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Debt Securities, Available-for-sale, Allowance for Credit Losses Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance |  |  | $ 0.0 |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance | $ 0.0 |  | 0.0 |
Public Utilities |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Beginning Balance | 0.0 | $ 4.1 | 0.0 | $ 0.0
Debt Securities, Available-for-sale, Credit losses on securities for which credit losses were not previously recorded | 0.0 | 0.0 | 0.0 | 4.1
Debt Securities, Available-for-sale, Allowance for Credit Loss, Ending Balance | $ 0.0 | $ 4.1 | $ 0.0 | $ 4.1

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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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