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Product Warranty Obligations (Tables)
 3 Months Ended
Dec. 31, 2013
Product Warranties Disclosures [Abstract]  
Changes in the product warranty obligations
Changes in the product warranty obligations for the three months ended December 31, 2013 and 2012 are (in millions):
 
Three Months Ended
December 31,
 
2013
 
2012
Balance at beginning of period
$
36.9

 
$
37.8

Accruals for warranties issued during the current period
7.7

 
8.2

Adjustments to pre-existing warranties
—

 
(1.0
)
Settlements of warranty claims
(8.0
)
 
(8.8
)
Balance at end of period
$
36.6

 
$
36.2