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Product Warranty Obligations (Tables)
 9 Months Ended
Jun. 30, 2015
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability
Changes in product warranty obligations for the nine months ended June 30, 2015 and 2014 are (in millions):
 
Nine Months Ended
June 30,
 
2015
 
2014
Balance at beginning of period
$
34.1

 
$
36.9

Accruals for warranties issued during the current period
20.0

 
23.3

Adjustments to pre-existing warranties
(2.7
)
 
(2.7
)
Settlements of warranty claims
(20.9
)
 
(20.8
)
Balance at end of period
$
30.5

 
$
36.7