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Debt - ST Debt (Details) - USD ($) $ in Thousands	12 Months Ended
Debt - ST Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2018	Dec. 31, 2019
Short-term Debt [Line Items]
Debt, Current	$ 158,633		$ 331,431
Lines of Credit [Member]
Short-term Debt [Line Items]
Lines of Credit Facility, Maximum Borrowing Capacity	200,000
Debt, Current	$ 0		$ 60,000
Short-term Debt, Weighted Average Interest Rate, at Point in Time	1.53%		2.61%
6.00% Notes, Due 2020 [Member]
Short-term Debt [Line Items]
Debt, Current	$ 0		$ 209,322
Debt Instrument, Interest Rate, Stated Percentage	6.00%		6.00%
Redemption of notes	$ (209,366)
Notes Due in 2018 [Member]
Short-term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.00%
Redemption of notes		$ (300,000)
5.125% Notes, Due 2021 [Member]
Short-term Debt [Line Items]
Debt, Current	$ 130,836		$ 0
Debt Instrument, Interest Rate, Stated Percentage	5.125%
Short-term borrowings in various countries [Member]
Short-term Debt [Line Items]
Debt, Current	$ 27,797		$ 62,109
Short-term Debt, Weighted Average Interest Rate, at Point in Time	1.73%		2.76%
Commercial Paper [Member]
Short-term Debt [Line Items]
Lines of Credit Facility, Maximum Borrowing Capacity	$ 1,200,000
Short-term Debt, Weighted Average Interest Rate, at Point in Time	0.30%		2.24%