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Supplemental Information (Other Receivables and Current Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Disclosure Text Block Supplement [Abstract]    
Contract assets $ 55.9 $ 64.3
Contract fulfillment costs 109.9 64.5
Derivative instruments 97.5 142.5
Current lease receivables 86.7  
Current lease receivables   90.9
Other 132.9 115.5
Other receivables and current assets $ 482.9 $ 477.7