Acquisition - Provisional Information (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]
Inventory adjustment	$ 22.5	$ 0.0	$ 22.0	$ (26.5)
Cost of products sold
Business Acquisition [Line Items]
Inventory adjustment			27.2
Spectrum Brands Holdings
Business Acquisition [Line Items]
Net sales			99.9
Inventory adjustment			14.2
Loss before income taxes			(1.1)
Spectrum Auto Care Acquisition
Business Acquisition [Line Items]
Net sales			84.5
Inventory adjustment	$ 19.5
Loss before income taxes			(0.8)
Spectrum Auto Care Acquisition | Cost of products sold
Business Acquisition [Line Items]
Inventory adjustment			$ 13.0