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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

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- Definition

Reinsurance Retention Policy, Amount Retained, Second Tier

+ References

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- Definition

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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))
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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

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-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

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- Definition

Stated amount that is the upper retention limit per entity policy.

+ References

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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.

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