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Stock-based Compensation - Schedule of Performance Stock Awards and PSUs (Details) - Performance Shares [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 0.6
Granted (in shares) | shares 0.3
Vested (in shares) | shares 0.0
Forfeited (in shares) | shares (0.1)
Ending balance (in shares) | shares 0.8
Beginning balance (in dollars per share) | $ / shares $ 31.17
Granted (in dollars per share) | $ / shares 33.81
Vested (in dollars per share) | $ / shares 0
Forfeited (in dollars per share) | $ / shares 33.65
Ending balance (in dollars per share) | $ / shares $ 31.82