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Investments - Financing Receivable, Non-Accrual and Aging (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Non-accrual status | $ 68.6 | $ 67.8 | $ 17.2
Financing receivables, Non-accrual assets without a valuation allowance | 0.5 | 0.6 |
Financing receivables, Nonaccrual, Interest Income | 1.2 | 0.9 | 0.5
Direct financing leases, Total amortized cost | 650.1 | 665.0 |
Mortgage loans and direct financing leases, Total amortized cost | 21,097.0 | 21,378.3 |
Direct financing leases, Recorded investment 90 days or more past due and accruing |  | 1.6 |
Mortgage loans and direct financing leases, Recorded investment 90 days or more past due and accruing | 8.3 | 8.0 |
Reinsurance recoverable and deposit receivable | 20,614.9 | 21,445.4 |
30 to 59 Days Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Direct financing leases, Total amortized cost |  | 6.6 |
Mortgage loans and direct financing leases, Total amortized cost | 54.8 | 125.6 |
60 to 89 Days Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Direct financing leases, Total amortized cost | 4.1 | 6.2 |
Mortgage loans and direct financing leases, Total amortized cost | 21.0 | 29.1 |
90 Days or More Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Direct financing leases, Total amortized cost |  | 1.6 |
Mortgage loans and direct financing leases, Total amortized cost | 29.6 | 32.2 |
Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Direct financing leases, Total amortized cost | 4.1 | 14.4 |
Mortgage loans and direct financing leases, Total amortized cost | 105.4 | 186.9 |
Reinsurance recoverable and deposit receivable | 0.0 | 0.0 |
Current |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Direct financing leases, Total amortized cost | 646.0 | 650.6 |
Mortgage loans and direct financing leases, Total amortized cost | 20,991.6 | 21,191.4 |
Commercial mortgage loans |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Non-accrual status | 58.4 | 50.0 | 13.2
Financing receivables, Nonaccrual, Interest Income | 1.2 | 0.9 | 0.5
Mortgage loans, Total amortized cost | 16,581.8 | 16,730.3 |
Commercial mortgage loans | 30 to 59 Days Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Mortgage loans, Total amortized cost | 7.8 | 45.9 |
Commercial mortgage loans | 60 to 89 Days Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Mortgage loans, Total amortized cost | 0.8 | 7.5 |
Commercial mortgage loans | 90 Days or More Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Mortgage loans, Total amortized cost | 12.5 | 14.4 |
Commercial mortgage loans | Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Mortgage loans, Total amortized cost | 21.1 | 67.8 |
Commercial mortgage loans | Current |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Mortgage loans, Total amortized cost | 16,560.7 | 16,662.5 |
Residential mortgage loans |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Financing receivables, Non-accrual status | 10.2 | 17.8 | $ 4.0
Financing receivables, Non-accrual assets without a valuation allowance | 0.5 | 0.6 |
Mortgage loans, Total amortized cost | 3,696.5 | 3,983.0 |
Mortgage loans, Recorded investment 90 days or more past due and accruing | 7.7 | 6.4 |
Residential mortgage loans | 30 to 59 Days Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Mortgage loans, Total amortized cost | 46.0 | 73.1 |
Residential mortgage loans | 60 to 89 Days Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Mortgage loans, Total amortized cost | 15.6 | 15.4 |
Residential mortgage loans | 90 Days or More Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Mortgage loans, Total amortized cost | 16.4 | 16.2 |
Residential mortgage loans | Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Mortgage loans, Total amortized cost | 78.0 | 104.7 |
Residential mortgage loans | Current |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Mortgage loans, Total amortized cost | 3,618.5 | $ 3,878.3 |
Other loans |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Mortgage loans, Total amortized cost | 168.6 |  |
Mortgage loans, Recorded investment 90 days or more past due and accruing | 0.6 |  |
Other loans | 30 to 59 Days Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Mortgage loans, Total amortized cost | 1.0 |  |
Other loans | 60 to 89 Days Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Mortgage loans, Total amortized cost | 0.5 |  |
Other loans | 90 Days or More Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Mortgage loans, Total amortized cost | 0.7 |  |
Other loans | Past Due |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Mortgage loans, Total amortized cost | 2.2 |  |
Other loans | Current |  |  |
Financing receivables, non-accrual and aging disclosures |  |  |
Mortgage loans, Total amortized cost | $ 166.4 |  |

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