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Debt (Details)
 1 Months Ended 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2015
Debt Instrument [Line Items]      
Debt Covenant, Maximum Net Debt to EBITDA Ratio     3.00
Debt Covenant, Minimum Interest Coverage Ratio     3.50
Line of Credit [Member] | Revolving Credit Agreement [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Term   5 years  
Maximum borrowings under credit facility $ 500,000,000 $ 500,000,000  
Credit facility accordion feature $ 200,000,000 200,000,000  
Covenant provisions the Company to maintain (a) a maximum net debt to EBITDA ratio of 3.00 and (b) a minimum interest coverage ratio of 3.50. The Company was in compliance with all of its covenants under the Credit Agreement at September 30, 2015.    
Minimum margin on borrowings (in hundredths) 1.25%    
Maximum margin on borrowings (in hundredths) 2.00%    
Minimum annual commitment fees on undrawn amounts (in hundredths) 0.20%    
Maximum annual commitment fees on undrawn amounts (in hundredths) 0.30%    
Applicable interest rate (in hundredths)     1.50%
Line of Credit [Member] | Euro Revolver [Member]      
Debt Instrument [Line Items]      
Applicable interest rate (in hundredths)     1.13%
Line of Credit, Sublimit In Euro [Member] | Revolving Credit Agreement [Member]      
Debt Instrument [Line Items]      
Maximum borrowings under credit facility $ 300,000,000 $ 300,000,000