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Investments - Sales of Fixed Maturity and Equity Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Fixed maturity securities |  |  |  |
Proceeds received | $ 197.0 | $ 68.3 | $ 365.3 | $ 163.8
Gross gains realized | 1.2 | 1.7 | 3.6 | 3.0
Gross losses realized | (2.3) | (0.2) | (5.2) | (3.6)
Equity securities |  |  |  |
Proceeds received | 0.0 | 0.3 | 5.8 | 0.7
Gross gains realized | 0.0 | 0.1 | 1.7 | 0.2
Gross losses realized | $ 0.0 | $ 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 -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563 + Details
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