Accounts Receivable Securitization Programs (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) bank	Sep. 30, 2016 USD ($)	Sep. 30, 2017 EUR (€)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items]
Interest expense	$ 54,000,000	$ 49,600,000	$ 153,700,000	$ 151,400,000
U.S. Accounts Receivable Securitization Program
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items]
Interest expense	$ 600,000	$ 400,000	$ 1,000,000	$ 1,100,000
U.S. Accounts Receivable Securitization Program | U.S. Program
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items]
Number of banks involved in sale of fractional ownership interest of accounts receivable | bank			2
Level of eligible assets available under accounts receivable securitization program			$ 60,000,000
Amount available for accounts receivable securitization program						$ 60,000,000
Amount utilized under accounts receivable securitization program						0	$ 0
U.S. Accounts Receivable Securitization Program | Maximum | U.S. Program
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items]
Maximum purchase limit for receivable interests under accounts receivable securitization program						60,000,000
European Accounts Receivable Securitization Program | European Program
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items]
Amount available for accounts receivable securitization program					€ 79,200,000	93,300,000
European Accounts Receivable Securitization Program | Maximum | European Program
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items]
Maximum purchase limit for receivable interests under accounts receivable securitization program					€ 80,000,000	$ 94,300,000