CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Income Statement [Abstract]
Net Sales	$ 758.2	$ 772.3	$ 2,126.5	$ 2,499.8
Cost of Sales	536.6	570.4	1,531.3	1,829.3
Gross Profit	221.6	201.9	595.2	670.5
Operating Expenses	131.6	128.9	385.1	416.3
Gain (Loss) on Divestiture of Businesses	0.0	0.2	(0.1)	(45.2)
Asset Impairments	0.0	0.0	4.3	10.0
Total Operating Expenses	131.6	129.1	389.3	381.1
Income from Operations	90.0	72.8	205.9	289.4
Other (Income) Expenses, net	(1.1)	0.1	(3.3)	0.4
Interest Expense	9.0	13.5	31.2	40.5
Interest Income	1.3	1.5	3.8	4.0
Income before Taxes	83.4	60.7	181.8	252.5
Provision for Income Taxes	17.1	9.9	39.5	47.5
Net Income	66.3	50.8	142.3	205.0
Less: Net Income Attributable to Noncontrolling Interests	1.3	1.1	3.4	2.8
Net Income Attributable to Regal Beloit Corporation	$ 65.0	$ 49.7	$ 138.9	$ 202.2
Earnings Per Share Attributable to Regal Beloit Corporation:
Basic (in dollars per share)	$ 1.60	$ 1.20	$ 3.42	$ 4.78
Assuming Dilution (in dollars per share)	$ 1.60	$ 1.19	$ 3.41	$ 4.75
Weighted Average Number of Shares Outstanding:
Basic (in shares)	40.6	41.5	40.6	42.3
Assuming Dilution (in shares)	40.8	41.7	40.7	42.6