INCOME TAXES - Income Tax Expense (Benefit) Attributable to Continuing Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Income Tax Examination, Increase (Decrease) in Liability from Prior Year	$ 10.6
Deferred Tax Assets, Capital Loss Carryforwards	21.3
Income (Loss) from Continuing Operations before Income Taxes, Domestic	444.1	$ 715.2	$ 307.1
Valuation allowance	626.7	516.7
Undistributed Earnings, Basic	5,500.0
Income Taxes Paid, Net	339.4	273.6	233.3
Current:
Federal	25.4	590.6	84.8
Foreign	175.0	224.6	191.5
State	24.8	25.4	10.6
Total current	225.2	840.6	286.9
Deferred:
Federal	29.7	(513.0)	18.7
Foreign	132.7	(33.0)	(26.1)
State	28.7	6.3	(17.8)
Total deferred	191.1	(103.0)	(25.7)
Income taxes	416.3	300.9	261.7
Income Tax Refund	43.7	28.5	30.5
Income (Loss) from Continuing Operations before Income Taxes, Foreign	578.0	812.6	922.2
Earnings before income taxes	1,022.1	1,527.8	1,229.3
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Income Tax Expense (Benefit)		252.5
Continuing Operations [Member]
Deferred:
Total deferred	191.1	$ (539.7)	$ (25.2)
The Black & Decker Corporation
Undistributed Earnings, Basic	$ 202.5