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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Net Investment Income |  |
Total net investment income | $ 115.9 | $ 105.4
Investment Portfolio |  |
Net Investment Income |  |
Investment expenses | (2.8) | (2.6)
Total net investment income | 91.5 | 79.9
Deposit Asset on Reinsurance |  |
Net Investment Income |  |
Total net investment income | 24.4 | 25.5
Fixed maturity securities | Investment Portfolio |  |
Net Investment Income |  |
Net investment income | 71.6 | 70.4
Equity securities | Investment Portfolio |  |
Net Investment Income |  |
Net investment income | 1.0 | 1.2
Limited partnership interests | Investment Portfolio |  |
Net Investment Income |  |
Net investment income | 16.3 | 6.2
Short-term and other investments | Investment Portfolio |  |
Net Investment Income |  |
Net investment income | $ 5.4 | $ 4.7

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- Definition Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479168/946-830-55-10 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 + Details
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