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Debt (Synthetic Bonds) (Details) - Convertible debt - Synthetic bonds due 2021
Mar. 10, 2016
EUR (€)
€ / shares
Mar. 03, 2016
EUR (€)
€ / shares
Feb. 03, 2016
€ / shares
Jan. 25, 2016
EUR (€)
Debt Instrument [Line Items]        
Debt instrument, face amount       € 375,000,000
Interest rate, stated percentage       0.875%
Debt instrument, face amount, additional debt issued   € 75,000,000    
Debt instrument, unamortized premium, percentage   112.43802%    
Debt instrument, convertible, share reference price | € / shares   € 48.8355 € 40.7940  
Debt instrument, convertible, conversion premium, percentage   40.00%    
Debt instrument, convertible, conversion price | € / shares € 28.8632   € 57.1116  
Debt instrument, convertible, conversion ratio 3,464.6193      
Debt instrument, face amount of individual bonds issued € 100,000