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Investments - Realized Investment Gains (Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019
Gain (Loss) on Securities |  |  |  |  |
Net investment gains (losses) |  | $ (11.0) | $ (2.3) | $ 153.3 |
Investment gain realized on transfer | $ 135.3 |  |  |  |
Reinsurance block of in-force fixed and variable annuity business |  | 3,200.0 |  | 2,900.0 | $ 2,900.0
Fixed maturity securities |  |  |  |  |
Gain (Loss) on Securities |  |  |  |  |
Net investment gains (losses) |  | (7.7) | 9.4 | 141.4 |
Equity securities |  |  |  |  |
Gain (Loss) on Securities |  |  |  |  |
Net investment gains (losses) |  | (0.8) | 1.8 | 16.0 |
Short-term and other investments |  |  |  |  |
Gain (Loss) on Securities |  |  |  |  |
Net investment gains (losses) |  | $ (2.5) | $ (13.5) | $ (4.1) |

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- Definition Amount of realized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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- Definition Amount before valuation allowance recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953401-111524 + Details
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