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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	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Executive Vice President
Related Party Transactions [Line Items]
Ownership percentage in third party by executive	40.00%
Inventory Purchases \| Supplier Concentration Risk \| Affiliated Entity
Related Party Transactions [Line Items]
Inventory purchases form related party supplier	$ 1.1	$ 5.2	$ 6.4