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Receivables - Schedule of Receivables (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Receivables [Abstract]      
Trade receivables - U.S. government $ 133.5 $ 105.8  
Trade receivables - other 849.2 734.0  
Finance receivables 6.4 18.8  
Other receivables 39.3 17.1  
Receivables, gross 1,028.4 875.7  
Less allowance for doubtful accounts (3.6) (9.6) $ (11.3)
Receivables, net $ 1,024.8 $ 866.1