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Supplemental Information (Other Noncurrent Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Liabilities, Noncurrent [Abstract]    
Pension benefits $ 1,155.1 $ 860.0
Postretirement benefits 74.9 76.5
Other employee benefits 104.1 104.3
Contingencies related to uncertain tax positions 78.0 76.4
Advance payments 43.8 135.3
Environmental liabilities 70.3 71.6
Derivative instruments 21.8 10.6
Asset retirement obligations 116.1 105.6
Obligation for future contribution to equity affiliate 94.4 67.5
Other 58.0 21.8
Other noncurrent liabilities total $ 1,816.5 $ 1,529.6