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Share-based compensation - Schedule of management and director options outstanding (Details) (USD $)
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Options outstanding (in shares) 11,269,911.000   10,981,075.000 10,956,838
Options outstanding, weighted average exercise price (in dollars per share) $ 13.40   $ 13.23 $ 13.20
Remaining contractual life 7 years 4 months 24 days 6 years 6 months    
Management and director options
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Options outstanding (in shares) 11,269,911.000      
Options outstanding, weighted average exercise price (in dollars per share) $ 13.40      
Options exercisable (in shares) 3,791,311.000      
Options exercisable, weighted average exercise price (in dollars per share) $ 13.22      
Management and director options | $10.00-$10.89
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Exercise price, lower limit (in dollars per share) $ 10.00      
Exercise price, upper limit (in dollars per share) $ 10.89      
Options outstanding (in shares) 6,528,647      
Options outstanding, weighted average exercise price (in dollars per share) $ 10.03      
Options exercisable (in shares) 2,226,787      
Options exercisable, weighted average exercise price (in dollars per share) $ 10.02      
Management and director options | $15.05-$16.89
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Exercise price, lower limit (in dollars per share) $ 15.05      
Exercise price, upper limit (in dollars per share) $ 16.89      
Options outstanding (in shares) 2,405,516      
Options outstanding, weighted average exercise price (in dollars per share) $ 15.94      
Options exercisable (in shares) 782,262      
Options exercisable, weighted average exercise price (in dollars per share) $ 16.02      
Management and director options | $20.00-$25.05
        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Exercise price, lower limit (in dollars per share) $ 20.00      
Exercise price, upper limit (in dollars per share) $ 25.05      
Options outstanding (in shares) 2,335,748      
Options outstanding, weighted average exercise price (in dollars per share) $ 20.21      
Options exercisable (in shares) 782,262      
Options exercisable, weighted average exercise price (in dollars per share) $ 20.02