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Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Inventories, Net and Significant Suppliers - Related Party Supplier (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Executive Vice President
Related Party Transaction [Line Items]
Ownership percentage in third party by executive		40.00%
Related Party Supplier \| Supplier Concentration Risk \| Inventory Purchases
Related Party Transaction [Line Items]
Inventory purchases	$ 1.6	$ 1.1	$ 2.6