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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based Compensation, Stock Options, Activity [Table Text Block]
 
Quarter Ended June 30,
 
Six Months Ended June 30,
Dollar amounts in millions
2017
 
2016
 
2017
 
2016
Total stock-based compensation expense (costs of sales and general and administrative)
$
1.9

 
$
3.2

 
$
6.0

 
$
6.2

Income tax provision related to stock-based compensation
$
0.3

 
$
(4.7
)
 
$
0.3

 
$
(2.8
)
Impact on cash flow due to taxes paid related to net share settlement of equity awards
$
0.1

 
$
7.2

 
$
4.8

 
$
8.1