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Investments - Allowance for Credit Loss (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Rollforward of the allowance for credit loss by major security type |  |  |
Beginning balance | $ 7.8 | $ 15.5 | $ 7.4
Additions for credit losses not previously recorded | 8.2 | 5.8 | 28.0
Reductions for securities sold during the period |  | (8.7) | (12.4)
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period | (7.5) | (4.2) | 2.8
Write-offs charged against allowance | (3.8) | (0.3) | (9.4)
Foreign currency translation adjustment |  | (0.3) | (0.9)
Ending balance | 4.7 | 7.8 | 15.5
Accrued interest written off to net investment income | 0.1 |  | 0.2
Corporate debt securities |  |  |
Rollforward of the allowance for credit loss by major security type |  |  |
Beginning balance | 7.7 | 15.1 | 0.9
Additions for credit losses not previously recorded | 8.2 | 5.8 | 27.5
Reductions for securities sold during the period |  | (8.7) | (12.4)
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period | (7.5) | (4.2) |
Write-offs charged against allowance | (3.8) |  |
Foreign currency translation adjustment |  | (0.3) | (0.9)
Ending balance | 4.6 | 7.7 | 15.1
Accrued interest written off to net investment income | 0.1 |  | 0.2
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 |  |  | 0.4
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period |  |  | 2.4
Write-offs charged against allowance |  | (0.3) | (6.8)
Ending balance |  |  | 0.3
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
Write-offs charged against allowance |  |  | (2.6)
Other debt obligations |  |  |
Rollforward of the allowance for credit loss by major security type |  |  |
Beginning balance | 0.1 | 0.1 |
Additions for credit losses not previously recorded |  |  | 0.1
Ending balance | $ 0.1 | $ 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 Amount of writeoff of accrued interest on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized by reversing interest income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 3D -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-3D + 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 -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + 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 -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + 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 -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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- Definition Amount, excluding accrued interest, of 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 sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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- Definition Amount, excluding accrued interest, of 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 writeoff. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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