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Mortgage Loans, Allowance for Credit Losses Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Financing Receivable, Allowance for Credit Loss Rollforward, Mortgage Loans |  |
Write-offs | $ 0.0 | $ 0.0
Commercial Real Estate |  |
Financing Receivable, Allowance for Credit Loss Rollforward, Mortgage Loans |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 9.3 |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 10.0 |
Commercial Real Estate | Loan to Value Ratio Below or Equal to 65 Percent |  |
Financing Receivable, Allowance for Credit Loss Rollforward, Mortgage Loans |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 3.0 | 2.6
Current Period Provisions | 0.0 | (0.2)
Write-offs | 0.0 | 0.0
Recoveries | 0.0 | 0.0
Financing Receivable, Allowance for Credit Loss, Ending Balance | 3.0 | 2.4
Commercial Real Estate | Loan To Value Ratio Above 65 To 75 Percent |  |
Financing Receivable, Allowance for Credit Loss Rollforward, Mortgage Loans |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 4.7 | 4.7
Current Period Provisions | 0.6 | (0.2)
Write-offs | 0.0 | 0.0
Recoveries | 0.0 | 0.0
Financing Receivable, Allowance for Credit Loss, Ending Balance | 5.3 | 4.5
Commercial Real Estate | Loan To Value Ratio Above 75 To 85 Percent |  |
Financing Receivable, Allowance for Credit Loss Rollforward, Mortgage Loans |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 1.1 | 0.7
Current Period Provisions | 0.1 | 0.0
Write-offs | 0.0 | 0.0
Recoveries | 0.0 | 0.0
Financing Receivable, Allowance for Credit Loss, Ending Balance | 1.2 | 0.7
Commercial Real Estate | Loan To Value Ratio Above 85 Percent |  |
Financing Receivable, Allowance for Credit Loss Rollforward, Mortgage Loans |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 0.5 | 0.3
Current Period Provisions | 0.0 | 0.0
Write-offs | 0.0 | 0.0
Recoveries | 0.0 | 0.0
Financing Receivable, Allowance for Credit Loss, Ending Balance | 0.5 | 0.3
Commercial Real Estate | Loan to Value Ratio Total |  |
Financing Receivable, Allowance for Credit Loss Rollforward, Mortgage Loans |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 9.3 | 8.3
Current Period Provisions | 0.7 | (0.4)
Write-offs | 0.0 | 0.0
Recoveries | 0.0 | 0.0
Financing Receivable, Allowance for Credit Loss, Ending Balance | $ 10.0 | $ 7.9

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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) -Publisher SEC Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (c) -Publisher SEC Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(1) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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