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Restructuring (Tables)
9 Months Ended
Sep. 30, 2012
Restructuring [Abstract]  
Restructuring reserves included in other accrued liabilities
                         
($ in millions)   Severance     Other     Total  

Balance as of December 31, 2011

  $ —       $ 0.3     $ 0.3  

Charges and adjustments

    0.9       (0.3     0.6  

Cash payments

    (0.4     —         (0.4
   

 

 

   

 

 

   

 

 

 

Balance as of September 30, 2012

  $ 0.5     $ —       $ 0.5