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Incentive Compensation Plans Schedule of Nonvested Stock Activity (Tables)
 12 Months Ended
Dec. 31, 2015
Summary of Stock Options Assumptions [Abstract]  
Schedule of Nonvested Share Activity [Table Text Block]
A summary of the activity of our non-vested stock-settled awards, cash-settled awards and performance-based awards during 2015 is presented below (performance-based awards are shown at 100% of the shares originally granted).
 
 
Stock-Settled Awards
 
Cash-Settled Awards
 
Performance-Based Awards
 
 
Awards
 
Weighted-
Average
Grant-Date
Fair Value
(per award)
 
Awards
 
Weighted-
Average
Grant-Date
Fair Value
(per award)
 
Awards
 
Weighted-
Average
Grant-Date
Fair Value
(per award)
Non-vested as of January 1, 2015
 
2.2

 
$
15.47

 
0.1

 
$
16.99

 
5.8

 
$
14.39

Granted
 
0.8

 
22.07

 
0.1

 
20.46

 
2.9

 
20.88

Vested
 
(0.9
)
 
14.10

 
(0.1
)
 
11.99

 
(0.8
)
 
11.09

Forfeited
 
(0.1
)
 
17.92

 
0.0

 
0.00

 
(0.8
)
 
13.36

Non-vested as of December 31, 2015
 
2.0

 
$
18.53

 
0.1

 
$
18.75

 
7.1

 
$
17.50

Total unrecognized compensation expense remaining
 
$
16.2

 
 
 
$
1.8

 
 
 
$
87.1

 
 
Weighted-average years expected to be recognized over
 
1.3

 
 
 
1.7

 
 
 
1.8