Accounts Receivable Securitization Programs (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) bank	Jun. 30, 2018 USD ($)	Jun. 30, 2019 EUR (€)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items]
Amounts available under under program	$ 157,400,000		$ 157,400,000			$ 249,800,000
Interest paid	43,200,000	$ 44,500,000	$ 88,100,000	$ 86,500,000
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			$ 60,000,000.0
Amounts available under under program	57,400,000		57,400,000
Amount utilized under accounts receivable securitization program	0		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	60,000,000.0		60,000,000.0
European Accounts Receivable Securitization Program | European Program
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items]
Amounts available under under program	79,600,000		79,600,000		€ 70,000,000.0
Amount utilized under accounts receivable securitization program	78,500,000		78,500,000		69,000,000.0	$ 83,900,000	€ 73,300,000
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	91,000,000.0		91,000,000.0		€ 80,000,000.0
Accounts Receivable Securitization Programs
Qualitative And Quantitative Information Transferors Continuing Involvement [Line Items]
Interest paid	$ 200,000	$ 200,000	$ 400,000	$ 200,000