Investments - Fixed Maturities Securities and Short-Term Investments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 164.6	$ 127.3
Unrealized Gains	1.2	0.2
Unrealized Losses	(4.1)	(6.4)
Fair Value	161.7	121.1
Amortized Cost	187.1	325.6
Unrealized Gains	0.0	0.0
Unrealized Losses	0.0	(0.8)
Fair Value	187.1	324.8
Amortized Cost	351.7	452.9
Unrealized Gains	1.2	0.2
Unrealized Losses	(4.1)	(7.2)
Total investments	348.8	445.9
U.S. government and agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	18.6	21.6
Unrealized Gains	0.0	0.0
Unrealized Losses	(0.2)	(0.5)
Fair Value	18.4	21.1
Amortized Cost	137.7	129.1
Unrealized Gains	0.0	0.0
Unrealized Losses	0.0	(0.2)
Fair Value	137.7	128.9
States and other territories
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9.3	8.9
Unrealized Gains	0.0	0.0
Unrealized Losses	(0.4)	(0.6)
Fair Value	8.9	8.3
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	91.3	54.8
Unrealized Gains	1.1	0.1
Unrealized Losses	(1.3)	(2.4)
Fair Value	91.1	52.5
Amortized Cost	14.9	49.4
Unrealized Gains	0.0	0.0
Unrealized Losses	0.0	0.0
Fair Value	14.9	49.4
Foreign securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	0.9	0.9
Unrealized Gains	0.0	0.0
Unrealized Losses	0.0	(0.1)
Fair Value	0.9	0.8
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	20.7	20.4
Unrealized Gains	0.1	0.1
Unrealized Losses	(1.3)	(1.6)
Fair Value	19.5	18.9
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7.7	6.5
Unrealized Gains	0.0	0.0
Unrealized Losses	(0.6)	(0.7)
Fair Value	7.1	5.8
Asset backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	16.1	14.2
Unrealized Gains	0.0	0.0
Unrealized Losses	(0.3)	(0.5)
Fair Value	15.8	13.7
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	34.5	147.1
Unrealized Gains	0.0	0.0
Unrealized Losses	0.0	(0.6)
Fair Value	$ 34.5	$ 146.5

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