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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2014
Share-based Compensation [Abstract]  
Schedule of Stock-Based Compensation Costs
 
Predecessor
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2014
 
2013
 
2014
 
2013
 
(millions)
Total stock-based compensation costs:
 
 
 
 
 
 
 
Restricted stock and restricted stock units
$
0.1

 
$
0.3

 
$
0.6

 
$
1.6

Stock options, performance awards and other
—

 
—

 
—

 
0.1

Expense included in selling, general and administrative and advanced technology costs
$
0.1

 
$
0.3

 
$
0.6

 
$
1.7

Total recognized tax benefit
$
—

 
$
—

 
$
—

 
$
—