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Investments - Sales of Fixed Maturity and Equity Securities (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Fixed maturity securities |  |
Proceeds received | $ 62.7 | $ 168.3
Gross gains realized | 0.3 | 2.4
Gross losses realized | (2.7) | (2.9)
Equity securities |  |
Proceeds received | 0.0 | 5.8
Gross gains realized | 0.0 | 1.7
Gross losses realized | $ 0.0 | $ (0.1)

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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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