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Product Warranty Obligations (Tables)
 12 Months Ended
Sep. 30, 2012
Product Warranties Disclosures [Abstract]  
Changes in the product warranty obligations
Changes in product warranty obligations are (in millions):
 
 
September 30,
 
 
2012
 
2011
Balance at beginning of period
 
$
38.5

 
$
37.3

Warranties recorded at time of sale
 
35.0

 
38.2

Adjustments to pre-existing warranties
 
(2.1
)
 
(3.9
)
Settlements of warranty claims
 
(33.6
)
 
(33.1
)
Balance at end of period
 
$
37.8

 
$
38.5