Restructuring And Related Charges (Summary Of Costs Incurred And Cumulative Costs By Cost Type) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	$ 25.4	$ 21.2	$ 69.0	$ 31.3
Cumulative costs	134.6		134.6
Future costs to be incurred	16.4		16.4
Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	1.6	2.4	6.8	4.5
Cumulative costs	17.8		17.8
Future costs to be incurred	0.4		0.4
Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	23.8	$ 18.8	62.2	$ 26.8
Cumulative costs	116.8		116.8
Future costs to be incurred	$ 16.0		$ 16.0