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Receivables - Schedule of Receivables (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Receivables [Abstract]            
Trade receivables - U.S. government $ 240.1   $ 105.8      
Trade receivables - other 811.3   734.0      
Finance receivables 7.4   18.8      
Other receivables 26.5   17.1      
Receivables, gross 1,085.3   875.7      
Less allowance for doubtful accounts (4.7) $ (5.7) (9.6) $ (11.1) $ (13.0) $ (11.3)
Receivables, net $ 1,080.6   $ 866.1