Supplemental Information (Payables and Accrued Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Supplemental Information [Abstract]
Trade creditors	$ 638.9	$ 740.6
Customer advances	195.3	172.1
Accrued payroll and employee benefits	247.8	155.0
Pension and postretirement benefits	26.1	48.4
Dividends payable	174.4	164.1
Outstanding payments in excess of certain cash balances	27.5	28.0
Accrued interest expense	52.9	46.9
Derivative instruments	114.6	82.5
Severance and other costs associated with business restructuring and cost reduction actions	41.7	20.6
Other	143.2	132.8
Payables and accrued liabilities total	$ 1,662.4	$ 1,591.0