Allowance for Doubtful Accounts (Tables)

12 Months Ended

Sep. 30, 2020

Allowance For Doubtful Accounts [Abstract]

Allowance for Doubtful Accounts

The following table summarizes changes in the valuation of the allowance for doubtful accounts (in millions):

Year Ended September 30,	Beginning Balance		Charged to Operations		Write-offs			Ending Balance
2020	$	13.1	$	19.2	$	(13.1	)	$	19.2
2019		17.6		9.5		(14.0	)		13.1
2018		11.8		11.0		(5.2	)		17.6