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Stock Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation Activity
 
Stock Incentive Awards(a)

Shares
 
Weighted-Average Grant Date Fair Value
 
Weighted-Average Remaining Contractual Term in Years
Units outstanding at January 1, 2017
55.1

 
$
19.77

 
2.5
Granted
16.7

 
$
26.75

 
 
Settled
(16.3
)
 
$
24.65

 
 
Forfeited or expired
(2.6
)
 
$
26.67

 
 
Units outstanding at December 31, 2017
52.9

 
$
21.75

 
2.0

__________
(a)
Includes the target amount of PSUs.