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Investments - Sales of Fixed Maturity and Equity Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fixed maturity securities |  |  |  |
Proceeds received | $ 153.1 | $ 9.3 | $ 283.0 | $ 202.3
Gross gains realized | 0.8 | 0.1 | 2.5 | 2.1
Gross losses realized | (1.2) | 0.0 | (3.7) | (5.3)
Equity securities |  |  |  |
Proceeds received | 10.1 | 0.0 | 16.4 | 0.0
Gross gains realized | 0.0 | 0.0 | 0.0 | 0.0
Gross losses realized | $ (0.1) | $ 0.0 | $ (0.1) | $ 0.0

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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + Details
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- Definition Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-4 + Details
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