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Receivables - Schedule of Receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Receivables [Abstract]        
Trade receivables - U.S. government $ 111.9 $ 61.8    
Trade receivables - other 774.3 997.7    
Finance receivables 12.0 13.1    
Notes receivable 0.4 0.4    
Other receivables 33.5 32.0    
Receivables, gross 932.1 1,105.0    
Less allowance for doubtful accounts (9.7) (11.3) $ (10.5) $ (9.9)
Receivables, net $ 922.4 $ 1,093.7