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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Net Investment Income |  |  |  |
Total net investment income | $ 108.5 | $ 105.2 | $ 208.9 | $ 203.1
Investment Portfolio |  |  |  |
Net Investment Income |  |  |  |
Investment expenses | (2.6) | (2.5) | (6.2) | (5.1)
Total net investment income | 82.5 | 79.4 | 157.2 | 152.4
Deposit Asset on Reinsurance |  |  |  |
Net Investment Income |  |  |  |
Total net investment income | 26.0 | 25.8 | 51.7 | 50.7
Fixed maturity securities | Investment Portfolio |  |  |  |
Net Investment Income |  |  |  |
Net investment income | 65.2 | 62.0 | 132.9 | 120.6
Equity securities | Investment Portfolio |  |  |  |
Net Investment Income |  |  |  |
Net investment income | 0.7 | 4.0 | 3.4 | 5.3
Limited partnership interests | Investment Portfolio |  |  |  |
Net Investment Income |  |  |  |
Net investment income | 15.7 | 13.2 | 20.1 | 26.2
Short-term and other investments | Investment Portfolio |  |  |  |
Net Investment Income |  |  |  |
Net investment income | $ 3.5 | $ 2.7 | $ 7.0 | $ 5.4

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