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Supplemental Information (Other Noncurrent Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Sep. 30, 2014
Liabilities, Noncurrent [Abstract]    
Pension benefits $ 860.0 $ 609.2
Postretirement benefits 76.5 82.8
Other employee benefits 106.7 107.6
Contingencies related to uncertain tax positions 91.1 111.6
Advance payments 135.1 57.6
Environmental liabilities 71.6 78.4
Derivative instruments 10.6 3.4
Asset retirement obligations 106.5 94.0
Obligation for future contribution to equity affiliate 67.5 0.0
Other 30.9 42.9
Other noncurrent liabilities total $ 1,556.5 $ 1,187.5