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Product Warranty Obligations (Tables)
 9 Months Ended
Jun. 30, 2018
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability
Changes in product warranty obligations are (in millions):
 
Nine Months Ended
June 30,
 
2018
 
2017
Balance at beginning of period
$
28.5

 
$
28.0

Accruals for warranties issued during the current period
19.2

 
19.0

Adjustments to pre-existing warranties
0.2

 
(1.5
)
Settlements of warranty claims
(17.9
)
 
(18.3
)
Balance at end of period
$
30.0

 
$
27.2