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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        
Principal amount issued       € 375,000,000
Interest rate, stated percentage       0.875%
Additional principal amount issued   € 75,000,000    
Premium on debt issued   112.43802%    
Share reference price (euros per share) | € / shares   € 48.8355 € 40.7940  
Conversion premium percentage   40.00%    
Nominal value of each synthetic bond € 100,000      
Conversion ratio 0.003558257      
Conversion price (euros per share) | € / shares € 28.8632   € 57.1116