Business Segment Information (Reconciliation of Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Total Assets	$ 18,055.3	$ 17,334.5	$ 17,668.3
Segment Total [Member]
Segment Reporting Information [Line Items]
Total Assets	18,035.9	16,440.9	17,076.9
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Assets of discontinued operations	$ 19.4	$ 893.6	$ 591.4