Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Income Statement [Abstract]
Net Sales	$ 14,534.6	$ 14,442.2	$ 13,982.4
Costs and Expenses
Cost of sales	9,566.7	9,636.7	9,131.3
Selling, general and administrative	3,048.5	3,008.0	3,143.7
Provision for credit losses	41.1	33.0	28.0
Other, net	262.8	249.1	287.0
Loss (gain) on sales of businesses	13.5	(17.0)	0.8
Restructuring charges	83.0	154.1	160.3
Loss on debt extinguishments	46.9	17.9	0.0
Interest income	(18.0)	(53.9)	(68.7)
Interest expense	223.1	284.3	277.9
Costs and Expenses, Total	13,267.6	13,312.2	12,960.3
Earnings before income taxes and equity interest	1,267.0	1,130.0	1,022.1
Income taxes	41.4	160.8	416.3
Net earnings before equity interest	1,225.6	969.2	605.8
Share of net earnings (losses) of equity method investment	9.1	(11.2)	0.0
Net earnings	1,234.7	958.0	605.8
Less: Net earnings attributable to non-controlling interests	0.9	2.2	0.6
Net earnings attributable to Stanley Black & Decker, Inc.	1,210.4	955.8	605.2
Less: Preferred stock dividends	23.4	0.0	0.0
Net Earnings Attributable to Common Shareowners	$ 1,233.8	$ 955.8	$ 605.2
Earnings per share of common stock:
Basic (in dollars per share)	$ 7.85	$ 6.44	$ 4.06
Diluted (in dollars per share)	$ 7.77	$ 6.35	$ 3.99