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Debt (Details) € in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
Debt (Details) € in Thousands, $ in Thousands	Jun. 30, 2020 USD ($) Rate	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) Rate	Jun. 30, 2019 USD ($)	Jun. 30, 2020 EUR (€) Rate	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 764,553		$ 764,553
Unamortized Debt Issuance Expense	(2,156)		(2,156)
Line of Credit Facility, Fair Value of Amount Outstanding	381,077		381,077
Total debt	1,200,175		1,200,175
Debt, Current	(53,585)		(53,585)
Long-term Debt	1,146,590		$ 1,146,590
Debt Instrument, Term			15 years
Line of Credit Facility, Remaining Borrowing Capacity	712,100		$ 712,100
Cash and Cash Equivalents, at Carrying Value	127,277		127,277			$ 207,785	$ 178,110	$ 124,439
Gain (Loss) on Derivative Used in Net Investment Hedge, after Tax	2,100	$ 1,300	100	$ (1,000)
Cumulative (gain) loss in other other comprehensive income related to the change in a net investment hedge.	1,600		1,600
Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	473,949		473,949
Unamortized Debt Issuance Expense	(1,051)		(1,051)
Line of Credit Facility, Fair Value of Amount Outstanding	299,997		299,997
Total debt	776,669		776,669
Debt, Current	(1,763)		(1,763)
Long-term Debt	774,906		774,906
Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	290,604		290,604
Unamortized Debt Issuance Expense	(1,105)		(1,105)
Line of Credit Facility, Fair Value of Amount Outstanding	81,080		81,080
Total debt	423,506		423,506
Debt, Current	(51,822)		(51,822)
Long-term Debt	$ 371,684		$ 371,684
3.67% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	3.67%		3.67%		3.67%
Debt Instrument, Maturity Date			Dec. 17, 2022
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 50,000		$ 50,000
Debt Instrument, Term			10 years
3.67% Senior Notes [Member] \| Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	50,000		$ 50,000
3.67% Senior Notes [Member] \| Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 0		$ 0
4.10% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	4.10%		4.10%		4.10%
Debt Instrument, Maturity Date			Sep. 19, 2023
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 50,000		$ 50,000
Debt Instrument, Term			10 years
4.10% Senior Notes [Member] \| Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	50,000		$ 50,000
4.10% Senior Notes [Member] \| Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 0		$ 0
3.84% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	3.84%		3.84%		3.84%
Debt Instrument, Maturity Date			Sep. 19, 2024
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 125,000		$ 125,000
Debt Instrument, Term			10 years
3.84% Senior Notes [Member] \| Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	125,000		$ 125,000
3.84% Senior Notes [Member] \| Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 0		$ 0
4.24% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	4.24%		4.24%		4.24%
Debt Instrument, Maturity Date			Jun. 25, 2025
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 125,000		$ 125,000
Debt Instrument, Term			10 years
4.24% Senior Notes [Member] \| Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	125,000		$ 125,000
4.24% Senior Notes [Member] \| Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 0		$ 0
3.91% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	3.91%		3.91%		3.91%
Debt Instrument, Maturity Date			Jun. 25, 2029
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 75,000		$ 75,000
Debt Instrument, Term			10 years
3.91% Senior Notes [Member] \| Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	75,000		$ 75,000
3.91% Senior Notes [Member] \| Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 0		$ 0
3.19% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	3.19%		3.19%		3.19%
Debt Instrument, Maturity Date			Jan. 24, 2035
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 50,000		$ 50,000
3.19% Senior Notes [Member] \| Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	50,000		50,000
3.19% Senior Notes [Member] \| Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 0		$ 0
1.47% EURO Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	1.47%		1.47%		1.47%
Euro Notes - USD Amount	$ 140,245		$ 140,245
Debt Instrument, Maturity Date			Jun. 17, 2030
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes \| €					€ 125,000
Debt Instrument, Term			15 years
1.47% EURO Senior Notes [Member] \| Us Dollar Amounts Member
Debt Instrument [Line Items]
Euro Notes - USD Amount	0		$ 0
1.47% EURO Senior Notes [Member] \| Other Principal Trading Currencies [Member]
Debt Instrument [Line Items]
Euro Notes - USD Amount	$ 140,245		$ 140,245
1.30% Euro-Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	1.30%		1.30%		1.30%
Euro Notes - USD Amount	$ 151,464		$ 151,464
Debt Instrument, Maturity Date			Nov. 06, 2034
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes \| €					€ 135
Debt Instrument, Term			15 years
1.30% Euro-Senior Notes [Member] \| Us Dollar Amounts Member
Debt Instrument [Line Items]
Euro Notes - USD Amount	0		$ 0
1.30% Euro-Senior Notes [Member] \| Other Principal Trading Currencies [Member]
Debt Instrument [Line Items]
Euro Notes - USD Amount	$ 151,464		$ 151,464
Credit facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	0.975%		0.975%		0.975%
Debt Instrument, Maturity Date			Jun. 15, 2023
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 1,100,000		$ 1,100,000
Other local arrangements [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Other Borrowings	54,545		54,545
Other local arrangements [Member] \| Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Other Borrowings	2,723		2,723
Other local arrangements [Member] \| Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Other Borrowings	$ 51,822		$ 51,822
Swiss Pension Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	8750.00%		8750.00%		8750.00%
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Loan from Swiss Pension Plan USD Amount	$ 39,600		$ 39,600
Swiss Pension Loans (local currency)	$ 38,000		$ 38,000