Debt and Other Obligations - Local Bank Loans and Other Short Term Borrowings (Details)	6 Months Ended	9 Months Ended
	Jun. 30, 2020 EUR (€) facility	Sep. 30, 2020 USD ($)	Sep. 30, 2020 EUR (€)	Dec. 31, 2019 USD ($)	Apr. 02, 2019 EUR (€)	Apr. 01, 2019 EUR (€)	May 05, 2017 EUR (€)	Jul. 25, 2014 EUR (€)
Debt Instrument [Line Items]
Other short-term debt and obligations		$ 116,670,000		$ 29,762,000
Line of Credit | Korea
Debt Instrument [Line Items]
Other short-term debt and obligations		40,600,000
Line of Credit | Brazil
Debt Instrument [Line Items]
Other short-term debt and obligations		1,400,000
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity | €					€ 250,000,000.0	€ 75,000,000.0	€ 175,000,000.0	€ 115,000,000.0
Amount outstanding		0
Total Ancillary Facilities
Debt Instrument [Line Items]
Amount outstanding		74,600,000		$ 28,600,000
RCF Bank Group | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 293,000,000	€ 250,000,000
RCF Bank Group | Total Ancillary Facilities
Debt Instrument [Line Items]
Maximum borrowing capacity | €	€ 170,000,000
RCF Bank Group | Ancillary Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity | €	€ 40,000,000
Number of ancillary facilities | facility	2
Revolver capacity percentage		68.00%