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Stock-Based Compensation - Summary of the Company's Stock Option Activity (Details) - Stock Options - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Shares      
Options outstanding at the beginning of the period (in shares) 5.5 5.6  
Granted (in shares) 1.8 0.7 0.3
Exercised (in shares) (2.9) (0.5)  
Canceled (in shares) (0.2) (0.3)  
Forfeited (in shares) (0.3)    
Options outstanding at the end of the period (in shares) 3.9 5.5 5.6
Options exercisable (in shares) 2.0    
Weighted Average Exercise Price      
Options outstanding at the beginning of the period (in dollars per share) $ 19.04 $ 18.23  
Granted (in dollars per share) 4.30 21.02  
Exercised (in dollars per share) 3.27 9.63  
Options forfeited weighted average cost (in dollars per share) 4.21    
Options canceled weighted average cost (in dollars per share) 4.32 23.70  
Options outstanding at the end of the period (in dollars per share) 4.44 $ 19.04 $ 18.23
Options exercisable (in dollars per share) $ 4.55    
Aggregate Intrinsic Value      
Options outstanding (in dollars) $ 7.5    
Options exercisable (in dollars) $ 3.9