Restructuring And Related Charges (Summary Of Restructuring And Related Charges) (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
Global Productivity Improvement Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	60.9
HHI Distribution Center Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	2.3	52.0	27.4
GPC Rightsizing Initiative [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges		12.1	8.2
Other Restructuring Activities [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	2.5	11.5	1.9
Cost of Goods Sold [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	2.8	3.6	0.5
Operating Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges	$ 62.9	$ 72.0	$ 37.0