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Product Warranty Obligations (Tables)
 6 Months Ended
Mar. 31, 2013
Product Warranties Disclosures [Abstract]  
Changes in the product warranty obligations
Changes in the product warranty obligations for the six months ended March 31, 2013 and 2012 are (in millions):
 
Six Months Ended
March 31,
 
2013
 
2012
Balance at beginning of period
$
37.8

 
$
38.5

Accruals for warranties issued during the current period
15.6

 
17.9

Adjustments to pre-existing warranties
0.1

 
2.0

Settlements of warranty claims
(17.1
)
 
(15.7
)
Balance at end of period
$
36.4

 
$
42.7