OTHER FINANCIAL INFORMATION (Condensed Financial Statements) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Oct. 02, 2021	Sep. 30, 2022	Oct. 02, 2021	Jan. 01, 2022	Jan. 02, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Sales	$ 917.6	$ 624.6	$ 2,710.1	$ 1,818.1
Provision for Income Taxes	33.2	21.0	110.0	62.9
Net income attributable to Regal Rexnord Corporation	$ 119.8	$ 79.8	$ 387.4	$ 233.1
Earnings Per Share Attributable to Regal Rexnord Corporation:
Basic (in dollars per share)	$ 1.81	$ 1.96	$ 5.80	$ 5.73
Assuming Dilution (in dollars per share)	$ 1.80	$ 1.95	$ 5.76	$ 5.69
Inventories	$ 1,361.5		$ 1,361.5		$ 1,192.4
Deferred Income Taxes	586.5		586.5		679.7
Retained Earnings	2,051.7		2,051.7		1,912.6
Net Income	121.9	$ 81.4	392.2	$ 237.7
Change in Operating Assets and Liabilities			(428.5)	(131.4)
Comprehensive income attributable to Regal Rexnord Corporation	$ (64.6)	50.2	$ 65.9	202.7
As Originally Reported | Change In Inventory Valuation
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Sales		638.1		1,842.2
Provision for Income Taxes		17.8		57.2
Net income attributable to Regal Rexnord Corporation		$ 69.5		$ 214.7
Earnings Per Share Attributable to Regal Rexnord Corporation:
Basic (in dollars per share)		$ 1.71		$ 5.28
Assuming Dilution (in dollars per share)		$ 1.70		$ 5.24
Inventories					1,106.6
Deferred Income Taxes					652.0
Retained Earnings					1,854.5
Net Income				$ 219.3
Change in Operating Assets and Liabilities				(113.0)
Comprehensive income attributable to Regal Rexnord Corporation		$ 39.9		184.3
Effect of Change | Change In Inventory Valuation
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Sales		(13.5)		(24.1)
Provision for Income Taxes		3.2		5.7
Net income attributable to Regal Rexnord Corporation		$ 10.3		$ 18.4
Earnings Per Share Attributable to Regal Rexnord Corporation:
Basic (in dollars per share)		$ 0.25		$ 0.45
Assuming Dilution (in dollars per share)		$ 0.25		$ 0.45
Inventories					85.8
Deferred Income Taxes					27.7
Retained Earnings					$ 58.1	$ 38.4
Net Income				$ 18.4
Change in Operating Assets and Liabilities				(18.4)
Comprehensive income attributable to Regal Rexnord Corporation		$ 10.3		$ 18.4