Acquisition - Narrative (Details) $ / shares in Units, € in Millions, shares in Millions, $ in Millions					3 Months Ended		12 Months Ended
	Jan. 02, 2020 EUR (€)	Jan. 28, 2019 USD ($) $ / shares shares	Jan. 02, 2019 USD ($)	Nov. 15, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2019 USD ($)
Business Acquisition [Line Items]
Payments to acquire business					$ 3.6	$ 0.0
Write down of assets of business held for sale						107.2
Gain on sale of assets					(1.0)	0.0
Earnings related to transition service agreements					(0.3)	0.0
Gain (Loss) Recognized in Income					2.2	9.0
Interest income on restricted cash					0.0	5.8
Research and Development Expense
Business Acquisition [Line Items]
Acquisition and integration costs					0.4
Interest Expense
Business Acquisition [Line Items]
Interest and other financing items						32.4
Other Items, Net
Business Acquisition [Line Items]
Pre-tax expenses					0.9
Pre-tax income						(14.8)
Interest income on restricted cash						(5.8)
Costs of products sold
Business Acquisition [Line Items]
Acquisition and integration costs					6.9
Spectrum Brands Holdings
Business Acquisition [Line Items]
Payments to acquire business			$ 2,000.0
Initial cash paid including estimated working capital adjustments			1,962.4
Cash consideration initially allocated to divested business			400.0
Inventory adjustment							$ 14.6
Inventory fair value adjustment					11.2
Net assets acquired			$ 1,962.4
Net sales					125.5
Earnings before income taxes					17.1
Spectrum Auto Care Acquisition
Business Acquisition [Line Items]
Payments to acquire business				$ 937.5
Initial cash paid including estimated working capital adjustments		$ 938.7
Inventory adjustment							$ 21.6
Acquisition purchase price				1,250.0
Newly-issued common stock in acquisition		$ 5.3		$ 312.5
Newly-issued common stock in acquisition (in shares) | shares		5.3
Fair value of equity consideration		$ 240.5
Opening stock price (in dollars per share) | $ / shares		$ 45.55
Net assets acquired		$ 1,182.8
Net sales					61.4
Earnings before income taxes					0.4
Batter Acquisition and Auto Care Acquisition
Business Acquisition [Line Items]
Acquisition and integration costs					19.3	36.5
Batter Acquisition and Auto Care Acquisition | Selling, General and Administrative Expenses
Business Acquisition [Line Items]
Acquisition and integration costs					$ 11.1	18.9
USD Restricted Cash Held in European Euro Functional Entity | Other Items, Net
Business Acquisition [Line Items]
Favorable movement in escrowed USD restricted cash						$ (9.0)
Subsequent Event | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Business Acquisition [Line Items]
Initial cash proceeds | €	€ 180.0