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Receivables (Narrative) (Details) $ in Millions	12 Months Ended
	Sep. 30, 2019 USD ($) customer	Sep. 30, 2018 USD ($) customer	Sep. 30, 2017 USD ($) customer	Sep. 30, 2016 USD ($)
Receivables [Line Items]
Allowance for uncollectible receivables	$ 4.9	$ 4.0	$ 6.1	$ 5.7
Aggregate gross amount factored, trade receivable	1,649.3	1,675.3	1,627.8
Factoring costs	$ 9.4	$ 9.4	$ 7.7
Major Customer Three [Member] | Net Sales And/Or Trade Receivables [Member]
Receivables [Line Items]
Number of major customers accounting for a significant percentage of sales volume | customer	3	3	3
Major Customer Three [Member] | Net Sales And/Or Trade Receivables [Member] | Minimum [Member]
Receivables [Line Items]
Concentration risk	10.00%	10.00%	10.00%
Major Customer Three [Member] | Net Sales [Member]
Receivables [Line Items]
Concentration risk	34.40%	31.30%	34.70%
Major Customer Three [Member] | Trade Receivable [Member]
Receivables [Line Items]
Concentration risk	29.90%	37.20%

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