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Stock-based Compensation - Schedule of Performance Shares Award Outstanding Activity (Details) - Performance Shares
shares in Millions
6 Months Ended
Jun. 30, 2021
$ / shares
shares
Awards/Units (millions)  
Beginning Balance (in shares) | shares 0.5
Granted (in shares) | shares 0.4
Vested (in shares) | shares 0.0
Forfeited (in shares) | shares (0.2)
Ending Balance (in shares) | shares 0.7
Weighted- Average Exercise Price  
Beginning Balance (in usd per share) | $ / shares $ 31.07
Granted (in usd per share) | $ / shares 29.53
Vested (in usd per share) | $ / shares 0
Forfeited (in usd per share) | $ / shares 31.85
Ending Balance (in usd per share) | $ / shares $ 30.11