Accounts Receivable Securitization Programs (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) bank	Mar. 31, 2018 USD ($)	Mar. 31, 2019 EUR (€)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 EUR (€)	Dec. 31, 2018 USD ($)
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items]
Amounts available under under program				$ 72,900,000		$ 249,800,000
Interest paid	$ 44,900,000	$ 42,000,000
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
Amounts available under under 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]
Amounts available under under program			€ 68,200,000	76,600,000
Amount utilized under accounts receivable securitization program			66,900,000	75,000,000	€ 73,300,000	$ 83,900,000
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	$ 89,800,000
Accounts Receivable Securitization Programs
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items]
Interest paid	$ 200,000