Investments - Fixed Maturities Securities and Short-term Investments (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Amortized Cost
Amortized Cost	$ 299.3	$ 291.7
Amortized Cost	125.3	152.5
Amortized Cost	424.6	444.2
Gross Unrealized Gains
Gross Unrealized Gains	1.5	3.2
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Gains	1.5	3.2
Gross Unrealized Losses
Gross Unrealized Losses	(2.1)	(1.5)
Gross Unrealized Losses	(0.1)	0.0
Gross Unrealized Losses	(2.2)	(1.5)
Fair Value
Fair Value	298.7	293.4
Fair Value	125.2	152.5
Total investments	423.9	445.9
U.S. government and agencies
Amortized Cost
Amortized Cost	87.4	75.7
Amortized Cost	87.0	103.5
Gross Unrealized Gains
Gross Unrealized Gains	0.0	0.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses
Gross Unrealized Losses	(0.4)	(0.1)
Gross Unrealized Losses	0.0	0.0
Fair Value
Fair Value	87.0	75.7
Fair Value	87.0	103.5
States and other territories
Amortized Cost
Amortized Cost	7.4	8.2
Gross Unrealized Gains
Gross Unrealized Gains	0.0	0.1
Gross Unrealized Losses
Gross Unrealized Losses	(0.1)	(0.1)
Fair Value
Fair Value	7.3	8.2
Corporate securities
Amortized Cost
Amortized Cost	144.9	144.0
Amortized Cost	38.3	49.0
Gross Unrealized Gains
Gross Unrealized Gains	1.4	2.6
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses
Gross Unrealized Losses	(0.4)	(0.2)
Gross Unrealized Losses	(0.1)	0.0
Fair Value
Fair Value	145.9	146.4
Fair Value	38.2	49.0
Residential mortgage-backed securities
Amortized Cost
Amortized Cost	37.0	38.2
Gross Unrealized Gains
Gross Unrealized Gains	0.1	0.4
Gross Unrealized Losses
Gross Unrealized Losses	(1.0)	(0.9)
Fair Value
Fair Value	36.1	37.7
Commercial mortgage-backed securities
Amortized Cost
Amortized Cost	4.1	5.2
Gross Unrealized Gains
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses
Gross Unrealized Losses	(0.1)	(0.2)
Fair Value
Fair Value	4.0	5.0
Asset backed securities
Amortized Cost
Amortized Cost	18.5	20.4
Gross Unrealized Gains
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses
Gross Unrealized Losses	(0.1)	0.0
Fair Value
Fair Value	$ 18.4	$ 20.4

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