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Receivables (Narrative) (Details)
$ in Millions
12 Months Ended
Sep. 30, 2018
USD ($)
customer
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Receivables and Concentration of Credit Risk [Line Items]        
Allowance for uncollectible receivables $ 26.9 $ 23.5 $ 21.3 $ 15.8
Aggregate gross amount factored, trade receivable 1,283.8 1,158.2 1,087.3  
Factoring costs $ 11.4 $ 7.6 $ 6.2  
Major Customer Three [Member] | Sales Revenue Net And/Or Trade Accounts Receivable [Member]        
Receivables and Concentration of Credit Risk [Line Items]        
Number of major customers accounting for a significant percentage of sales volume | customer 3      
Major Customer Three [Member] | Sales Revenue Net And/Or Trade Accounts Receivable [Member] | Minimum [Member]        
Receivables and Concentration of Credit Risk [Line Items]        
Concentration risk 10.00%      
Major Customer Three [Member] | Net Sales [Member]        
Receivables and Concentration of Credit Risk [Line Items]        
Concentration risk 38.00% 38.00% 37.00%  
Major Customer Three [Member] | Trade Receivable [Member]        
Receivables and Concentration of Credit Risk [Line Items]        
Concentration risk 35.00% 36.00%