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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2017
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.
 
2017
 
2016
 
2015
 
(in millions)
Balance at beginning of year
$
4.5

 
$
3.9

 
$
3.8

Provision charged to expense
0.3

 
0.6

 
0.2

Balances written off, net of recoveries
(0.8
)
 
—

 
(0.2
)
Other
0.1

 
—

 
0.1

Balance at end of year
$
4.1

 
$
4.5

 
$
3.9
Schedule of Reserves for Excess and Obsolete Inventory
The following table summarizes information concerning our inventory valuation reserves.
 
2017
 
2016
 
2015
 
(in millions)
Balance at beginning of year
$
4.6

 
$
4.4

 
$
4.8

Provision charged to expense
2.0

 
2.1

 
1.4

Inventory disposed
(2.1
)
 
(2.1
)
 
(1.8
)
Other
(0.1
)
 
0.2

 
—

Balance at end of year
$
4.4

 
$
4.6

 
$
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.
 
2017
 
2016
 
2015
 
(in millions)
Balance at beginning of year
$
2.0

 
$
2.9

 
$
2.4

Warranty expense
12.3

 
5.3

 
5.1

Warranty payments
(5.8
)
 
(6.2
)
 
(4.6
)
Balance at end of year
$
8.5

 
$
2.0

 
$
2.9