CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Income Statement [Abstract]
Net Sales	$ 2,907.0	$ 3,238.0	$ 3,645.6
Cost of Sales	2,098.3	2,377.3	2,681.0
Gross Profit	808.7	860.7	964.6
Operating Expenses	512.9	544.3	599.4
Goodwill Impairment	10.5	0.0	9.5
Asset Impairments	5.3	10.0	8.7
Gain on Sale of Businesses	(0.1)	(44.7)	0.0
Total Operating Expenses	528.6	509.6	617.6
Income from Operations	280.1	351.1	347.0
Other (Income) Expenses, net	(4.4)	(0.1)	1.5
Interest Expense	39.8	53.0	55.2
Interest Income	5.9	5.6	1.9
Total	250.6	303.8	292.2
Provision for Income Taxes	56.8	61.2	56.4
Net Income	193.8	242.6	235.8
Less: Net Income Attributable to Noncontrolling Interests	4.5	3.7	4.6
Net Income Attributable to Regal Beloit Corporation	$ 189.3	$ 238.9	$ 231.2
Earnings Per Share Attributable to Regal Beloit Corporation:
Basic (in dollars per share)	$ 4.66	$ 5.69	$ 5.30
Assuming Dilution (in dollars per share)	$ 4.64	$ 5.66	$ 5.26
Weighted Average Number of Shares Outstanding:
Basic (in shares)	40.6	42.0	43.6
Assuming Dilution (in shares)	40.8	42.2	43.9