Investments - Amortized Cost, Allowance for Credit Losses, Gross Unrealized Gains and Losses, and Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	$ 9,560.3	$ 8,635.3
Fixed maturity securities available for sale, allowances for credit losses	0.0	(1.9)
Fixed maturity securities, gross unrealized gains	24.8	174.9
Fixed maturity securities, gross unrealized losses	(530.2)	(230.6)
Fixed maturity securities, fair value	9,054.9	8,577.7
U.S. government and government agencies and authorities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	85.3	62.7
Fixed maturity securities available for sale, allowances for credit losses	0.0	0.0
Fixed maturity securities, gross unrealized gains	0.0	1.0
Fixed maturity securities, gross unrealized losses	(3.4)	(0.8)
Fixed maturity securities, fair value	81.9	62.9
States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	72.4	100.0
Fixed maturity securities available for sale, allowances for credit losses	0.0	0.0
Fixed maturity securities, gross unrealized gains	0.1	1.2
Fixed maturity securities, gross unrealized losses	(7.0)	(5.1)
Fixed maturity securities, fair value	65.5	96.1
Foreign governments
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	651.6	596.1
Fixed maturity securities available for sale, allowances for credit losses	0.0	0.0
Fixed maturity securities, gross unrealized gains	3.3	9.1
Fixed maturity securities, gross unrealized losses	(18.1)	(11.3)
Fixed maturity securities, fair value	636.8	593.9
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	820.0	850.2
Fixed maturity securities available for sale, allowances for credit losses	0.0	0.0
Fixed maturity securities, gross unrealized gains	7.0	4.6
Fixed maturity securities, gross unrealized losses	(12.2)	(9.1)
Fixed maturity securities, fair value	814.8	845.7
Commercial mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	512.9	431.4
Fixed maturity securities available for sale, allowances for credit losses	0.0	0.0
Fixed maturity securities, gross unrealized gains	0.7	5.3
Fixed maturity securities, gross unrealized losses	(30.8)	(19.3)
Fixed maturity securities, fair value	482.8	417.4
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	1,274.0	978.6
Fixed maturity securities available for sale, allowances for credit losses	0.0	0.0
Fixed maturity securities, gross unrealized gains	0.1	11.5
Fixed maturity securities, gross unrealized losses	(87.5)	(35.4)
Fixed maturity securities, fair value	1,186.6	954.7
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	4,184.2	3,895.5
Fixed maturity securities available for sale, allowances for credit losses	0.0	(1.9)
Fixed maturity securities, gross unrealized gains	5.9	97.3
Fixed maturity securities, gross unrealized losses	(277.7)	(113.3)
Fixed maturity securities, fair value	3,912.4	3,877.6
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, cost or amortized cost	1,959.9	1,720.8
Fixed maturity securities available for sale, allowances for credit losses	0.0	0.0
Fixed maturity securities, gross unrealized gains	7.7	44.9
Fixed maturity securities, gross unrealized losses	(93.5)	(36.3)
Fixed maturity securities, fair value	$ 1,874.1	$ 1,729.4

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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