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Supplemental Information (Other Noncurrent Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Disclosure Text Block Supplement [Abstract]    
Pension benefits $ 614.2 $ 651.2
Postretirement benefits 31.4 36.0
Operating lease liabilities 335.8  
Asset retirement obligations 236.2 201.9
Long-term accrued income taxes related to U.S. tax reform 190.9 215.4
Contingencies related to uncertain tax positions 138.6 123.3
Environmental liabilities 73.6 59.1
Contract liabilities 57.9 49.2
Derivative instruments 34.7 21.2
Noncurrent customer liability 0.0 118.0
Obligations associated with Energy-from-Waste 0.0 57.8
Other 202.7 179.3
Other noncurrent liabilities $ 1,916.0 $ 1,712.4