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Investments - Mortgage Loan Valuation Allowance (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Changes in financing receivable valuation allowance |  |  |  |  |
Beginning balance, Financing receivable valuation allowance | $ 42.7 | $ 48.7 | $ 52.9 | $ 33.1 |
Provision: Financing receivable valuation allowance | (3.4) | 1.4 | (14.9) | 16.0 |
Charge-offs: Financing receivable valuation allowance | (0.2) | (0.1) | (0.5) | (0.3) |
Recoveries: Financing receivable valuation allowance | 1.0 | 0.6 | 2.7 | 1.8 |
Effect of exchange rates: Financing receivable valuation allowance | (0.1) |  | (0.2) |  |
Ending balance, Financing receivable valuation allowance | 40.0 | 50.6 | 40.0 | 50.6 |
Financing receivables, Total amortized cost | 20,086.4 |  | $ 20,086.4 |  | $ 18,103.9
Commercial mortgage loans |  |  |  |  |
Financing receivable valuation allowance disclosures |  |  |  |  |
Mortgage loans, Days delinquent to be analyzed for valuation allowance |  |  | 60 days |  |
Changes in financing receivable valuation allowance |  |  |  |  |
Beginning balance, Financing receivable valuation allowance | 36.6 | 40.4 | $ 43.2 | 27.3 |
Provision: Financing receivable valuation allowance | (2.1) | 1.7 | (8.6) | 14.8 |
Effect of exchange rates: Financing receivable valuation allowance | (0.1) |  | (0.2) |  |
Ending balance, Financing receivable valuation allowance | 34.4 | 42.1 | 34.4 | 42.1 |
Financing receivables, Total amortized cost | 16,332.6 |  | 16,332.6 |  | 15,441.6
Direct financing leases |  |  |  |  |
Changes in financing receivable valuation allowance |  |  |  |  |
Beginning balance, Financing receivable valuation allowance | 0.3 | 0.2 | 0.1 |  |
Provision: Financing receivable valuation allowance |  | (0.1) | 0.2 | 0.1 |
Ending balance, Financing receivable valuation allowance | 0.3 | 0.1 | 0.3 | 0.1 |
Financing receivables, Total amortized cost | 623.4 |  | $ 623.4 |  | 710.8
Residential mortgage loans |  |  |  |  |
Financing receivable valuation allowance disclosures |  |  |  |  |
Mortgage loans, Days delinquent to be analyzed for valuation allowance |  |  | 60 days |  |
Changes in financing receivable valuation allowance |  |  |  |  |
Beginning balance, Financing receivable valuation allowance | 3.2 | 5.6 | $ 6.9 | 3.3 |
Provision: Financing receivable valuation allowance | (1.4) | (0.3) | (6.5) | 1.0 |
Charge-offs: Financing receivable valuation allowance | (0.2) | (0.1) | (0.5) | (0.3) |
Recoveries: Financing receivable valuation allowance | 1.0 | 0.6 | 2.7 | 1.8 |
Ending balance, Financing receivable valuation allowance | 2.6 | 5.8 | 2.6 | 5.8 |
Financing receivables, Total amortized cost | 3,130.4 |  | 3,130.4 |  | $ 1,951.5
Reinsurance recoverables |  |  |  |  |
Changes in financing receivable valuation allowance |  |  |  |  |
Beginning balance, Financing receivable valuation allowance | 2.6 | 2.5 | 2.7 | 2.5 |
Provision: Financing receivable valuation allowance | 0.1 | 0.1 |  | 0.1 |
Ending balance, Financing receivable valuation allowance | $ 2.7 | $ 2.6 | $ 2.7 | $ 2.6 |

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