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Stock-based Compensation - Stock Option Activity (Details) - Stock Option Plans 2003 and 2013 - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Shares    
Beginning balance (in shares) 1.5 2.1
Granted, net (in shares) 0.6  
Released (in shares) (0.3) (0.6)
Forfeited (in shares) (0.1) 0.0
Ending balance (in shares) 1.7 1.5
Options exercisable (in shares) 0.9  
Weighted Average Exercise Price    
Beginning balance weighted average exercise price (dollars per share) $ 50.46 $ 42.75
Granted weighted average exercise price (dollars per share) 69.04 0.00
Released weighted average exercise price (in dollars per share) 38.44 24.72
Forfeited weighted average exercise price (dollars per share) 67.45 58.37
Ending balance weighted average exercise price (dollars per share) 58.93 $ 50.46
Options exercisable weighted average exercise price (dollars per share) $ 51.57  
Options outstanding weighted average remaining contractual term (in years) 6 years 11 months 23 days  
Options outstanding weighted average intrinsic value $ 1.5  
Options exercisable weighted average remaining contractual term (in years) 5 years 7 months 28 days  
Options exercisable weighted average intrinsic value $ 10.2