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Subsequent Events - Senior Notes Offerings (Details)				12 Months Ended
	Feb. 13, 2017 EUR (€)	Feb. 13, 2017 EUR (€)	Feb. 13, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Feb. 13, 2017 USD ($)	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 USD ($)	Sep. 09, 2013	Mar. 23, 2012
Subsequent Event [Line Items]
Proceeds from issuance of long-term debt				$ 0	$ 7,538,000	$ 733,629,000
5½% Senior Notes [Member]
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage										5.50%
5% Senior Notes [Member]
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage											5.00%
Four and Three Quarters Percent Senior Notes due 2025 [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.75%	4.75%					4.75%
Debt Instrument, Face Amount							$ 300,000,000
Redemption Price Percent If Change In Control Occurs in Addition to Accrued and Unpaid Interest	101.00%	101.00%					101.00%
Proceeds from issuance of long-term debt			$ 296,200,000
Four and Three Quarters Percent Senior Notes due 2025 [Member] | After March 15, 2020 | Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Redemption Price, Percentage in Addition to Accrued and Unpaid Interest		102.375%	102.375%
Four and Three Quarters Percent Senior Notes due 2025 [Member] | After March 15, 2022 | Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Redemption Price in Addition to Accrued and Unpaid Interest		100.00%	100.00%
Four and Three Quarters Percent Senior Notes due 2025 [Member] | Prior to March 15, 2020 | Subsequent Event [Member]
Subsequent Event [Line Items]
Maximum Redemption Percent Allowed And Limited To Proceeds From Equity Offering	35.00%	35.00%					35.00%
Debt Redemption Price Percent Of Principal Amount in Addition to Accured and Unpaid Interest	104.75%	104.75%					104.75%
Debt Instrument, Redemption Price, Percentage in Addition to a Make-Whole Premium		100.00%	100.00%
Three and One Quarter Percent Senior Notes due 2025 [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.25%	3.25%					3.25%
Debt Instrument, Face Amount | €	€ 650,000,000	€ 650,000,000
Redemption Price Percent If Change In Control Occurs in Addition to Accrued and Unpaid Interest	101.00%	101.00%					101.00%
Proceeds from issuance of long-term debt | €		€ 643,200,000
Three and One Quarter Percent Senior Notes due 2025 [Member] | After March 15, 2020 | Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Redemption Price, Percentage in Addition to Accrued and Unpaid Interest		101.625%	101.625%
Three and One Quarter Percent Senior Notes due 2025 [Member] | After March 15, 2022 | Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Redemption Price in Addition to Accrued and Unpaid Interest		100.00%	100.00%
Three and One Quarter Percent Senior Notes due 2025 [Member] | Prior to March 15, 2020 | Subsequent Event [Member]
Subsequent Event [Line Items]
Maximum Redemption Percent Allowed And Limited To Proceeds From Equity Offering	35.00%	35.00%					35.00%
Debt Redemption Price Percent Of Principal Amount in Addition to Accured and Unpaid Interest	103.25%	103.25%					103.25%
Debt Instrument, Redemption Price, Percentage in Addition to a Make-Whole Premium	100.00%
Bank Borrowings [Member] | U.S. term loans [Member]
Subsequent Event [Line Items]
Aggregate Maturities of Prepaid Loans Extended to 2025									$ 212,300,000
Current Maturities Classified as Long-Term Debt									36,500,000
Bank Borrowings [Member] | Euro term loans [Member]
Subsequent Event [Line Items]
Aggregate Maturities of Prepaid Loans Extended to 2025 | €								€ 187,000,000
Bank Borrowings [Member] | U S Term and Euro Term Loans [Member]
Subsequent Event [Line Items]
Aggregate Maturities of Prepaid Loans Extended to 2025									408,900,000
Short-term Debt [Member] | Euro term loans [Member]
Subsequent Event [Line Items]
Current Maturities Classified as Long-Term Debt | €								€ 22,000,000
Short-term Debt [Member] | U S Term and Euro Term Loans [Member]
Subsequent Event [Line Items]
Current Maturities Classified as Long-Term Debt									$ 59,600,000

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