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Subsequent events (Details) - Subsequent Event.
€ in Millions, shares in Millions, $ in Millions
Aug. 07, 2017
USD ($)
shares
Jul. 31, 2017
EUR (€)
employee
Common shares    
Subsequent events.    
Stock Repurchase Program, Authorized Amount | $ $ 100  
Common shares | Forecast    
Subsequent events.    
Expected reduction in number of common shares outstanding | shares 2.5  
Recklinghausen, Germany | Recklinghausen beverage container and end production facilities | Disposal group, not discontinued operations    
Subsequent events.    
Number of employees | employee   360
Recklinghausen, Germany | Recklinghausen beverage container and end production facilities | Disposal group, not discontinued operations | Forecast    
Subsequent events.    
Business Exit Costs | €   € 62
Severance costs (as a percent)   80.00%
Equipment removal and facility cleanup costs (as a percent)   10.00%
Accelerated depreciation and write-downs to net realizable value of certain fixed assets, related spare parts and inventory (as a percent)   10.00%