Held For Sale, Divestitures and Acquisitions (Schedule of 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
Earnings Per Share Attributable to Regal Rexnord Corporation:
Basic (in dollars per share)	$ 5.13	$ 1.25
Diluted (in dollars per share)	$ 5.09	$ 1.25
Acquisition-related Costs
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues	$ 64.4	$ 64.4
Fair Value Adjustment to Inventory
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues	$ 26.9	$ 24.1

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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