CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Income Statement [Abstract]
Net Sales	$ 634.1	$ 873.7	$ 1,368.3	$ 1,727.5
Cost of Sales	463.8	639.7	994.7	1,258.9
Gross Profit	170.3	234.0	373.6	468.6
Operating Expenses	121.6	142.2	253.5	287.4
Gain on Divestiture of Businesses	0.0	(4.2)	(0.1)	(45.4)
Asset Impairments	2.8	0.0	4.3	10.0
Total Operating Expenses	124.4	138.0	257.7	252.0
Other (Income) Expenses, net	45.9	96.0	115.9	216.6
Other (Income) Expenses, net	(1.1)	0.2	(2.2)	0.3
Interest Expense	10.6	13.4	22.2	27.0
Interest Income	1.4	1.4	2.5	2.5
Income before Taxes	37.8	83.8	98.4	191.8
Provision for Income Taxes	8.5	16.4	22.4	37.6
Net Income	29.3	67.4	76.0	154.2
Less: Net Income Attributable to Noncontrolling Interests	1.2	0.8	2.1	1.7
Net Income Attributable to Regal Beloit Corporation	$ 28.1	$ 66.6	$ 73.9	$ 152.5
Earnings Per Share Attributable to Regal Beloit Corporation:
Basic (in dollars per share)	$ 0.69	$ 1.56	$ 1.82	$ 3.57
Assuming Dilution (in dollars per share)	$ 0.69	$ 1.55	$ 1.81	$ 3.54
Weighted Average Number of Shares Outstanding:
Basic (in shares)	40.5	42.6	40.6	42.7
Assuming Dilution (in shares)	40.7	43.0	40.7	43.0