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Debt (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Debt Instrument [Line Items]      
Senior Notes $ 483,251    
Unamortized Debt Issuance Expense (1,591)    
Debt, Long-term and Short-term, Combined Amount 963,687    
Short-term borrowings and current maturities of long-term debt 19,476   $ 18,974
Long-term Debt, Excluding Current Maturities 944,211   $ 875,056
Gain (Loss) on Derivative Used in Net Investment Hedge, Net of Tax 3,300 $ 3,600  
3.67 Percent Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior Notes 50,000    
Debt Instrument, Face Amount $ 50,000    
Debt Instrument, Maturity Date Dec. 17, 2022    
Debt Instrument, Interest Rate, Stated Percentage 3.67%    
4.10% Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior Notes $ 50,000    
Debt Instrument, Face Amount $ 50,000    
Debt Instrument, Maturity Date Sep. 19, 2023    
Debt Instrument, Interest Rate, Stated Percentage 4.10%    
3.84% Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior Notes $ 125,000    
Debt Instrument, Face Amount $ 125,000    
Debt Instrument, Maturity Date Sep. 19, 2024    
Debt Instrument, Interest Rate, Stated Percentage 3.84%    
4.24% Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior Notes $ 125,000    
Debt Instrument, Face Amount $ 125,000    
Debt Instrument, Maturity Date Jun. 25, 2025    
Debt Instrument, Interest Rate, Stated Percentage 4.24%    
1.47% EURO Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior Notes $ 134,842    
Debt Instrument, Face Amount $ 125,000    
Debt Instrument, Maturity Date Jun. 17, 2030    
Debt Instrument, Interest Rate, Stated Percentage 1.47%    
$ 800 Million Credit Agreement [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Remaining Borrowing Capacity $ 333,592    
Long-term Line of Credit 460,960    
Debt Instrument, Face Amount $ 800,000    
Debt Instrument, Interest Rate, Stated Percentage 0.875%    
Other Local Arrangements [Member]      
Debt Instrument [Line Items]      
Other Borrowings $ 19,476    
Us Dollar Amounts Member      
Debt Instrument [Line Items]      
Senior Notes 348,787    
Unamortized Debt Issuance Expense (1,213)    
Debt, Long-term and Short-term, Combined Amount 681,522    
Short-term borrowings and current maturities of long-term debt 430    
Long-term Debt, Excluding Current Maturities 681,092    
Us Dollar Amounts Member | 3.67 Percent Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior Notes 50,000    
Us Dollar Amounts Member | 4.10% Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior Notes 50,000    
Us Dollar Amounts Member | 3.84% Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior Notes 125,000    
Us Dollar Amounts Member | 4.24% Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior Notes 125,000    
Us Dollar Amounts Member | 1.47% EURO Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior Notes 0    
Us Dollar Amounts Member | $ 800 Million Credit Agreement [Member]      
Debt Instrument [Line Items]      
Long-term Line of Credit 332,305    
Us Dollar Amounts Member | Other Local Arrangements [Member]      
Debt Instrument [Line Items]      
Other Borrowings 430    
Other Principal Trading Currencies [Member]      
Debt Instrument [Line Items]      
Senior Notes 134,464    
Unamortized Debt Issuance Expense (378)    
Debt, Long-term and Short-term, Combined Amount 282,165    
Short-term borrowings and current maturities of long-term debt 19,046    
Long-term Debt, Excluding Current Maturities 263,119    
Other Principal Trading Currencies [Member] | 3.67 Percent Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior Notes 0    
Other Principal Trading Currencies [Member] | 4.10% Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior Notes 0    
Other Principal Trading Currencies [Member] | 3.84% Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior Notes 0    
Other Principal Trading Currencies [Member] | 4.24% Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior Notes 0    
Other Principal Trading Currencies [Member] | 1.47% EURO Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior Notes 134,842    
Other Principal Trading Currencies [Member] | $ 800 Million Credit Agreement [Member]      
Debt Instrument [Line Items]      
Long-term Line of Credit 128,655    
Other Principal Trading Currencies [Member] | Other Local Arrangements [Member]      
Debt Instrument [Line Items]      
Other Borrowings $ 19,046