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Debt and Finance Lease Obligations (Senior Notes) (Details)	3 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($)	Dec. 31, 2020	Sep. 14, 2020 USD ($)	Dec. 31, 2019	Mar. 17, 2015 EUR (€)	Nov. 01, 2013 USD ($)	Sep. 11, 2012 USD ($)
2030 USD Senior notes
Debt Instrument [Line Items]
Debt instrument, face amount			$ 500,000,000.0
Interest rate (as a percentage)		3.50%	3.50%	3.50%
Price of senior notes, stated as percentage of principal amount			99.656%
Basis points increase over Treasury Rate upon redemption		0.0045
2022 EUR Senior notes
Debt Instrument [Line Items]
Debt instrument, face amount | €					€ 500,000,000.0
Interest rate (as a percentage)		1.25%		1.25%	1.25%
Price of senior notes, stated as percentage of principal amount					99.336%
Proceeds from (Repayments of) Long-term Debt and Capital Securities	$ 191,400,000
Loss on extinguishment	$ 1,200,000
Redemption price, states as percentage of principal amount		100.00%
Basis points increase over Treasury Rate upon redemption		0.0025
Redemption price, percentage of principal amount redeemed		100.00%
2023 Senior notes
Debt Instrument [Line Items]
Debt instrument, face amount						$ 300,000,000.0
Interest rate (as a percentage)		4.00%		4.00%		4.00%
Price of senior notes, stated as percentage of principal amount						99.532%
Basis points increase over Treasury Rate upon redemption		0.0025
2022 Senior notes
Debt Instrument [Line Items]
Debt instrument, face amount							$ 500,000,000.0
Interest rate (as a percentage)		3.50%		3.50%			3.50%
Price of senior notes, stated as percentage of principal amount							99.615%
Redemption price, states as percentage of principal amount		100.00%
Basis points increase over Treasury Rate upon redemption		0.0030

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