Financing Arrangements and Derivative Financial Instruments - €550 million Amended and Restated Senior Secured European Revolving Credit Facility due 2020 (Details) - Line of Credit - European Revolving Credit Facility	9 Months Ended
	Sep. 30, 2017 EUR (€)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	€ 550,000,000
Annual commitment fee on undrawn amounts	0.30%
Amount outstanding | $			$ 0
Revolving Credit Facility | LIBOR
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	1.75%
Revolving Credit Facility | EURIBOR
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	1.75%
German Tranche
Line of Credit Facility [Line Items]
Maximum borrowing capacity	€ 125,000,000
Amount outstanding	125,000,000	$ 148,000,000
All-borrower Tranche
Line of Credit Facility [Line Items]
Maximum borrowing capacity	425,000,000
Amount outstanding	205,000,000	242,000,000
Swingline Loan
Line of Credit Facility [Line Items]
Maximum borrowing capacity	150,000,000
Letter of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	€ 50,000,000
Letters of credit outstanding | $		$ 0	$ 0