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Investments - Summary of Fair Value and Amortized Costs (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Amortized Cost, net	$ 5,803.3	$ 5,756.9
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,803.3; 2022, $5,756.9)	5,350.0	5,185.0
Mortgage-backed securities
Schedule of Investments [Line Items]
Amortized Cost, net	637.6	638.2
Gross Unrealized Gains	2.0	1.3
Gross Unrealized Losses	55.6	69.1
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,803.3; 2022, $5,756.9)	584.0	570.4
Other, including U.S. Treasury securities
Schedule of Investments [Line Items]
Amortized Cost, net	424.4	410.0
Gross Unrealized Gains	1.2	0.5
Gross Unrealized Losses	60.6	67.8
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,803.3; 2022, $5,756.9)	365.0	342.7
Municipal bonds
Schedule of Investments [Line Items]
Amortized Cost, net	1,363.0	1,380.9
Gross Unrealized Gains	26.3	16.9
Gross Unrealized Losses	98.5	128.1
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,803.3; 2022, $5,756.9)	1,290.8	1,269.7
Foreign government bonds
Schedule of Investments [Line Items]
Amortized Cost, net	34.1	35.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	1.5	1.6
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,803.3; 2022, $5,756.9)	32.6	33.5
Corporate bonds
Schedule of Investments [Line Items]
Amortized Cost, net	2,155.4	2,161.2
Gross Unrealized Gains	17.2	12.7
Gross Unrealized Losses	229.1	272.2
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,803.3; 2022, $5,756.9)	1,943.5	1,901.7
Other asset-backed securities
Schedule of Investments [Line Items]
Amortized Cost, net	1,188.8	1,131.5
Gross Unrealized Gains	2.9	3.6
Gross Unrealized Losses	57.6	68.1
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,803.3; 2022, $5,756.9)	1,134.1	1,067.0
FNMA
Schedule of Investments [Line Items]
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,803.3; 2022, $5,756.9)	341.3	330.8
FHLMC
Schedule of Investments [Line Items]
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,803.3; 2022, $5,756.9)	279.3	273.3
GNMA
Schedule of Investments [Line Items]
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,803.3; 2022, $5,756.9)	86.8	86.2
Total
Schedule of Investments [Line Items]
Amortized Cost, net	5,803.3	5,756.9
Gross Unrealized Gains	49.6	35.0
Gross Unrealized Losses	502.9	606.9
Fixed maturity securities, available for sale, at fair value (amortized cost, net 2023, $5,803.3; 2022, $5,756.9)	$ 5,350.0	$ 5,185.0

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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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