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Receivables - Schedule of Classification of Receivables in the Condensed Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Sep. 30, 2021
Classification of receivables    
Current receivables $ 973.4 $ 1,017.3
Long-term receivables 8.6 7.5
Receivables, net $ 982.0 $ 1,024.8