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Stock-based Compensation - Schedule of Restricted Stock Awards and Restricted Stock Units (Details) - Restricted Stock and Restricted Stock Units [Member]
shares in Millions
9 Months Ended
Sep. 30, 2019
$ / shares
shares
Awards (in millions)  
Beginning Balance | shares 1.6
Granted (in shares) | shares 0.7
Vested (in shares) | shares (0.7)
Forfeited (in shares) | shares (0.4)
Ending Balance | shares 1.2
Weighted Average Exercise Price (usd per share)  
Beginning Balance (usd per share) | $ / shares $ 29.12
Granted (usd per share) | $ / shares 26.98
Vested (usd per share) | $ / shares 28.53
Forfeited (usd per share) | $ / shares 28.56
Ending Balance (usd per share) | $ / shares $ 28.38