
Transfers out of Level 3	0.0	0.0
Fair Value, assets, ending balance	58.0	80.0
Change in Unrealized Gains (Losses) Included in Earnings	(5.0)	$ 0.0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	$ 0.0

Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset (liability) measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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- Definition

Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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- Definition

Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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

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No definition available.

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- Definition

Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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Amount of gain (loss) recognized in other comprehensive income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3).

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Amount of issuances of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sales of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfers of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset) out of level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held.

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Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs, Change in Unrealized Gain (Loss)

+ References

No definition available.

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