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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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