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Receivables - Schedule of Receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Receivables [Abstract]        
Trade receivables - U.S. government $ 140.7 $ 133.5    
Trade receivables - other 797.5 849.2    
Finance receivables 8.0 6.4    
Other receivables 40.0 39.3    
Receivables, gross 986.2 1,028.4    
Less allowance for doubtful accounts (4.2) (3.6) $ (5.8) $ (9.6)
Receivables, net $ 982.0 $ 1,024.8