CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions	3 Months Ended
	Apr. 03, 2021	Mar. 28, 2020
Income Statement [Abstract]
Net Sales	$ 814,100,000	$ 734,200,000
Cost of Sales	568,700,000	530,900,000
Gross Profit	245,400,000	203,300,000
Operating Expenses	148,300,000	131,900,000
Gain on Divestiture of Businesses	0	(100,000)
Asset Impairments	0	1,500,000
Total Operating Expenses	148,300,000	133,300,000
Income from Operations	97,100,000	70,000,000.0
Other Income, Net	(1,200,000)	(1,100,000)
Interest Expense	12,600,000	11,600,000
Interest Income	(1,500,000)	(1,100,000)
Income before Taxes	87,200,000	60,600,000
Provision for Income Taxes	20,200,000	13,900,000
Net Income	67,000,000.0	46,700,000
Less: Net Income Attributable to Noncontrolling Interests	1,400,000	900,000
Net Income Attributable to Regal Beloit Corporation	$ 65,600,000	$ 45,800,000
Earnings Per Share Attributable to Regal Beloit Corporation:
Basic (in dollars per share)	$ 1.62	$ 1.13
Assuming Dilution (in dollars per share)	$ 1.60	$ 1.12
Weighted Average Number of Shares Outstanding:
Basic (in shares)	40.6	40.6
Assuming Dilution (in shares)	41.0	40.8