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RECEIVABLES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Receivables [Line Items]
Allowance for uncollectible receivables	$ 6.7	$ 5.3	$ 3.5	$ 3.0
Aggregate gross amount factored, trade receivable	1,328.7	1,206.5	1,222.3
Factoring costs	$ 3.5	$ 4.8	$ 7.4
One Customer | Trade Receivable | Customer Concentration Risk
Receivables [Line Items]
Concentration risk	14.70%
Two Customers | Trade Receivable | Customer Concentration Risk
Receivables [Line Items]
Concentration risk		33.20%

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