Commitments and Contingencies - Business Interruption Insurance Proceeds (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
Jan. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Proceeds from insurance settlement	$ 49.0
Insurance proceeds — business interruption		$ 0.0	$ 0.0	$ (42.4)

The net amount (to the extent disclosed within this portion of the income statement) by which an insurance settlement exceeds incremental costs incurred from the event causing an interruption of business, plus the insurance award for earnings lost from the event, such as a natural catastrophe, explosion or fire.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=114868897&loc=SL114872001-224240

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration