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Investments - Contractual Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Amortized Cost
One year or less	$ 25.2
After one year through five years	76.5
After five years	3.6
Amortized Cost	148.5	$ 127.3
Fair Value
One year or less	24.9
After one year through five years	73.5
After five years	3.5
Fair Value	141.5	121.1
Residential mortgage-backed securities
Amortized Cost
Securities	21.2
Amortized Cost	21.2	20.4
Fair Value
Securities	18.9
Fair Value	18.9	18.9
Commercial mortgage-backed securities
Amortized Cost
Securities	7.7
Amortized Cost	7.7	6.5
Fair Value
Securities	7.0
Fair Value	7.0	5.8
Asset backed securities
Amortized Cost
Securities	14.2
Amortized Cost	14.2	14.2
Fair Value
Securities	13.7
Fair Value	$ 13.7	$ 13.7

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+ References

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