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Product Warranty Obligations (Tables)
 6 Months Ended
Mar. 31, 2016
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability
Changes in product warranty obligations for the six months ended March 31, 2016 and 2015 are (in millions):
 
Six Months Ended
March 31,
 
2016
 
2015
Balance at beginning of period
$
27.9

 
$
34.1

Accruals for warranties issued during the current period
12.6

 
13.5

Adjustments to pre-existing warranties
0.1

 
(0.6
)
Settlements of warranty claims
(12.5
)
 
(14.5
)
Balance at end of period
$
28.1

 
$
32.5