Basis Of Presentation And Significant Accounting Policies (Summary Of Transactions Related Charges) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Business Acquisition [Line Items]
Total transaction-related charges	$ 5.3	$ 9.6	$ 11.6	$ 14.9
HHI Integration [Member]
Business Acquisition [Line Items]
Total transaction-related charges	0.4	1.9	0.9	4.6
PetMatrix Integration [Member]
Business Acquisition [Line Items]
Total transaction-related charges		2.1		3.7
HPC Divestiture [Member]
Business Acquisition [Line Items]
Total transaction-related charges	0.9	5.4	5.5	5.4
GBL Post Divestiture Separation [Member]
Business Acquisition [Line Items]
Total transaction-related charges	2.5		2.5
GAC Post Divestiture Separation [Member]
Business Acquisition [Line Items]
Total transaction-related charges	0.4		0.4
Other Integration [Member]
Business Acquisition [Line Items]
Total transaction-related charges	$ 1.1	$ 0.2	$ 2.3	$ 1.2