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Investments - Net Unrealized Investment Gains and Losses on Fixed Maturities and Equity Securities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax |  |  |
Beginning balance | $ 1,790.1 | $ 1,567.3 |
Ending balance | 1,807.4 | 1,790.1 | $ 1,567.3
Net unrealized investment gains (losses) on securities |  |  |
AOCI Attributable to Parent, Net of Tax |  |  |
Beginning balance | 366.3 | 230.4 | 96.9
Ending balance | 290.7 | 366.3 | 230.4
Net unrealized investment gains (losses) on securities | Fixed maturity securities |  |  |
AOCI Attributable to Parent, Net of Tax |  |  |
Beginning balance | 439.8 | 264.4 | 111.7
Change in net unrealized investment (losses) gains on fixed maturity securities | (97.6) | 184.2 | 277.1
Reclassification of net investment losses (gains) on fixed maturity securities to net income | 6.7 | (8.8) | (124.4)
Ending balance | $ 348.9 | $ 439.8 | $ 264.4

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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 http://asc.fasb.org/extlink&oid=124509347&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 http://asc.fasb.org/extlink&oid=124509347&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 http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580 + Details
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