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Supplemental Information (Other Noncurrent Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Disclosure Text Block Supplement [Abstract]    
Operating lease right-of-use assets $ 566.2 $ 376.8
Pension benefits 219.2 26.5
Long-term deposits on plant and equipment 200.0 100.0
Deferred tax assets 100.2 115.1
Prepaid tax 75.0 19.3
Other Long-term Investments 66.9 17.0
Derivative instruments 23.6 45.8
Other 255.4 242.6
Other noncurrent assets $ 1,506.5 $ 943.1