CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Income Statement [Abstract]
Net Sales	$ 886.9	$ 634.1	$ 1,701.0	$ 1,368.3
Cost of Sales	635.4	463.8	1,204.1	994.7
Gross Profit	251.5	170.3	496.9	373.6
Operating Expenses	140.2	121.6	288.5	253.5
Gain on Divestiture of Businesses	0.0	0.0	0.0	(0.1)
Asset Impairments	2.3	2.8	2.3	4.3
Total Operating Expenses	142.5	124.4	290.8	257.7
Income from Operations	109.0	45.9	206.1	115.9
Other Income, Net	(1.2)	(1.1)	(2.4)	(2.2)
Interest Expense	11.5	10.6	24.1	22.2
Interest Income	(1.7)	(1.4)	(3.2)	(2.5)
Income before Taxes	100.4	37.8	187.6	98.4
Provision for Income Taxes	19.2	8.5	39.4	22.4
Net Income	81.2	29.3	148.2	76.0
Less: Net Income Attributable to Noncontrolling Interests	1.6	1.2	3.0	2.1
Net Income Attributable to Regal Beloit Corporation	$ 79.6	$ 28.1	$ 145.2	$ 73.9
Earnings Per Share Attributable to Regal Beloit Corporation:
Basic (in dollars per share)	$ 1.96	$ 0.69	$ 3.57	$ 1.82
Assuming Dilution (in dollars per share)	$ 1.94	$ 0.69	$ 3.54	$ 1.81
Weighted Average Number of Shares Outstanding:
Basic (in shares)	40.7	40.5	40.6	40.6
Assuming Dilution (in shares)	41.0	40.7	41.0	40.7