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Stockholders' Equity - Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Comprehensive Income (Loss)
Other comprehensive income (loss), pre-tax	$ (903.8)	$ 1,683.6	$ 3,326.3
Other comprehensive income (loss), tax	128.1	(336.6)	(719.6)
Other comprehensive income (loss)	(775.7)	1,347.0	2,606.7
Net unrealized gains (losses) on available-for-sale securities including NCI
Other Comprehensive Income (Loss)
Other comprehensive income (loss) before reclassifications, pre-tax	(2,960.0)	3,441.4	4,414.1
Adjustments for assumed changes in amortization patterns, pre-tax	171.4	(179.0)	(293.0)
Adjustments for assumed changes in policyholder liabilities, pre-tax	1,913.1	(1,478.2)	(847.7)
Other comprehensive income (loss), pre-tax	(856.1)	1,731.3	3,320.8
Other comprehensive income (loss) before reclassifications, tax	665.4	(728.7)	(947.0)
Reclassification from accumulated other comprehensive income, tax	(5.1)	12.6	(9.7)
Adjustments for assumed changes in amortization patterns, tax	(36.0)	37.6	61.5
Adjustments for assumed changes in policyholder liabilities, tax	(439.1)	323.7	190.5
Other comprehensive income (loss), tax	185.2	(354.8)	(704.7)
Other comprehensive income (loss) before reclassifications, after-tax	(2,294.6)	2,712.7	3,467.1
Reclassification from accumulated other comprehensive income, after-tax	14.3	(40.3)	37.7
Adjustments for assumed changes in amortization patterns, after-tax	135.4	(141.4)	(231.5)
Adjustments for assumed changes in policyholder liabilities, after-tax	1,474.0	(1,154.5)	(657.2)
Other comprehensive income (loss)	(670.9)	1,376.5	2,616.1
Net unrealized gains (losses) on available-for-sale securities including NCI | Net realized capital gains (losses)
Other Comprehensive Income (Loss)
Reclassification from accumulated other comprehensive income, pre-tax	19.4	(52.9)	47.4
Net unrealized gains (losses) on derivative instruments including NCI
Other Comprehensive Income (Loss)
Other comprehensive income (loss) before reclassifications, pre-tax	66.7	(28.1)	(0.5)
Reclassification from accumulated other comprehensive income, pre-tax	(25.5)	(27.1)	(23.9)
Adjustments for assumed changes in amortization patterns, pre-tax	(0.2)	2.7	3.1
Adjustments for assumed changes in policyholder liabilities, pre-tax	1.6	7.8	7.9
Other comprehensive income (loss), pre-tax	42.6	(44.7)	(13.4)
Other comprehensive income (loss) before reclassifications, tax	(14.0)	6.5
Reclassification from accumulated other comprehensive income, tax	5.4	5.1	4.9
Adjustments for assumed changes in amortization patterns, tax		(0.5)	(0.6)
Adjustments for assumed changes in policyholder liabilities, tax	(0.4)	(1.6)	(1.9)
Other comprehensive income (loss), tax	(9.0)	9.5	2.4
Other comprehensive income (loss) before reclassifications, after-tax	52.7	(21.6)	(0.5)
Reclassification from accumulated other comprehensive income, after-tax	(20.1)	(22.0)	(19.0)
Adjustments for assumed changes in amortization patterns, after-tax	(0.2)	2.2	2.5
Adjustments for assumed changes in policyholder liabilities, after-tax	1.2	6.2	6.0
Other comprehensive income (loss)	33.6	(35.2)	(11.0)
Foreign currency translation adjustment relating to noncontrolling interest | Net income attributable to noncontrolling interest
Other Comprehensive Income (Loss)
Reclassification from accumulated other comprehensive income, pre-tax		8.7	5.7
Foreign currency translation adjustment including NCI
Other Comprehensive Income (Loss)
Other comprehensive income (loss) before reclassifications, pre-tax	(267.9)	(11.7)	(112.3)
Other comprehensive income (loss), pre-tax	(248.6)	31.3	(86.2)
Other comprehensive income (loss) before reclassifications, tax	(5.6)	(2.6)	7.5
Reclassification from accumulated other comprehensive income, tax		1.9
Other comprehensive income (loss), tax	(5.6)	(0.7)	7.5
Other comprehensive income (loss) before reclassifications, after-tax	(273.5)	(14.3)	(104.8)
Reclassification from accumulated other comprehensive income, after-tax	19.3	44.9	26.1
Other comprehensive income (loss)	(254.2)	30.6	(78.7)
Foreign currency translation adjustment including NCI | Net realized capital gains (losses)
Other Comprehensive Income (Loss)
Reclassification from accumulated other comprehensive income, pre-tax	19.3	43.0	26.1
Unrecognized postretirement benefit obligation including NCI
Other Comprehensive Income (Loss)
Other comprehensive income (loss) before reclassifications, pre-tax	106.5	(91.9)	43.6
Other comprehensive income (loss), pre-tax	158.3	(34.3)	101.3
Other comprehensive income (loss) before reclassifications, tax	(28.5)	24.9	(8.6)
Reclassification from accumulated other comprehensive income, tax	(14.0)	(15.5)	(15.4)
Other comprehensive income (loss), tax	(42.5)	9.4	(24.0)
Other comprehensive income (loss) before reclassifications, after-tax	78.0	(67.0)	35.0
Reclassification from accumulated other comprehensive income, after-tax	37.8	42.1	42.3
Other comprehensive income (loss)	115.8	(24.9)	77.3
Unrecognized postretirement benefit obligation including NCI | Operating expense
Other Comprehensive Income (Loss)
Reclassification from accumulated other comprehensive income, pre-tax	$ 51.8	$ 57.6	57.7
Noncredit component of impairment losses on fixed maturities available-for-sale including NCI
Other Comprehensive Income (Loss)
Other comprehensive income (loss) before reclassifications, pre-tax			5.2
Adjustments for assumed changes in amortization patterns, pre-tax			(1.4)
Other comprehensive income (loss), pre-tax			3.8
Other comprehensive income (loss) before reclassifications, tax			(1.1)
Adjustments for assumed changes in amortization patterns, tax			0.3
Other comprehensive income (loss), tax			(0.8)
Other comprehensive income (loss) before reclassifications, after-tax			4.1
Adjustments for assumed changes in amortization patterns, after-tax			(1.1)
Other comprehensive income (loss)			$ 3.0

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