OTHER FINANCIAL INFORMATION (Condensed Financial Statements) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022	Apr. 03, 2021	Jan. 01, 2022	Jan. 02, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Sales	$ 876.6	$ 564.3
Provision for Income Taxes	36.2	21.3
Net income attributable to Regal Rexnord Corporation	$ 125.6	$ 68.9
Earnings Per Share Attributable to Regal Rexnord Corporation:
Basic (in dollars per share)	$ 1.86	$ 1.70
Assuming Dilution (in dollars per share)	$ 1.85	$ 1.68
Inventories	$ 1,336.9		$ 1,192.4
Deferred Income Taxes	661.7		679.7
Retained Earnings	1,927.5		1,912.6
Net Income	127.1	$ 70.3
Change in Operating Assets and Liabilities	(227.7)	(67.4)
Comprehensive income attributable to Regal Rexnord Corporation	$ 145.1	53.7
As Originally Reported | Change In Inventory Valuation
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Sales		568.7
Provision for Income Taxes		20.2
Net income attributable to Regal Rexnord Corporation		$ 65.6
Earnings Per Share Attributable to Regal Rexnord Corporation:
Basic (in dollars per share)		$ 1.62
Assuming Dilution (in dollars per share)		$ 1.60
Inventories			1,106.6
Deferred Income Taxes			652.0
Retained Earnings			1,854.5
Net Income		$ 67.0
Change in Operating Assets and Liabilities		(64.1)
Comprehensive income attributable to Regal Rexnord Corporation		50.4
Effect of Change | Change In Inventory Valuation
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Sales		(4.4)
Provision for Income Taxes		1.1
Net income attributable to Regal Rexnord Corporation		$ 3.3
Earnings Per Share Attributable to Regal Rexnord Corporation:
Basic (in dollars per share)		$ 0.08
Assuming Dilution (in dollars per share)		$ 0.08
Inventories			85.8
Deferred Income Taxes			27.7
Retained Earnings			$ 58.1	$ 38.4
Net Income		$ 3.3
Change in Operating Assets and Liabilities		(3.3)
Comprehensive income attributable to Regal Rexnord Corporation		$ 3.3