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Product Warranty Obligations (Tables)
 3 Months Ended
Dec. 31, 2016
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability
Changes in product warranty obligations for the three months ended December 31, 2016 and 2015 are (in millions):
 
Three Months Ended
December 31,
 
2016
 
2015
Balance at beginning of period
$
28.0

 
$
27.9

Accruals for warranties issued during the current period
6.1

 
6.4

Adjustments to pre-existing warranties
(0.3
)
 
(0.5
)
Settlements of warranty claims
(6.6
)
 
(6.2
)
Balance at end of period
$
27.2

 
$
27.6