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Receivables - Schedule of Receivables (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Receivables [Abstract]            
Trade receivables - U.S. government $ 154.7   $ 61.8      
Trade receivables - other 657.5   997.7      
Finance receivables 46.5   13.1      
Notes receivable     0.4      
Other receivables 20.5   32.0      
Receivables, gross 879.2   1,105.0      
Less allowance for doubtful accounts (11.1) $ (13.0) (11.3) $ (11.5) $ (11.2) $ (9.9)
Receivables, net $ 868.1   $ 1,093.7