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Product Warranty Obligations
 12 Months Ended
Sep. 30, 2021
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,
 20212020
Beginning balance$20.8 $25.2 
Warranties recorded at time of sale17.3 17.8 
Adjustments to pre-existing warranties(6.2)(1.6)
Settlements of warranty claims(13.9)(20.6)
Ending balance$18.0 $20.8