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Receivables - Schedule of Classification of Receivables in the Condensed Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Sep. 30, 2019
Classification of receivables    
Current receivables $ 831.6 $ 1,082.3
Long-term receivables 36.5 11.4
Receivables, net $ 868.1 $ 1,093.7