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Debt (Details) € in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
Debt (Details) € in Thousands, $ in Thousands	Sep. 30, 2021 USD ($) Rate	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) Rate	Sep. 30, 2020 USD ($)	Sep. 30, 2021 EUR (€) Rate	Dec. 31, 2020 USD ($)	Dec. 18, 2020 USD ($)	Dec. 31, 2019 USD ($)
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 1,046,733		$ 1,046,733
Unamortized Debt Issuance Expense	(3,119)		(3,119)
Line of Credit Facility, Fair Value of Amount Outstanding	589,565		589,565
Total debt	1,693,107		1,693,107
Debt, Current	(53,524)		(53,524)
Long-term Debt	1,639,583		1,639,583
Line of Credit Facility, Remaining Borrowing Capacity	654,200		654,200
Cash and Cash Equivalents, at Carrying Value	183,672	$ 153,686	183,672	$ 153,686		$ 94,254		$ 207,785
Gain (Loss) on Derivative Used in Net Investment Hedge, after Tax	9,400	$ 11,200	21,200	$ 11,300
Cumulative (gain) loss in other other comprehensive income related to the change in a net investment hedge.	7,600		7,600
Line of Credit Facility, Maximum Borrowing Capacity	1,250,000		1,250,000
Write off of Deferred Debt Issuance Cost			200
Debt Issuance Costs, Gross	2,000		2,000
Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	598,481		598,481
Unamortized Debt Issuance Expense	(1,519)		(1,519)
Line of Credit Facility, Fair Value of Amount Outstanding	412,473		412,473
Total debt	1,014,448		1,014,448
Debt, Current	(351)		(351)
Long-term Debt	1,014,097		1,014,097
Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	448,252		448,252
Unamortized Debt Issuance Expense	(1,600)		(1,600)
Line of Credit Facility, Fair Value of Amount Outstanding	177,092		177,092
Total debt	678,659		678,659
Debt, Current	(53,173)		(53,173)
Long-term Debt	$ 625,486		$ 625,486
1.06% Euro-Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage							1.06%
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes							$ 125,000
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]
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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
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4.24% Senior Notes [Member] \| Us Dollar Amounts Member
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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]
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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
Debt Instrument, Term			15 years
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	$ 146,056		$ 146,056
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	$ 146,056		$ 146,056
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	$ 157,740		$ 157,740
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	$ 157,740		$ 157,740
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	$ 1,250,000		$ 1,250,000
Other local arrangements [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Other Borrowings	56,809		56,809
Other local arrangements [Member] \| Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Other Borrowings	3,494		3,494
Other local arrangements [Member] \| Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Other Borrowings	$ 53,315		$ 53,315
Swiss Pension Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	0.85%		0.85%		0.85%
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
1.06% Euro-Senior Notes
Debt Instrument [Line Items]
Euro Notes - USD Amount	146,056		146,056
1.06% Euro-Senior Notes \| Us Dollar Amounts Member
Debt Instrument [Line Items]
Euro Notes - USD Amount	0		0
1.06% Euro-Senior Notes \| Other Principal Trading Currencies [Member]
Debt Instrument [Line Items]
Euro Notes - USD Amount	$ 146,056		$ 146,056
2.83% Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage \| Rate	2.83%		2.83%		2.83%
Debt Instrument, Maturity Date			Jul. 22, 2033
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 125,000		$ 125,000
Debt Instrument, Term			12 years
2.83% Senior Notes \| Us Dollar Amounts Member
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	125,000		$ 125,000
2.83% Senior Notes \| Other Principal Trading Currencies [Member]
Long-Term Debt, by Current and Noncurrent, and Short-Term Debt
Senior Notes	$ 0		$ 0