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Product Warranty Obligations
 3 Months Ended
Dec. 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 three months ended December 31, 2017 and 2016 are (in millions):
 
Three Months Ended
December 31,
 
2017
 
2016
Balance at beginning of period
$
28.5

 
$
28.0

Accruals for warranties issued during the current period
6.4

 
6.1

Adjustments to pre-existing warranties
3.9

 
(0.3
)
Settlements of warranty claims
(4.9
)
 
(6.6
)
Balance at end of period
$
33.9

 
$
27.2