Goodwill And Intangible Assets (Schedule Of Carrying Value And Accumulated Amortization For Intangible Assets) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 868.5	$ 884.8
Accumulated Amortization	(325.5)	(297.1)
Net	543.0	587.7
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	668.1	671.7
Accumulated Amortization	(249.3)	(222.3)
Net	418.8	449.4
Technology Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	194.6	194.6
Accumulated Amortization	(73.1)	(59.7)
Net	121.5	134.9
Tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5.8	18.5
Accumulated Amortization	(3.1)	(15.1)
Net	$ 2.7	$ 3.4