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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
Net Investment Income |  |  |  |
Total net investment income | $ 108.4 | $ 108.5 | $ 213.8 | $ 208.9
Investment Portfolio |  |  |  |
Net Investment Income |  |  |  |
Investment expenses | (3.2) | (2.6) | (5.8) | (6.2)
Total net investment income | 82.7 | 82.5 | 162.6 | 157.2
Deposit Asset on Reinsurance |  |  |  |
Net Investment Income |  |  |  |
Total net investment income | 25.7 | 26.0 | 51.2 | 51.7
Fixed maturity securities | Investment Portfolio |  |  |  |
Net Investment Income |  |  |  |
Net investment income | 72.0 | 65.2 | 142.4 | 132.9
Equity securities | Investment Portfolio |  |  |  |
Net Investment Income |  |  |  |
Net investment income | 1.4 | 0.7 | 2.6 | 3.4
Limited partnership interests | Investment Portfolio |  |  |  |
Net Investment Income |  |  |  |
Net investment income | 8.2 | 15.7 | 14.4 | 20.1
Short-term and other investments | Investment Portfolio |  |  |  |
Net Investment Income |  |  |  |
Net investment income | $ 4.3 | $ 3.5 | $ 9.0 | $ 7.0

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