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Product Warranty Obligations
 12 Months Ended
Sep. 30, 2017
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,
 
 
2017
 
2016
Beginning balance
 
$
28.0

 
$
27.9

Warranties recorded at time of sale
 
25.8

 
25.0

Adjustments to pre-existing warranties
 
(0.2
)
 
1.2

Settlements of warranty claims
 
(25.1
)
 
(26.1
)
Ending balance
 
$
28.5

 
$
28.0