Debt Facilities Debt Facilities - Optional Redemption Schedule (Details) - Senior Notes [Member] - 2.875% Euro Senior Notes due 2025 [Member]	3 Months Ended
Mar. 31, 2018
Early Equity Redemption Price
Debt Instrument [Line Items]
Redemption price, percentage	102.875%
First Scheduled Redemption Price
Debt Instrument [Line Items]
Redemption price, percentage	101.438%
Second Year Redemption Price
Debt Instrument [Line Items]
Redemption price, percentage	100.719%
Third Year Redemption Price
Debt Instrument [Line Items]
Redemption price, percentage	100.00%

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration