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Guarantees (Tables)
 6 Months Ended
Mar. 31, 2018
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 March 31
 
Year to Date Ended March 31
 
2018
 
2017
 
2018
 
2017
Balance at beginning of period
$
25.3

 
$
26.3

 
$
25.5

 
$
27.5

Provision for warranties during the period
4.0

 
3.7

 
7.5

 
6.3

Warranty reserves acquired
—

 
1.9

 
—

 
1.9

Warranty claims during the period
(4.3
)
 
(4.5
)
 
(8.0
)
 
(8.3
)
Balance at end of period
$
25.0

 
$
27.4

 
$
25.0

 
$
27.4