Restructuring And Related Charges (Summary Of Costs Incurred And Cumulative Costs By Cost Type) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	$ 65.7	$ 75.6	$ 37.5
Cumulative costs	60.9	75.6
Future costs to be incurred	88.9		37.5
Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	9.8	7.8	8.0
Cumulative costs	9.7
Future costs to be incurred	12.9
Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	55.9	$ 67.8	$ 29.5
Cumulative costs	51.2
Future costs to be incurred	$ 76.0