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Commitments (Tables)
9 Months Ended
Sep. 30, 2012
Commitments [Abstract]  
Changes in the Company's warranty liabilities
                 
($ in millions)   2012     2011  

Balance at January 1

  $ 6.7     $ 5.5  

Provisions to expense

    4.7       6.4  

Actual costs incurred

    (4.6     (5.9
   

 

 

   

 

 

 

Balance at September 30

  $ 6.8     $ 6.0