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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Interest on cash and cash equivalents | $ 2.8 | $ 1.3 | $ 5.0 | $ 2.5
Fixed maturities income | 1.9 | 1.2 | 3.7 | 2.6
Short-term investment income | 1.5 | 3.0 | 3.5 | 6.0
Total gross investment income | 6.2 | 5.5 | 12.2 | 11.1
Investment expenses | (0.1) | (0.1) | (0.2) | (0.3)
Net investment income | $ 6.1 | $ 5.4 | $ 12.0 | $ 10.8

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