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Product Warranty Obligations (Tables)
 9 Months Ended
Jun. 30, 2019
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability
Changes in product warranty obligations are (in millions):
 
Nine Months Ended
June 30,
 
2019
 
2018
Balance at beginning of period
$
27.9

 
$
28.5

Accruals for warranties issued during the current period
16.2

 
19.2

Adjustments to pre-existing warranties
(5.8
)
 
0.2

Settlements of warranty claims
(13.0
)
 
(17.9
)
Balance at end of period
$
25.3

 
$
30.0