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Investments - Mortgage Loan Valuation Allowance (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Changes in financing receivable valuation allowance |  |  |  |  |
Beginning balance, Financing receivable valuation allowance | $ 49.8 | $ 46.5 | $ 52.9 | $ 33.1 |
Provision: Financing receivable valuation allowance | (7.5) | 1.7 | (11.5) | 14.6 |
Charge-offs: Financing receivable valuation allowance | (0.2) | (0.1) | (0.3) | (0.2) |
Recoveries: Financing receivable valuation allowance | 0.7 | 0.6 | 1.7 | 1.2 |
Effect of exchange rates: Financing receivable valuation allowance | (0.1) |  | (0.1) |  |
Ending balance, Financing receivable valuation allowance | 42.7 | 48.7 | 42.7 | 48.7 |
Financing receivables, Total amortized cost | 19,153.6 |  | $ 19,153.6 |  | $ 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 | 43.1 | 37.7 | $ 43.2 | 27.3 |
Provision: Financing receivable valuation allowance | (6.4) | 2.7 | (6.5) | 13.1 |
Effect of exchange rates: Financing receivable valuation allowance | (0.1) |  | (0.1) |  |
Ending balance, Financing receivable valuation allowance | 36.6 | 40.4 | 36.6 | 40.4 |
Financing receivables, Total amortized cost | 16,161.5 |  | 16,161.5 |  | 15,441.6
Direct financing leases |  |  |  |  |
Changes in financing receivable valuation allowance |  |  |  |  |
Beginning balance, Financing receivable valuation allowance | 0.1 | 0.2 | 0.1 |  |
Provision: Financing receivable valuation allowance | 0.2 |  | 0.2 | 0.2 |
Ending balance, Financing receivable valuation allowance | 0.3 | 0.2 | 0.3 | 0.2 |
Financing receivables, Total amortized cost | 694.0 |  | $ 694.0 |  | 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 | 3.9 | 6.1 | $ 6.9 | 3.3 |
Provision: Financing receivable valuation allowance | (1.2) | (1.0) | (5.1) | 1.3 |
Charge-offs: Financing receivable valuation allowance | (0.2) | (0.1) | (0.3) | (0.2) |
Recoveries: Financing receivable valuation allowance | 0.7 | 0.6 | 1.7 | 1.2 |
Ending balance, Financing receivable valuation allowance | 3.2 | 5.6 | 3.2 | 5.6 |
Financing receivables, Total amortized cost | 2,298.1 |  | 2,298.1 |  | $ 1,951.5
Reinsurance recoverables |  |  |  |  |
Changes in financing receivable valuation allowance |  |  |  |  |
Beginning balance, Financing receivable valuation allowance | 2.7 | 2.5 | 2.7 | 2.5 |
Provision: Financing receivable valuation allowance | (0.1) |  | (0.1) |  |
Ending balance, Financing receivable valuation allowance | $ 2.6 | $ 2.5 | $ 2.6 | $ 2.5 |

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