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Investments - Reconciliation of Net Unrealized Investment Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Net unrealized investment gains (losses) on fixed maturity securities, net of tax
Beginning balance			$ 1,175.3
Ending balance	$ 1,208.8	$ 1,101.9	1,208.8	$ 1,101.9
Net unrealized investment gains (losses) on securities
Net unrealized investment gains (losses) on fixed maturity securities, net of tax
Beginning balance	(348.0)	(356.4)	(328.3)	(449.6)
Ending balance	(370.4)	(393.7)	(370.4)	(393.7)
Net unrealized investment gains (losses) on securities | Fixed maturity securities
Net unrealized investment gains (losses) on fixed maturity securities, net of tax
Beginning balance	(348.0)	(356.4)	(328.3)	(449.6)
Change in net unrealized investment gains (losses) on fixed maturity securities	(24.1)	(48.9)	(44.6)	42.4
Reclassification of net investment losses on fixed maturity securities to net income	1.7	11.6	2.5	13.5
Ending balance	$ (370.4)	$ (393.7)	$ (370.4)	$ (393.7)

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Amount, after tax and adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

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Amount after 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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Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

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