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Stock-based Compensation - Schedule of Share-based Compensation, Restricted Stock and Restricted Units Activity (Details) - Restricted Stock and Restricted Stock Units [Member]
shares in Millions
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]  
Beginning balance (in shares) | shares 1.9
Granted (in shares) | shares 1.1
Vested (in shares) | shares (1.2)
Forfeited (in shares) | shares (0.2)
Ending balance (in shares) | shares 1.6
Beginning balance (in dollars per share) | $ / shares $ 29.32
Granted (in dollars per share) | $ / shares 29.61
Vested (in dollars per share) | $ / shares 29.84
Forfeited (in dollars per share) | $ / shares 29.33
Ending balance (in dollars per share) | $ / shares $ 29.12