Held for Sale, Acquisitions and Divestitures (Rexnord Pro Forma Information) (Details) - Merger Agreement - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jan. 01, 2022	Jan. 02, 2021
Business Acquisition [Line Items]
Net Sales	$ 4,780.7	$ 4,136.8
Net Income Attributable to Regal Rexnord Corporation	$ 347.3	$ 84.8
Basic (in dollars per share)	$ 5.13	$ 1.25
Diluted (in dollars per share)	$ 5.09	$ 1.25
Transaction Costs and Other One Time Non Recurring Costs
Business Acquisition [Line Items]
Revenues	$ 64.4
Inventory Valuation Adjustment
Business Acquisition [Line Items]
Revenues	$ 24.1