Restructuring And Related Charges (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Global Productivity Improvement Plan [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring and related charges		$ 60.9
Global Productivity Improvement Plan [Member] | Forecast [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring and related charges	$ 88.9
HHI Distribution Center Consolidation [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring and related charges				$ 81.7
GPC Rightsizing Initiative [Member]
Restructuring Cost and Reserve [Line Items]
Expected restructuring and related charges			$ 20.3