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Guarantees (Tables)
 3 Months Ended
Dec. 31, 2016
Product Warranties Disclosures [Abstract]  
Reconciliation of Changes in the Warranty Reserve
A reconciliation of changes in the warranty reserve for the periods covered in this report is as follows:
 
Quarter Ended December 31
 
2016
 
2015
Balance at beginning of period
$
27.5

 
$
32.1

Provision for warranties during the period
2.6

 
6.0

Warranty claims during the period
(3.8
)
 
(5.4
)
Balance at end of period
$
26.3

 
$
32.7