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Receivables - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Receivables [Line Items]
Allowance for uncollectible receivables	$ 6.4	$ 4.9	$ 4.0	$ 6.1
Aggregate gross amount factored, trade receivable	1,554.5	1,649.3	1,675.3
Factoring costs	$ 5.7	$ 9.4	$ 9.4
Two Customers | Trade Receivable | Customer Concentration Risk
Receivables [Line Items]
Concentration risk	28.00%
Three Customers | Trade Receivable | Customer Concentration Risk
Receivables [Line Items]
Concentration risk		30.00%

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Factoring Costs Trade Receivables

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Transfers Of Servicing And Financial Assets Gross Sales Of Trade Receivables

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Amount of allowance for credit loss on accounts receivable.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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