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Product Warranty Obligations (Tables)
 6 Months Ended
Mar. 31, 2014
Product Warranties Disclosures [Abstract]  
Changes in the product warranty obligations
Changes in the product warranty obligations for the six months ended March 31, 2014 and 2013 are (in millions):
 
Six Months Ended
March 31,
 
2014
 
2013
Balance at beginning of period
$
36.9

 
$
37.8

Accruals for warranties issued during the current period
15.4

 
15.6

Adjustments to pre-existing warranties
(1.3
)
 
0.1

Settlements of warranty claims
(14.0
)
 
(17.1
)
Balance at end of period
$
37.0

 
$
36.4