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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Interest on cash and cash equivalents | $ 2.2 | $ 1.2 | $ 4.7 | $ 1.4
Fixed maturities income | 1.5 | 0.6 | 4.1 | 1.1
Short-term investment income | 2.1 | 0.8 | 8.1 | 1.7
Total gross investment income | 5.8 | 2.6 | 16.9 | 4.2
Investment expenses | (0.1) | (0.1) | (0.4) | (0.2)
Net investment income | $ 5.7 | $ 2.5 | $ 16.5 | $ 4.0

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