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Incentive Compensation Plans Schedule of Stock Options Activity (Tables)
 12 Months Ended
Dec. 31, 2015
Summary of Stock Options Assumptions [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following tables are a summary of stock option activity during 2015.
 
 
Options
 
Weighted-
Average
Exercise Price
(per option)
 
Weighted-
Average
Remaining
Contractual Term
(in years)
 
Aggregate
Intrinsic
Value
Stock options outstanding as of January 1, 2015
 
7.4

 
$
9.70

 
 
 
 
Exercised
 
(1.4
)
 
9.99

 
 
 
 
Stock options outstanding as of December 31, 2015
 
6.0

 
$
9.63

 
3.5
 
$
82.4

Stock options vested and expected to vest as of December 31, 2015
 
6.0

 
$
9.63

 
3.5
 
$
82.4

Stock options exercisable as of December 31, 2015
 
5.8

 
$
9.51

 
3.4
 
$
80.1

 
 
 
 
 
 
 
 
 
 
 
Options
 
Weighted-
Average Grant
Date Fair Value
(per option)
 
Weighted-
Average
Remaining
Contractual Term
(in years)
 
Aggregate
Intrinsic
Value
Non-vested as of January 1, 2015
 
0.6

 
$
4.16

 
 
 
 
Vested
 
(0.4
)
 
4.18

 
 
 
 
Non-vested as of December 31, 2015
 
0.2

 
$
4.14

 
7.2
 
$
2.4