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Debt (Tables)
 9 Months Ended
Sep. 30, 2013
Line of Credit Facility [Abstract]  
Schedule of Credit Facility
 
September 30,
2013
 
December 31,
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
 
December 31,
2012
 
Additions
 
Reductions
 
September 30,
2013
Other current assets:
 
 
 
 
 
 
 
Bank credit facilities
$
3.0

 
$
2.1

 
$
(5.1
)
 
$
—

 
 
 
 
 
 
 
 
Deferred financing costs (long-term):
 

 
 

 
 

 
 

Convertible notes
$
3.6

 
$
—

 
$
(1.5
)
 
$
2.1