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Commitments, Contingencies and Other Items (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Commitments and Contingencies [Line Items] |  |
Initial commitments | $ 1,800,000,000 |
Fulfilled commitments | 809,000,000.0 |
Unfunded commitments | $ 1,000,000,000.0 |
Operating lease, weighted average lease term | 3 years 8 months 12 days |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:OtherAssets | us-gaap:OtherAssets
Operating Lease, Liability, Statement of Financial Position [Extensible List] | us-gaap:OtherLiabilities | us-gaap:OtherLiabilities
Operating lease, right-of-use asset | $ 29,800,000 | $ 42,800,000
Operating lease, liability | 29,900,000 | 42,900,000
Operating lease, expense | $ 9,800,000 | $ 8,500,000
Lessee, finance lease, term of contract | 20 years |
Lessee, finance lease, renewal term | 30 years |
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:OtherAssets | us-gaap:OtherAssets
Finance Lease, Liability, Statement of Financial Position [Extensible List] | us-gaap:OtherLiabilities | us-gaap:OtherLiabilities
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 | $ 18,000,000.0 | $ 19,800,000
Other liabilities |  |
Commitments and Contingencies [Line Items] |  |
Finance lease, liability | 22,900,000 | 25,100,000
Other income (loss) |  |
Commitments and Contingencies [Line Items] |  |
Finance lease, right-of-use asset, amortization | 500,000 | 900,000
Interest Expense |  |
Commitments and Contingencies [Line Items] |  |
Finance lease, interest expense | $ 2,300,000 | $ 2,600,000

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