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Supplemental Information (Other Noncurrent Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2022
Disclosure Text Block Supplement [Abstract]    
Asset retirement obligations $ 285.1 $ 265.0
Pension benefits 192.3 190.0
Postretirement benefits 10.3 15.0
Derivative instruments 112.7 138.2
Long-term accrued income taxes related to U.S. tax reform 109.4 134.6
Contingencies related to uncertain tax positions 89.6 95.6
Contract liabilities 136.9 67.2
Environmental liabilities 50.2 61.8
Other 131.5 131.7
Other noncurrent liabilities $ 1,118.0 $ 1,099.1