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Product Warranty Obligations (Tables)
 9 Months Ended
Jun. 30, 2014
Product Warranties Disclosures [Abstract]  
Changes in product warranty obligations
Changes in product warranty obligations for the nine months ended June 30, 2014 and 2013 are (in millions):
 
Nine Months Ended
June 30,
 
2014
 
2013
Balance at beginning of period
$
36.9

 
$
37.8

Accruals for warranties issued during the current period
23.3

 
23.6

Adjustments to pre-existing warranties
(2.7
)
 
(0.6
)
Settlements of warranty claims
(20.8
)
 
(25.3
)
Balance at end of period
$
36.7

 
$
35.5