Summary of Significant Accounting Policies (Tables)

12 Months Ended

Sep. 30, 2020

Sep. 30, 2019

Accounting Policies [Abstract]

Financing Receivable, Current, Allowance for Credit Loss [Table Text Block]

The following table summarizes information concerning our allowance for credit losses.

	2020		2019		2018
	(in millions)
Balance at beginning of year	$	3.5	$	4.0	$	4.1
Provision charged to expense	1.0		0.3		0.5
Balances written off, net of recoveries	—		(0.2)		(0.7)
Reclassification due to adoption of revenue accounting standard	—		(0.6)		—
Other	0.3		—		0.1
Balance at end of year	$	4.8	$	3.5	$	4.0

Schedule of Reserves for Excess and Obsolete Inventory

The following table summarizes information concerning our inventory valuation reserves.

	2020		2019		2018
	(in millions)
Balance at beginning of year	$	7.5	$	5.1	$	4.4
Provision charged to expense	4.7		3.4		2.2
Inventory disposed	(0.7)		(1.2)		(1.2)
Other	0.2		0.2		(0.3)
Balance at end of year	$	11.7	$	7.5	$	5.1

Schedule of Product Warranty Liability

Activity in accrued warranty, reported as part of both other current liabilities and other noncurrent liabilities, is presented below.

	2020		2019		2018
	(in millions)
Balance at beginning of year	$	17.1	$	20.0	$	8.5
Warranty accruals	2.6		3.9		18.7
Warranty costs	(5.3)		(6.8)		(7.2)
Balance at end of year	$	14.4	$	17.1	$	20.0