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Investments - Allowance for Credit Loss (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Rollforward of the allowance for credit loss by major security type |  |
Beginning balance | $ 15.5 | $ 7.4
Additions for credit losses not previously recorded | 1.0 | 0.3
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period | 3.0 | 2.8
Foreign currency translation adjustment | 0.9 |
Ending balance | 20.4 | 10.5
Corporate debt securities |  |
Rollforward of the allowance for credit loss by major security type |  |
Beginning balance | 15.1 | 0.9
Additions for credit losses not previously recorded | 1.0 |
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period | 3.0 |
Foreign currency translation adjustment | 0.9 |
Ending balance | 20.0 | 0.9
Commercial mortgage-backed securities |  |
Rollforward of the allowance for credit loss by major security type |  |
Beginning balance | 0.3 | 4.3
Additions for credit losses not previously recorded |  | 0.3
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period |  | 2.4
Ending balance | 0.3 | 7.0
Collateralized debt obligations |  |
Rollforward of the allowance for credit loss by major security type |  |
Beginning balance |  | 2.2
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period |  | 0.4
Ending balance |  | $ 2.6
Other debt obligations |  |
Rollforward of the allowance for credit loss by major security type |  |
Beginning balance | 0.1 |
Ending balance | $ 0.1 |

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- Definition Amount of increase (decrease) in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from foreign currency translation adjustment. + References No definition available. + Details
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- Definition Amount of expense for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), for which no credit loss was previously recorded. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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- Definition Amount of expense (reversal of expense) for allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis, with previously recorded allowance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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- Definition Amount excluding accrued interest, of allowance for credit loss 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 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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