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Product Warranty Obligations (Tables)
 9 Months Ended
Jun. 30, 2012
Product Warranties Disclosures [Abstract]  
Changes in the product warranty obligations
Changes in the product warranty obligations for the nine months ended June 30, 2012 and 2011 are (in millions):
 
Nine Months Ended
June 30,
 
2012
 
2011
Balance at beginning of period
$
38.5

 
$
37.3

Accruals for warranties issued during the current period
27.2

 
27.3

Adjustments to pre-existing warranties
0.6

 
(3.0
)
Settlements of warranty claims
(24.2
)
 
(24.2
)
Balance at end of period
$
42.1

 
$
37.4