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Product Warranty Obligations
9 Months Ended
Jun. 30, 2011
Product Warranty Obligations [Abstract]  
Product Warranty Obligations
7. Product Warranty Obligations
We record a liability for product warranty obligations at the time of sale to a customer based upon historical warranty experience. Most of our products are covered under a warranty period that runs for twelve months from either the date of sale or from installation to an end-user or Original Equipment Manufacturer (OEM) customer. We also record a liability for specific warranty matters when they become probable and reasonably estimable. Our product warranty obligations are included in other current liabilities in the Condensed Consolidated Balance Sheet.
Changes in the product warranty obligations for the nine months ended June 30, 2011 and 2010 are (in millions):
                 
    Nine Months Ended  
    June 30,  
    2011     2010  
 
               
Balance at beginning of period
  $ 37.3     $ 32.1  
Warranties recorded at time of sale
    27.3       30.6  
Adjustments to pre-existing warranties
    (3.0 )     (1.2 )
Settlements of warranty claims
    (24.2 )     (25.3 )
 
           
 
               
Balance at end of period
  $ 37.4     $ 36.2