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Investments - Reconciliation of Net Unrealized Investment Gains (Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |  |  |
Beginning balance |  |  | $ 1,807.4 |
Ending balance | $ 1,260.1 | $ 1,816.6 | 1,260.1 | $ 1,816.6
Net unrealized investment gains (losses) on securities |  |  |  |
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |  |  |
Beginning balance | 20.0 | 243.6 | 290.7 | 366.3
Ending balance | (220.4) | 332.2 | (220.4) | 332.2
Net unrealized investment gains (losses) on securities | Fixed maturity securities |  |  |  |
Net unrealized investment gains (losses) on fixed maturity securities, net of tax |  |  |  |
Beginning balance | 13.2 | 287.2 | 348.9 | 439.8
Change in net unrealized investment gains (losses) on fixed maturity securities | (308.7) | 116.9 | (658.5) | (42.1)
Reclassification of net investment (gains) losses on fixed maturity securities to net income (loss) | 12.3 | (4.7) | 26.4 | 1.7
Ending balance | $ (283.2) | $ 399.4 | $ (283.2) | $ 399.4

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- Definition Amount, after tax and adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669646-108580 + Details
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