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Incentive Compensation Plans Schedule of Stock Options Activity (Tables)
 12 Months Ended
Dec. 31, 2018
Summary of Stock Options Assumptions [Abstract]  
Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table summarizes our stock option activity during 2018.
 
 
Options
 
Weighted-
Average
Exercise Price
(per option)
 
Weighted-
Average
Remaining
Contractual Term
(in years)
 
Aggregate
Intrinsic
Value
Stock options outstanding as of January 1, 2018
 
3.7

 
$
9.44

 
 
 
 
Exercised
 
(1.9
)
 
$
8.30

 
 
 
 
Stock options outstanding as of December 31, 2018
 
1.8

 
$
10.66

 
2.8
 
$
17.6