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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based Compensation, Stock Options, Activity [Table Text Block]
 
Quarter Ended September 30,
 
Nine Months Ended September 30,
Dollar amounts in millions
2017
 
2016
 
2017
 
2016
Total stock-based compensation expense (costs of sales and general and administrative)
$
2.0

 
$
3.2

 
$
8.0

 
$
9.4

Income tax provision (benefit) related to stock-based compensation
$
0.2

 
$
(0.4
)
 
$
0.5

 
$
(3.2
)
Impact on cash flow due to taxes paid related to net share settlement of equity awards
$
0.5

 
$
0.8

 
$
5.3

 
$
8.9