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Investments - Financing Receivable, Non-Accrual and Aging (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Non-accrual status | $ 10.8 | $ 21.5 | $ 11.8
Financing receivables, Non-accrual assets without a valuation allowance | 0.7 | 0.7 |
Financing receivables, Nonaccrual, Interest Income | 0.0 | 0.0 |
Financing receivables, Total amortized cost | 20,086.4 | 18,103.9 |
Recorded investment 90 days or more past due and accruing | 9.3 | 7.8 |
Reinsurance recoverables | 1,122.7 | 1,098.0 |
Current |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Total amortized cost | 20,020.5 | 17,951.1 |
Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Total amortized cost | 65.9 | 152.8 |
Reinsurance recoverables | 0.0 | 0.0 |
30 to 59 Days Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Total amortized cost | 40.1 | 108.7 |
60 to 89 Days Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Total amortized cost | 7.5 | 21.2 |
90 Days or More Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Total amortized cost | 18.3 | 22.9 |
Commercial mortgage loans |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Non-accrual status | 4.6 | 10.7 | 5.0
Financing receivables, Total amortized cost | 16,332.6 | 15,441.6 |
Recorded investment 90 days or more past due and accruing | 2.7 | 1.3 |
Commercial mortgage loans | Current |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Total amortized cost | 16,319.9 | 15,378.3 |
Commercial mortgage loans | Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Total amortized cost | 12.7 | 63.3 |
Commercial mortgage loans | 30 to 59 Days Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Total amortized cost | 5.3 | 42.1 |
Commercial mortgage loans | 60 to 89 Days Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Total amortized cost | 0.1 | 9.2 |
Commercial mortgage loans | 90 Days or More Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Total amortized cost | 7.3 | 12.0 |
Direct financing leases |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Total amortized cost | 623.4 | 710.8 |
Recorded investment 90 days or more past due and accruing | 3.6 |  |
Direct financing leases | Current |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Total amortized cost | 619.8 | 707.6 |
Direct financing leases | Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Total amortized cost | 3.6 | 3.2 |
Direct financing leases | 60 to 89 Days Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Total amortized cost |  | 3.2 |
Direct financing leases | 90 Days or More Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Total amortized cost | 3.6 |  |
Residential mortgage loans |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Non-accrual status | 6.2 | 10.8 | $ 6.8
Financing receivables, Non-accrual assets without a valuation allowance | 0.7 | 0.7 |
Financing receivables, Total amortized cost | 3,130.4 | 1,951.5 |
Recorded investment 90 days or more past due and accruing | 3.0 | 6.5 |
Residential mortgage loans | Current |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Total amortized cost | 3,080.8 | 1,865.2 |
Residential mortgage loans | Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Total amortized cost | 49.6 | 86.3 |
Residential mortgage loans | 30 to 59 Days Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Total amortized cost | 34.8 | 66.6 |
Residential mortgage loans | 60 to 89 Days Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Total amortized cost | 7.4 | 8.8 |
Residential mortgage loans | 90 Days or More Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Total amortized cost | $ 7.4 | $ 10.9 |

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