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Debt (Tables)
 12 Months Ended
Dec. 31, 2013
Line of Credit Facility [Abstract]  
Schedule of Credit Facility
 
December 31,
 
2013
 
2012
 
(millions)
Borrowings under the revolving credit facility
$
—

 
$
—

Term loan
—

 
83.2

Letters of credit
1.6

 
14.7

Available credit
—

 
87.1
Summary of Deferred Financing Costs
 
Dec. 31,
2011
 
Additions
 
Reductions
 
Dec. 31,
2012
 
Additions/
(Reclasses)
 
Reductions
 
Dec. 31,
2013
Other current assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
Bank credit facilities
$
2.4

 
$
9.2

 
$
(8.6
)
 
$
3.0

 
$
2.2

 
$
(5.2
)
 
$
—

Convertible notes
—

 
—

 
—

 
—

 
1.8

 
(0.2
)
 
1.6

Other long-term assets:
 

 
 

 
 

 
 

 
 

 
 

 
 

Convertible notes
5.5

 
—

 
(1.9
)
 
3.6

 
(1.8
)
 
(1.8
)
 
—

DOE Loan Guarantee application
6.7

 
—

 
(6.7
)
 
—

 
—

 
—

 
—

Total
$
14.6

 
$
9.2

 
$
(17.2
)
 
$
6.6

 
$
2.2

 
$
(7.2
)
 
$
1.6