Allowance for Doubtful Accounts (Tables)

12 Months Ended

Sep. 30, 2023

Receivables [Abstract]

Schedule of Allowance for Doubtful Accounts

Activity in the allowance for doubtful accounts for the years ended September 30, 2023, 2022, and 2021 was as follows:

(in millions)	2023		2022		2021
Balance, beginning of year	$	47.8	$	39.8	$	27.1
ASU 2016-13 cumulative transition adjustment	—		—		8.2
Adjusted balance, beginning of year	47.8		39.8		35.3
Provision for bad debts(1)	12.5		12.4		10.4
Allowance charge-offs	(0.5)		(5.6)		(5.9)
Other(2)	0.1		1.2		—
Balance, end of year	$	59.9	$	47.8	$	39.8
(1) An additional $4.0 million is included in bad debt expense for the year ended September 30, 2023 on the consolidated income statement, which is not included in the allowance at the year then ended.
(2) Allowance increase is related to a recoverable amount due from an affiliated party and recorded in Other assets on the Consolidated Balance Sheets.