Related Party Transactions (Details) - USD ($)		3 Months Ended			9 Months Ended
	Nov. 15, 2018	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019
Related Party Transaction [Line Items]
Selling, general and administrative expense		$ 112,800,000		$ 127,600,000	$ 351,000,000.0	$ 373,500,000
Cost of products sold		394,800,000		400,900,000	1,181,700,000	1,059,500,000
Earnings related to transition service agreements		(400,000)		(700,000)	(800,000)	(800,000)
Total Other items, net		(700,000)		800,000	(5,800,000)	13,900,000
Due to Spectrum		1,100,000			1,100,000		$ 2,600,000
Due from Spectrum		16.8			16.8
Net (loss)/earnings		29,800,000		7,400,000	(41,800,000)	4,900,000
Discontinued Operations
Related Party Transaction [Line Items]
TSA income				(4,000,000.0)	(3,800,000)	(8,100,000)
Other items, net				300,000	300,000	1,000,000.0
Transition Services Agreement
Related Party Transaction [Line Items]
Selling, general and administrative expense		1,200,000		5,700,000	7,500,000	10,700,000
Cost of products sold		100,000		300,000	400,000	700,000
Expense resulting from supply agreement		3,900,000		$ 4,800,000	13,300,000	$ 9,200,000
Transition Services Agreement | Accounts Payable
Related Party Transaction [Line Items]
Expense resulting from supply agreement			$ 100,000		1,500,000
Transition Services Agreement | Discontinued Operations
Related Party Transaction [Line Items]
Payable to related party							22,500,000
Receivable recorded in assets held for sale							$ 8,900,000
Spectrum Brands Holdings
Related Party Transaction [Line Items]
Payments for rent		$ 600,000			1,700,000
Spectrum Auto Care Acquisition
Related Party Transaction [Line Items]
Newly-issued common stock in acquisition	$ 312,500,000				$ 2,000,000.0
Percentage of common stock owned		2.90%			2.90%