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Product Warranty Obligations
 6 Months Ended
Mar. 31, 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 six months ended March 31, 2017 and 2016 are (in millions):
 
Six Months Ended
March 31,
 
2017
 
2016
Balance at beginning of period
$
28.0

 
$
27.9

Accruals for warranties issued during the current period
12.5

 
12.6

Adjustments to pre-existing warranties
(1.7
)
 
0.1

Settlements of warranty claims
(12.2
)
 
(12.5
)
Balance at end of period
$
26.6

 
$
28.1