Goodwill And Intangible Assets (Schedule Of Carrying Value And Accumulated Amortization For Intangible Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,032.4	$ 1,036.0
Accumulated Amortization	(508.9)	(458.6)
Net	523.5	577.4
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	697.9	701.3
Accumulated Amortization	(312.4)	(275.3)
Net	385.5	426.0
Technology Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	181.3	181.5
Accumulated Amortization	(84.9)	(78.2)
Net	96.4	103.3
Tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	153.2	153.2
Accumulated Amortization	(111.6)	(105.1)
Net	$ 41.6	$ 48.1