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Stock Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation Activity [Table Text Block]
 
Stock Incentive Awards(a)
 
Shares
 
Weighted-Average Grant Date Fair Value
 
Weighted-Average Remaining Contractual Term in Years
Units outstanding at January 1, 2016
44.0

 
$
16.48

 
3.0
Granted
21.2

 
$
31.80

 
 
Settled
(8.4
)
 
$
33.18

 
 
Forfeited or expired
(1.7
)
 
$
22.45

 
 
Units outstanding at December 31, 2016
55.1

 
$
19.77

 
2.5

__________
(a)    Includes the target amount of PSUs.