Restructuring And Related Charges (Summary Of Costs Incurred And Cumulative Costs By Cost Type) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	$ 12.6	$ 20.3	$ 21.5	$ 37.5
Cumulative costs	109.4		109.4
Future costs to be incurred	11.1		11.1
Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	2.1	3.7	3.6	5.4
Cumulative costs	6.3		6.3
Future costs to be incurred	1.6		1.6
Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	10.5	$ 16.6	17.9	$ 32.1
Cumulative costs	103.1		103.1
Future costs to be incurred	$ 9.5		$ 9.5