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Stock based compensation (Stock Option Activity) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Number of shares [Roll Forward]    
Number of shares, beginning balance 5,250  
Number of shares, granted 819  
Number of shares, exercised (151)  
Number of shares, forfeited/expired (47)  
Number of shares, ending balance 5,871 5,250
Number of shares, options exercisable 4,403  
Weighted average exercise price [Roll Forward]    
Weighted average exercise price, beginning balance (in dollars per share) $ 12.94  
Weighted average exercise price, granted (in dollars per share) 9.39  
Weighted average exercise price, exercised (in dollars per share) 11.31  
Weighted average exercise price, forfeited/expired (in dollars per share) 20.93  
Weighted average exercise price, ending balance (in dollars per share) 12.42 $ 12.94
Weighted average exercise price, options exercisable (in dollars per share) $ 11.74  
Remaining weighted average contractual life, outstanding 5 years 3 months 10 days 5 years 7 months 25 days
Remaining weighted average contractual life, exercisable 4 years 2 months 12 days  
Intrinsic value, options outstanding $ 59.1 $ 15.1
Intrinsic value, options exercisable $ 45.2