Restructuring And Related Charges (Summary Of Costs Incurred By Reporting Segment) (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
Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	43.5
Cumulative costs	42.5	8.1
Future costs to be incurred	65.6		1.8
Hardware & Home Improvement [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	4.7
Cumulative costs	1.0	52.8
Future costs to be incurred	1.6		26.6
Home And Personal Care [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	8.1
Cumulative costs	8.1	0.7
Future costs to be incurred	4.7
Global Pet Supplies [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	7.6
Cumulative costs	7.6	13.2
Future costs to be incurred	16.8		$ 9.1
Home And Garden [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	1.8
Cumulative costs	1.7	$ 0.8
Future costs to be incurred	$ 0.2