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Supplemental Information (Other Noncurrent Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Oct. 01, 2018
Sep. 30, 2018
Disclosure Text Block Supplement [Abstract]      
Pension benefits $ 651.2   $ 417.2
Postretirement benefits 36.0   47.0
Noncurrent customer liability 118.0   92.4
Long-term accrued income taxes related to U.S. tax reform 215.4   184.4
Contingencies related to uncertain tax positions 123.3   113.2
Contract liabilities 49.2 $ 53.5 58.2
Environmental liabilities 59.1   64.6
Derivative instruments 21.2   39.9
Asset retirement obligations 201.9   189.5
Obligation for future contribution to an equity affiliate 0.0   94.4
Obligations associated with EfW 57.8   63.3
Other 179.3   172.8
Other noncurrent liabilities $ 1,712.4   $ 1,536.9