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Debt (Details)
€ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2015
EUR (€)
Dec. 31, 2014
USD ($)
Sep. 30, 2015
USD ($)
Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior Note Agreements, aggregate principal amount     $ 600,000,000
Senior notes payable, consolidated leverage ratio, maximum 3.5    
Series A Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior notes payable   $ 75,000,000  
Senior notes payable, stated interest rate   3.25%  
Senior notes payable, term   7 years  
Series B Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior notes payable   $ 75,000,000  
Senior notes payable, stated interest rate   3.72%  
Senior notes payable, term   12 years  
Series C Senior Note [Member]      
Debt Instrument [Line Items]      
Senior notes payable € 88.9   $ 100,000,000
Senior notes payable, stated interest rate 1.785%   1.785%
Shelf Notes [Member]      
Debt Instrument [Line Items]      
Senior notes payable     $ 75,000,000
Senior notes payable, term 12 years