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Subsequent Events Subsequent Events - Narrative (Details) $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 02, 2020 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Subsequent Event [Line Items] |  |  |  |  |
Coverage |  |  | $ 2,319.8 | $ 2,077.6 | $ 1,515.2
Interest rate, compounded |  |  | 0.25 |  |
Enstar | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Coverage | $ 800.0 |  |  |  |
Second coverage | 300.0 |  |  |  |
Ceded premiums payable |  | $ 800.0 |  |  |
Interest rate, compounded |  | 0.0375 |  |  |
Enstar | Minimum | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Reinsurance retention policy, amount retained | 3,800.0 |  |  |  |
Enstar | Maximum | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Reinsurance retention policy, amount retained | 4,600.0 |  |  |  |
Reinsurance retention policy, second amount retained | $ 4,800.0 |  |  |  |

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- Definition Reinsurance Recoverables, Including Reinsurance Premium Paid, Second Tier + References No definition available. + Details
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- Definition Reinsurance Retention Policy, Amount Retained, Second Tier + References No definition available. + Details
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- Definition Related Party Transaction, Rate of Interest + References No definition available. + Details
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- Definition The consideration due to the assuming enterprise as of the balance sheet date under the terms of the reinsurance contract in exchange for the right to receive reimbursement from such entity for covered claims and expenses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.13(c)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),6) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21409-158489 + Details
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- Definition Stated amount that is the upper retention limit per entity policy. + References No definition available. + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Details
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