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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2018
Accounting Policies [Abstract]  
Schedule of Credit Losses for Financing Receivables, Current [Table Text Block] The following table summarizes information concerning our allowance for credit losses.
 
2018
 
2017
 
2016
 
(in millions)
Balance at beginning of year
$
4.1

 
$
4.5

 
$
3.9

Provision charged to expense
0.5

 
0.3

 
0.6

Balances written off, net of recoveries
(0.7
)
 
(0.8
)
 
—

Other
0.1

 
0.1

 
—

Balance at end of year
$
4.0

 
$
4.1

 
$
4.5
Schedule of Reserves for Excess and Obsolete Inventory The following table summarizes information concerning our inventory valuation reserves.
 
2018
 
2017
 
2016
 
(in millions)
Balance at beginning of year
$
4.4

 
$
4.6

 
$
4.4

Provision charged to expense
2.2

 
2.0

 
2.1

Inventory disposed
(1.2
)
 
(2.1
)
 
(2.1
)
Other
(0.3
)
 
(0.1
)
 
0.2

Balance at end of year
$
5.1

 
$
4.4

 
$
4.6
Schedule of Product Warranty Liability Activity in accrued warranty, reported as part of both other current liabilities and other noncurrent liabilities, is presented below.
 
2018
 
2017
 
2016
 
(in millions)
Balance at beginning of year
$
8.5

 
$
2.0

 
$
2.9

Warranty accruals
18.7

 
12.3

 
5.3

Warranty costs
(7.2
)
 
(5.8
)
 
(6.2
)
Balance at end of year
$
20.0

 
$
8.5

 
$
2.0