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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net unrealized investment gains (losses) on fixed maturity securities, net of tax
Beginning balance			$ 1,807.4
Other comprehensive loss before reclassifications	$ (252.7)	$ 93.3	(537.5)	$ (35.8)
Amounts reclassified from AOCI	12.3	(4.7)	26.4	1.7
Other comprehensive income (loss)	(240.4)	88.6	(511.1)	(34.1)
Ending balance	1,260.1	1,816.6	1,260.1	1,816.6
Pretax reclassification amounts from AOCI, tax	(3.2)	1.2	(7.0)	(0.5)
Total
Net unrealized investment gains (losses) on fixed maturity securities, net of tax
Beginning balance	9.8	232.4	280.5	355.1
Ending balance	(230.6)	321.0	(230.6)	321.0
Net Unrealized Investment Gains (Losses) on Securities
Net unrealized investment gains (losses) on fixed maturity securities, net of tax
Beginning balance	20.0	243.6	290.7	366.3
Other comprehensive loss before reclassifications	(252.7)	93.3	(537.5)	(35.8)
Amounts reclassified from AOCI	12.3	(4.7)	26.4	1.7
Other comprehensive income (loss)	(240.4)	88.6	(511.1)	(34.1)
Ending balance	(220.4)	332.2	(220.4)	332.2
Pretax reclassification amounts from accumulated other comprehensive income (loss)	(15.5)	5.9	(33.4)	(2.2)
Net Funded Status of Benefit Plans
Net unrealized investment gains (losses) on fixed maturity securities, net of tax
Beginning balance	(10.2)	(11.2)	(10.2)	(11.2)
Other comprehensive loss before reclassifications	0.0	0.0	0.0	0.0
Amounts reclassified from AOCI	0.0	0.0	0.0	0.0
Other comprehensive income (loss)	0.0	0.0	0.0	0.0
Ending balance	$ (10.2)	$ (11.2)	$ (10.2)	$ (11.2)

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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