Condensed Consolidated Balance Sheets (Parenthetical) - € / shares	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Ordinary shares, nominal value	€ 0.01	€ 0.01
Ordinary shares, shares authorized	1,200,000,000	1,200,000,000

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_CommonStockSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant