Consolidated Statements of Stockholders' Equity (Deficit) (unaudited) (Parenthetical) $ in Millions	6 Months Ended
Jun. 30, 2018 USD ($)
Net change on derivatives designated as cash flow hedges, tax	$ 0.2
Accumulated other comprehensive (loss)
Net change on derivatives designated as cash flow hedges, tax	$ 0.2

Amount, after reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness, attributable to parent.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e640-108580

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