Supplemental Information (Other Noncurrent Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Liabilities, Noncurrent [Abstract]
Pension benefits	$ 609.2	$ 599.0
Postretirement benefits	82.8	89.0
Other employee benefits	107.6	114.3
Contingencies related to uncertain tax positions	111.6	94.2
Advance payments	57.6	31.0
Environmental liabilities	78.4	79.6
Derivative instruments	3.4	13.8
Asset retirement obligation	94.0	86.0
Other	42.9	57.4
Other noncurrent liabilities total	$ 1,187.5	$ 1,164.3