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. 29, 2020	Mar. 31, 2019	Mar. 29, 2020	Mar. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	$ 21.9	$ 12.6	$ 49.4	$ 21.5
Cumulative costs	101.7		101.7
Future costs to be incurred	89.4		89.4
Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	6.2	2.1	11.4	3.6
Cumulative costs	18.6		18.6
Future costs to be incurred	3.8		3.8
Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	15.7	$ 10.5	38.0	$ 17.9
Cumulative costs	83.1		83.1
Future costs to be incurred	$ 85.6		$ 85.6