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Stock based compensation (Stock Option Activity) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Number of shares [Roll Forward]    
Number of shares, beginning balance 7,100,000  
Number of shares, granted 300,000  
Number of shares, exercised (900,000)  
Number of shares, forfeited/expired (500,000)  
Number of shares, ending balance 6,000,000 7,100,000
Number of shares, options exercisable 3,800,000  
Weighted average exercise price [Roll Forward]    
Weighted average exercise price, beginning balance (in dollars per share) $ 9.84  
Weighted average exercise price, granted (in dollars per share) $ 26.05  
Weighted average exercise price, exercised (in dollars per share) $ 7.48  
Weighted average exercise price, forfeited/expired (in dollars per share) $ 14.7  
Weighted average exercise price, ending balance (in dollars per share) $ 10.76 $ 9.84
Weighted average exercise price, options exercisable (in dollars per share) $ 8.58  
Remaining weighted average contractual life in years, outstanding 6 years 9 months 7 years 4 months 24 days
Remaining weighted average contractual life in years, exercisable 6 years 3 months  
Intrinsic value, options outstanding $ 22.8 $ 105.6
Intrinsic value, options exercisable $ 11.5  
Stock Options [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise period 10 years  
Award vesting period 4 years