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Product Warranty Obligations (Tables)
 3 Months Ended
Dec. 31, 2012
Product Warranties Disclosures [Abstract]  
Changes in the product warranty obligations
Changes in the product warranty obligations for the three months ended December 31, 2012 and 2011 are (in millions):
 
Three Months Ended
December 31,
 
2012
 
2011
Balance at beginning of period
$
37.8

 
$
38.5

Accruals for warranties issued during the current period
8.2

 
9.6

Adjustments to pre-existing warranties
(1.0
)
 
3.1

Settlements of warranty claims
(8.8
)
 
(7.1
)
Balance at end of period
$
36.2

 
$
44.1