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Receivables - Schedule of Classification of Receivables in the Condensed Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Sep. 30, 2020
Classification of receivables    
Current receivables $ 1,072.5 $ 857.6
Long-term receivables 8.1 8.5
Receivables, net $ 1,080.6 $ 866.1