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Debt (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Senior Notes $ 488,356,000  
Unamortized Debt Issuance Expense (1,794,000) $ (1,800)
Debt, Long-term and Short-term, Combined Amount 699,253,000  
Short-term borrowings and current maturities of long-term debt 17,381,000 14,488,000
Long-term Debt, Excluding Current Maturities 681,872,000 $ 575,138,000
Gain (Loss) on Derivative Used in Net Investment Hedge, Net of Tax 3,600,000  
3.67 Percent Senior Notes [Member]    
Debt Instrument [Line Items]    
Senior Notes 50,000,000  
Debt Instrument, Face Amount $ 50,000,000  
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 $ 50,000,000  
Debt Instrument, Face Amount $ 50,000,000  
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 $ 125,000,000  
Debt Instrument, Face Amount $ 125,000,000  
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 $ 125,000,000  
Debt Instrument, Face Amount $ 125,000,000  
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 $ 140,150,000  
Debt Instrument, Face Amount $ 125,000,000  
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 $ 601,956,000  
Long-term Line of Credit 193,516,000  
Other Local Arrangements [Member]    
Debt Instrument [Line Items]    
Other Borrowings 17,381,000  
Us Dollar Amounts Member    
Debt Instrument [Line Items]    
Senior Notes 348,612,000  
Unamortized Debt Issuance Expense (1,388,000)  
Debt, Long-term and Short-term, Combined Amount 525,112,000  
Short-term borrowings and current maturities of long-term debt 0  
Long-term Debt, Excluding Current Maturities 525,112,000  
Us Dollar Amounts Member | 3.67 Percent Senior Notes [Member]    
Debt Instrument [Line Items]    
Senior Notes 50,000,000  
Us Dollar Amounts Member | 4.10% Senior Notes [Member]    
Debt Instrument [Line Items]    
Senior Notes 50,000,000  
Us Dollar Amounts Member | 3.84% Senior Notes [Member]    
Debt Instrument [Line Items]    
Senior Notes 125,000,000  
Us Dollar Amounts Member | 4.24% Senior Notes [Member]    
Debt Instrument [Line Items]    
Senior Notes 125,000,000  
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 176,500,000  
Us Dollar Amounts Member | Other Local Arrangements [Member]    
Debt Instrument [Line Items]    
Other Borrowings 0  
Other Principal Trading Currencies [Member]    
Debt Instrument [Line Items]    
Senior Notes 139,744,000  
Unamortized Debt Issuance Expense (406,000)  
Debt, Long-term and Short-term, Combined Amount 174,141,000  
Short-term borrowings and current maturities of long-term debt 17,381,000  
Long-term Debt, Excluding Current Maturities 156,760,000  
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 140,150,000  
Other Principal Trading Currencies [Member] | $ 800 Million Credit Agreement [Member]    
Debt Instrument [Line Items]    
Long-term Line of Credit 17,016,000  
Other Principal Trading Currencies [Member] | Other Local Arrangements [Member]    
Debt Instrument [Line Items]    
Other Borrowings $ 17,381,000