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Product Warranty Obligations (Tables)
 12 Months Ended
Sep. 30, 2015
Product Warranties Disclosures [Abstract]  
Changes in product warranty obligations
Changes in product warranty obligations were (in millions):
 
 
September 30,
 
 
2015
 
2014
Beginning balance
 
$
34.1

 
$
36.9

Warranties recorded at time of sale
 
26.7

 
31.3

Adjustments to pre-existing warranties
 
(4.5
)
 
(5.3
)
Settlements of warranty claims
 
(28.4
)
 
(28.8
)
Ending balance
 
$
27.9

 
$
34.1