Supplemental Information (Payables and Accrued Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Sep. 30, 2015
Supplemental Information [Abstract]
Trade creditors	$ 676.1	$ 621.9
Customer advances	376.1	195.3
Accrued payroll and employee benefits	262.6	272.9
Pension and postretirement benefits	35.5	26.1
Dividends payable	186.9	174.4
Outstanding payments in excess of certain cash balances	11.9	27.5
Accrued interest expense	47.9	52.9
Derivative instruments	74.0	114.6
Severance and other costs associated with business restructuring and cost reduction actions	16.3	41.7
Other	123.3	114.4
Payables and accrued liabilities total	$ 1,810.6	$ 1,641.7