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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2013
Share-based Compensation [Abstract]  
Schedule of Stock-Based Compensation Costs
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2013
 
2012
 
2013
 
2012
 
(millions)
Total stock-based compensation costs:
 
 
 
 
 
 

Restricted stock and restricted stock units
$
0.4

 
$
1.3

 
$
1.3

 
$
2.5

Stock options, performance awards and other
—

 
0.2

 
0.1

 
0.5

Less: costs capitalized as part of inventory
—

 
(0.1
)
 
—

 
(0.1
)
Expense included in selling, general and administrative and advanced technology costs
$
0.4

 
$
1.4

 
$
1.4

 
$
2.9

Total recognized tax benefit
$
—

 
$
—

 
$
—

 
$
—