Retirement Benefits (Amounts recognized in balance sheet) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	$ 22.9	$ 20.5
Accrued liabilities	48.4	25.6
US [Member]
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	22.7	19.4
Accrued liabilities	37.7	14.7
Noncurrent liabilities	241.7	279.5
Net Amount Recognized	(256.7)	(274.8)
International [Member]
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	0.2	1.1
Accrued liabilities	0	0
Noncurrent liabilities	367.5	319.5
Net Amount Recognized	(367.3)	(318.4)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Accrued liabilities	10.7	10.9
Noncurrent liabilities	$ 82.8	$ 89.0