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Stock-based Compensation - Schedule of Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
9 Months Ended
Sep. 30, 2019
Awards (in millions)  
Beginning Balance 7.2
Granted (in shares) 0.8
Exercised (in shares) (3.6)
Forfeited (in shares) (0.8)
Ending Balance 3.6
Weighted Average Exercise Price (usd per share)  
Beginning Balance $ 19.32
Granted (usd per share) 26.91
Exercised (usd per share) 12.63
Forfeited (usd per share) 28.94
Ending Balance $ 25.77
Vested and Expected to Vest  
Vested and expected to vest, in shares 3.6
Vested and expected to vest, weighted average exercise price (usd) $ 25.77
Vested and expected to vest, aggregate intrinsic value $ 17.6
Vested and expected to vest, weighted average contractual life (in years) 6 years 1 month 13 days
Exercisable  
Exercisable, in shares 2.5
Exercisable, usd per share $ 24.84
Exercisable, aggregate intrinsic value $ 15.3
Exercisable, weighted average contractual life (in years) 5 years 7 days