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Commitments, Contingencies and Other Items (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($)
Commitments and Contingencies [Line Items] |
Initial commitments | $ 1,200,000,000
Fulfilled commitments | 686,400,000
Unfunded commitments | $ 470,800,000
Initial capital lease term | 20 years
Bargain renewal option term | 30 years
Letter of Credit |
Commitments and Contingencies [Line Items] |
Letters of credit outstanding | $ 510,600,000
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
Investments as a Percentage of Shareholders' Equity |
Commitments and Contingencies [Line Items] |
Concentration risk percentage | 10.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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