Retirement Benefits (Narrative) (Details) - Defined Benefit Plans and Other Postretirement Benefit Plans [Domain] - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Sep. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Settlement loss	$ 1.6	$ 0.0	$ 14.2	$ 0.0
Company contributions			119.2	$ 64.7	$ 78.2
Business Realignment and Reorganization [Member]
Defined Benefit Plan Disclosure [Line Items]
Special termination benefits	0.8		6.5
Curtailment losses	$ 1.7		4.8
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Total expected contributions for current fiscal year			130.0
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Total expected contributions for current fiscal year			$ 150.0