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Product Warranty Obligations (Tables)
 6 Months Ended
Mar. 31, 2012
Product Warranties Disclosures [Abstract]  
Changes in the product warranty obligations
Changes in the product warranty obligations for the six months ended March 31, 2012 and 2011 are (in millions):
 
 
Six Months Ended
March 31,
 
2012
 
2011
Balance at beginning of period
$
38.5

 
$
37.3

Accruals for warranties issued during the current period
17.9

 
18.5

Adjustments to pre-existing warranties
2.0

 
(3.1
)
Settlements of warranty claims
(15.7
)
 
(16.7
)
Balance at end of period
$
42.7

 
$
36.0