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Stock-based Compensation - Schedule of Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
6 Months Ended
Jun. 30, 2021
Awards (in millions)  
Beginning Balance (in shares) 2.5
Granted (in shares) 0.0
Exercised (in shares) (0.5)
Forfeited/Expired (in shares) (0.4)
Ending Balance (in shares) 1.6
Weighted- Average Exercise Price  
Beginning Balance (in usd per share) $ 27.34
Granted (in usd per share) 0
Exercised (in usd per share) 28.26
Forfeited/Expired (in usd per share) 32.00
Ending Balance (in usd per share) $ 25.77
Vested and Expected to Vest  
Vested and expected to vest, awards (in shares) 1.6
Vested and expected to vest, weighted average exercise price (in usd per share) $ 25.77
Vested and expected to vest, aggregate intrinsic value $ 7.8
Vested and expected to vest, weighted average contractual life (in years) 5 years 3 months 7 days
Exercisable  
Exercisable, awards (in shares) 1.4
Exercisable, weighted average exercise price (in usd per share) $ 25.64
Exercisable, aggregate intrinsic value $ 7.2
Exercisable, weighted average contractual life (in years) 4 years 11 months 23 days