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Product Warranty Obligations
 12 Months Ended
Sep. 30, 2020
Product Warranties Disclosures [Abstract]  
Product Warranty Obligations Product Warranty Obligations
We record a liability for product warranty obligations at the time of sale to a customer based upon historical warranty experience. Most of our products are covered under a warranty period that runs for twelve months from either the date of sale or installation. We also record a liability for specific warranty matters when they become known and reasonably estimable.
Changes in product warranty obligations were (in millions):
 
 
September 30,
 
 
2020
 
2019
Beginning balance
 
$
25.2

 
$
27.9

Warranties recorded at time of sale
 
17.8

 
21.3

Adjustments to pre-existing warranties
 
(1.6
)
 
(5.6
)
Settlements of warranty claims
 
(20.6
)
 
(18.4
)
Ending balance
 
$
20.8

 
$
25.2