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Investments - Contractual Maturity (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Amortized Cost
One year or less	$ 29.9
After one year through five years	76.3
After five years	13.9
Amortized Cost	164.6	$ 127.3
Fair Value
One year or less	29.6
After one year through five years	75.2
After five years	14.5
Fair Value	161.7	121.1
Residential mortgage-backed securities
Amortized Cost
Securities	20.7
Amortized Cost	20.7	20.4
Fair Value
Securities	19.5
Fair Value	19.5	18.9
Commercial mortgage-backed securities
Amortized Cost
Securities	7.7
Amortized Cost	7.7	6.5
Fair Value
Securities	7.1
Fair Value	7.1	5.8
Asset backed securities
Amortized Cost
Securities	16.1
Amortized Cost	16.1	14.2
Fair Value
Securities	15.8
Fair Value	$ 15.8	$ 13.7

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+ References

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