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Investments - Allowance for Credit Losses (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Beginning of the Year | $ (9.6) | $ 7.5
Additions for Securities for which No Previous Expected Credit Losses were Recognized | 0.7 | (3.8)
Reduction Due to Sales | (1.9) |
Net Decrease in Allowance on Securities for which Expected Credit Losses were Previously Recognized | (1.0) | (5.8)
Debt Securities, Available-for-Sale, Allowance for Credit Loss | (7.1) | 13.6
Debt Securities, Available-for-sale, Allowance for Credit Loss, Writeoff | (0.3) | (3.5)
Foreign Governments |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Beginning of the Year | 0.0 |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0.0 |
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Beginning of the Year | (8.9) | 7.5
Additions for Securities for which No Previous Expected Credit Losses were Recognized | 0.7 | (3.8)
Reduction Due to Sales | (1.9) |
Net Decrease in Allowance on Securities for which Expected Credit Losses were Previously Recognized | (1.0) | (5.8)
Debt Securities, Available-for-Sale, Allowance for Credit Loss | (6.7) | 13.6
Debt Securities, Available-for-sale, Allowance for Credit Loss, Writeoff | 0.0 | $ (3.5)
States and Political Subdivisions |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward] |  |
Beginning of the Year | (0.7) |
Additions for Securities for which No Previous Expected Credit Losses were Recognized | 0.0 |
Reduction Due to Sales | 0.0 |
Net Decrease in Allowance on Securities for which Expected Credit Losses were Previously Recognized | 0.0 |
Debt Securities, Available-for-Sale, Allowance for Credit Loss | (0.4) |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Writeoff | $ (0.3) |

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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 -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + 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 -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 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 -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 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 of writeoff 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 50 -Paragraph 9 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-9 + Details
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