Allowance for Doubtful Accounts (Tables)

12 Months Ended

Sep. 30, 2021

Receivables [Abstract]

Schedule of Allowance for Doubtful Accounts

Activity in the allowance for doubtful accounts for the years ended September 30, 2021, 2020, and 2019 was as follows:

(in millions)	2021		2020		2019
Balance, beginning of year	$	27.1	$	48.6	$	58.2
ASU 2016-13 cumulative transition adjustment	8.2		—		—
Adjusted balance, beginning of year	35.3		48.6		58.2
Provision for (recovery of) bad debts	10.4		13.0		(9.8)
Allowance charge-offs	(5.9)		(35.6)		(1.3)
Other(1)	—		1.1		1.5
Balance, end of year	$	39.8	$	27.1	$	48.6
(1) Allowance increase is related to a recoverable amount due from an affiliated party and recorded in Other assets on the Consolidated Balance Sheets.