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v3.23.1

Investments - Allowance for Credit Loss (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Rollforward of the allowance for credit loss by major security type |  |
Beginning balance | $ 7.8 | $ 15.5
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 | (4.2) | 3.0
Foreign currency translation adjustment | 0.5 | 0.9
Ending balance | 4.1 | 20.4
Corporate debt securities |  |
Rollforward of the allowance for credit loss by major security type |  |
Beginning balance | 7.7 | 15.1
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 | (4.2) | 3.0
Foreign currency translation adjustment | 0.5 | 0.9
Ending balance | 4.0 | 20.0
Commercial mortgage-backed securities |  |
Rollforward of the allowance for credit loss by major security type |  |
Beginning balance |  | 0.3
Ending balance |  | 0.3
Other debt obligations |  |
Rollforward of the allowance for credit loss by major security type |  |
Beginning balance | 0.1 | 0.1
Ending balance | $ 0.1 | $ 0.1

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- Definition Amount of increase (decrease) in allowance for credit loss on investment in debt security excluding accrued interest 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 A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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 https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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- Definition Amount, excluding accrued interest, of credit loss expense on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with no credit loss 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 https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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- Definition Amount, excluding accrued interest, of credit loss expense (reversal of expense) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with previously recorded allowance and not intended to be sold and not more likely than not will be required to sell before recovery of amortized cost basis. + 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 https://asc.fasb.org/extlink&oid=124269663&loc=SL82922900-210455 + Details
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