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Commitments, Contingencies and Other Items (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Commitments and Contingencies [Line Items] |  |
Initial commitments | $ 1,100,000,000 |
Fulfilled commitments | 708,400,000 |
Unfunded commitments | $ 411,300,000 |
Operating lease, weighted average lease term | 4 years |
Operating lease, right-of-use asset | $ 42,800,000 |
Operating lease, liability | 42,900,000 |
Operating lease, expense | $ 8,500,000 |
Operating lease, expense |  | $ 6,100,000
Lessee, finance lease, term of contract | 20 years |
Lessee, finance lease, renewal term | 30 years |
Letter of Credit |  |
Commitments and Contingencies [Line Items] |  |
Letters of credit outstanding | $ 1,100,000,000 |
Letter of Credit | Top Layer Reinsurance Ltd. |  |
Commitments and Contingencies [Line Items] |  |
Collateral pledged to support letter of credit | 37,500,000 |
Letter of Credit | Capital Support Agreement | Top Layer Reinsurance Ltd. |  |
Commitments and Contingencies [Line Items] |  |
Maximum mandatory capital contribution in the event of loss that reduced capital and surplus below specified level | $ 50,000,000.0 |
Investments as a Percentage of Shareholders' Equity |  |
Commitments and Contingencies [Line Items] |  |
Concentration risk percentage | 10.00% |
Other assets |  |
Commitments and Contingencies [Line Items] |  |
Finance lease, right-of-use asset | $ 19,800,000 | 20,600,000
Other liabilities |  |
Commitments and Contingencies [Line Items] |  |
Finance lease, liability | 25,100,000 | 25,600,000
Other Income |  |
Commitments and Contingencies [Line Items] |  |
Finance lease, interest expense | 2,600,000 | 2,600,000
Finance lease, right-of-use asset, amortization | $ 900,000 | $ 900,000

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