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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Accounting Policies [Abstract]    
Financing Receivable, Current, Allowance for Credit Loss [Table Text Block]  
The following table summarizes information concerning our allowance for credit losses.
 
2019
 
2018
 
2017
 
(in millions)
Balance at beginning of year
$
4.0

 
$
4.1

 
$
4.5

Provision charged to expense
0.3

 
0.5

 
0.3

Balances written off, net of recoveries
(0.2
)
 
(0.7
)
 
(0.8
)
Reclassification under ASC 606
(0.6
)
 
—

 
—

Other
—

 
0.1

 
0.1

Balance at end of year
$
3.5

 
$
4.0

 
$
4.1
Schedule of Reserves for Excess and Obsolete Inventory  
The following table summarizes information concerning our inventory valuation reserves.
 
2019
 
2018
 
2017
 
(in millions)
Balance at beginning of year
$
5.1

 
$
4.4

 
$
4.6

Provision charged to expense
3.4

 
2.2

 
2.0

Inventory disposed
(1.2
)
 
(1.2
)
 
(2.1
)
Other
0.2

 
(0.3
)
 
(0.1
)
Balance at end of year
$
7.5

 
$
5.1

 
$
4.4
Schedule of Product Warranty Liability
Activity in accrued warranty, reported as part of both other current liabilities and other noncurrent liabilities, is presented below.
 
2019
 
2018
 
2017
 
(in millions)
Balance at beginning of year
$
20.0

 
$
8.5

 
$
2.0

Warranty accruals
3.9

 
18.7

 
12.3

Warranty costs
(6.8
)
 
(7.2
)
 
(5.8
)
Balance at end of year
$
17.1

 
$
20.0

 
$
8.5