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Debt (Narrative) (Details)
1 Months Ended 9 Months Ended
Sep. 30, 2013
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Oct. 31, 2014
USD ($)
Debt Instrument [Line Items]        
Borrowings under lines of credit and overdrafts   $ 13,200,000 $ 22,680,000  
Revolving Credit Agreement [Member]        
Debt Instrument [Line Items]        
Carrying amount of debt   406,410,000 379,700,000  
Line of credit facility, maximum borrowing capacity $ 750,000,000      
Line of credit facility with accordian feature, maximum borrowing capacity $ 1,000,000,000      
Remaining borrowing capacity   343,590,000 370,300,000  
Revolving Credit Agreement [Member] | Subsidiaries [Member]        
Debt Instrument [Line Items]        
Carrying amount of debt   $ 100,000,000    
Revolving Credit Agreement [Member] | Euro Member Countries, Euro        
Debt Instrument [Line Items]        
Carrying amount of debt     $ 0  
Stated interest rate   1.62% 1.50%  
Revolving Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Variable basis spread 1.10%      
Revolving Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Variable basis spread 1.70%      
Senior Notes [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Debt covenant ratio of EBITDA to cash interest expense       4.25
Senior Notes [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Debt covenant ratio of senior debt to EBITDA       3.25
Debt covenant ratio of total debt to EBITDA       4.00
Senior Notes [Member] | 3.97% Senior Notes [Member]        
Debt Instrument [Line Items]        
Carrying amount of debt   $ 100,000,000 $ 100,000,000  
Stated interest rate       3.97%
Converted amount with accrued interest       $ 100,000,000
Percent allowed to be prepaid       100.00%
Senior Notes [Member] | Adjusted for Certain Acquisitons [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Debt covenant ratio of senior debt to EBITDA       3.50
Debt covenant ratio of total debt to EBITDA       4.25
Revolving Credit Agreement [Member]        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity $ 500,000,000      
Lines of Credit [Member]        
Debt Instrument [Line Items]        
Borrowings under lines of credit and overdrafts   13,200,000 $ 22,500,000  
Line of credit facility, maximum borrowing capacity   $ 56,000,000    
Line of credit, interest rate at period end   1.38% 1.56%  
Bank Overdrafts [Member]        
Debt Instrument [Line Items]        
Borrowings under lines of credit and overdrafts   $ 0 $ 180,000  
Repayment period   2 days