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Product Warranty Obligations (Tables)
 6 Months Ended
Mar. 31, 2015
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability
Changes in product warranty obligations for the six months ended March 31, 2015 and 2014 are (in millions):
 
Six Months Ended
March 31,
 
2015
 
2014
Balance at beginning of period
$
34.1

 
$
36.9

Accruals for warranties issued during the current period
13.5

 
15.4

Adjustments to pre-existing warranties
(0.6
)
 
(1.3
)
Settlements of warranty claims
(14.5
)
 
(14.0
)
Balance at end of period
$
32.5

 
$
37.0