Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Amount of gain (loss) included in earnings for investments classified as other.

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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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Derivative Financial Instruments - Net Realized Gains (Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (193.0)	$ 104.0	$ 24.0
Net investment income	1,689.0	1,623.0	1,520.0
Other net realized capital gains (losses)	(101.0)	(222.0)	(188.0)
Other Comprehensive Income (Loss) \| Designated as Hedging Instrument \| Cash flow hedges \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	2.0
Other Comprehensive Income (Loss) \| Designated as Hedging Instrument \| Cash flow hedges \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0.0
Investment Income \| Designated as Hedging Instrument \| Cash flow hedges \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0.0
Investment Income \| Designated as Hedging Instrument \| Cash flow hedges \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	10.0
Net realized gains (losses) on derivatives	10.0
Other Net Realized Capital Gains (Losses) \| Fixed maturities
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	2.0	(4.0)	(5.0)
Other Net Realized Capital Gains (Losses) \| Within products
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(11.0)	94.0	55.0
Other Net Realized Capital Gains (Losses) \| Designated as Hedging Instrument \| Cash flow hedges \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Net realized gains (losses) on derivatives	0.0
Other Net Realized Capital Gains (Losses) \| Not Designated as Hedging Instrument \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(85.0)	(44.0)	(7.0)
Other Net Realized Capital Gains (Losses) \| Not Designated as Hedging Instrument \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	1.0	1.0	(3.0)
Other Net Realized Capital Gains (Losses) \| Not Designated as Hedging Instrument \| Equity contracts
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	1.0	0.0	1.0
Other Net Realized Capital Gains (Losses) \| Not Designated as Hedging Instrument \| Credit contracts
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	1.0	(1.0)	5.0
Interest Credited and Other Benefits to Contract Owners \| Within reinsurance agreements
Derivatives, Fair Value [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (102.0)	$ 58.0	$ (22.0)