Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Sep. 30, 2020
Related Party Transaction [Line Items]
Selling, general and administrative expense	$ 124.1	$ 122.1
Cost of products sold	510.7	435.5
Earnings related to transition service agreements	0.0	(0.3)
Total Other items, net	(0.8)	0.0
Net earnings	67.1	46.1
Discontinued Operations
Related Party Transaction [Line Items]
TSA income	3.8
Other items, net	(0.3)
Transition Services Agreement
Related Party Transaction [Line Items]
Selling, general and administrative expense		4.4
Cost of products sold		0.2
Total Other items, net		(0.3)
Expense resulting from supply agreement	2.4	4.8
Transition Services Agreement | Accounts Payable
Related Party Transaction [Line Items]
Expense resulting from supply agreement	1.3	2.7
Spectrum Brands Holdings
Related Party Transaction [Line Items]
Payments for rent	0.6	$ 0.6
Spectrum Brands Holdings | Transition Services Agreement
Related Party Transaction [Line Items]
Payable to related party			$ 1.6
Spectrum Brands Holdings | Transition Services Agreement | Other Assets
Related Party Transaction [Line Items]
Due from Spectrum	18.4		$ 18.4
Spectrum Auto Care Acquisition
Related Party Transaction [Line Items]
Newly-issued common stock in acquisition	$ 0.3
Percentage of common stock owned	0.40%