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Product Warranty Obligations
 9 Months Ended
Jun. 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 probable and reasonably estimable.
Changes in product warranty obligations for the nine months ended June 30, 2017 and 2016 are (in millions):
 
Nine Months Ended
June 30,
 
2017
 
2016
Balance at beginning of period
$
28.0

 
$
27.9

Accruals for warranties issued during the current period
19.0

 
18.7

Adjustments to pre-existing warranties
(1.5
)
 
(0.2
)
Settlements of warranty claims
(18.3
)
 
(19.4
)
Balance at end of period
$
27.2

 
$
27.0