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Investments - Allowance for Credit Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Rollforward of the allowance for credit loss by major security type |  |  |  |
Beginning balance | $ 10.5 | $ 7.6 | $ 7.4 |
Additions for credit losses not previously recorded | 7.6 | 4.1 | 7.9 | $ 11.7
Reductions for securities sold during the period |  | (7.0) |  | (7.0)
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period |  | 2.5 | 2.8 | 2.5
Write-offs charged against allowance | (9.4) |  | (9.4) |
Ending balance | 8.7 | 7.2 | 8.7 | 7.2
Accrued interest written off to net investment income | 0.2 |  | 0.2 |
Corporate debt securities |  |  |  |
Rollforward of the allowance for credit loss by major security type |  |  |  |
Beginning balance | 0.9 | 7.0 | 0.9 |
Additions for credit losses not previously recorded | 7.6 | 2.8 | 7.6 | 9.8
Reductions for securities sold during the period |  | (7.0) |  | (7.0)
Ending balance | 8.5 | 2.8 | 8.5 | 2.8
Accrued interest written off to net investment income | 0.2 |  | 0.2 |
Commercial mortgage-backed securities |  |  |  |
Rollforward of the allowance for credit loss by major security type |  |  |  |
Beginning balance | 7.0 | 0.4 | 4.3 |
Additions for credit losses not previously recorded |  | 1.3 | 0.3 | 1.7
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period |  | 1.7 | 2.4 | 1.7
Write-offs charged against allowance | (6.8) |  | (6.8) |
Ending balance | 0.2 | 3.4 | 0.2 | 3.4
Collateralized debt obligations |  |  |  |
Rollforward of the allowance for credit loss by major security type |  |  |  |
Beginning balance | 2.6 | 0.1 | 2.2 |
Additions for credit losses not previously recorded |  |  |  | 0.1
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period |  | 0.9 | 0.4 | 0.9
Write-offs charged against allowance | $ (2.6) |  | $ (2.6) |
Ending balance |  | 1.0 |  | 1.0
Other debt obligations |  |  |  |
Rollforward of the allowance for credit loss by major security type |  |  |  |
Beginning balance |  | 0.1 |  |
Additions for credit losses not previously recorded |  |  |  | 0.1
Additional increases (decreases) for credit losses on securities with an allowance recorded in the previous period |  | $ (0.1) |  | $ (0.1)

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 3D -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL120267862-210455 + Details
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- Definition Amount 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 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 4: 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=121558606&loc=SL82898722-210454 + 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=121582814&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=121582814&loc=SL82922900-210455 + Details
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- Definition Amount 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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 + Details
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