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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2017
Share-based Compensation [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
A summary of stock-based compensation costs follows (in millions):
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2017
 
2016
 
2017
 
2016
 
 
 
 
 
 
 
 
Total stock-based compensation costs:
 
 
 
 
 
 
 
Restricted stock units
$

 
$

 
$

 
$
0.1

Stock options
0.1

 
0.1

 
0.3

 
0.3

Expense included in selling, general and administrative expense
$
0.1

 
$
0.1

 
$
0.3

 
$
0.4

 
 
 
 
 
 
 
 
Total recognized tax benefit
$

 
$

 
$

 
$