OTHER FINANCIAL INFORMATION (Condensed Financial Statements) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jul. 03, 2021	Jun. 30, 2022	Jul. 03, 2021	Jan. 01, 2022	Jan. 02, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Sales	$ 915.9	$ 629.2	$ 1,792.5	$ 1,193.5
Provision for Income Taxes	40.6	20.6	76.8	41.9
Net income attributable to Regal Rexnord Corporation	$ 142.0	$ 84.4	$ 267.6	$ 153.3
Earnings Per Share Attributable to Regal Rexnord Corporation:
Basic (in dollars per share)	$ 2.13	$ 2.07	$ 3.99	$ 3.78
Assuming Dilution (in dollars per share)	$ 2.12	$ 2.06	$ 3.96	$ 3.74
Inventories	$ 1,388.4		$ 1,388.4		$ 1,192.4
Deferred Income Taxes	620.1		620.1		679.7
Retained Earnings	1,996.6		1,996.6		1,912.6
Net Income	143.2	$ 86.0	270.3	$ 156.3
Change in Operating Assets and Liabilities			(353.2)	(113.6)
Comprehensive income attributable to Regal Rexnord Corporation	$ (14.6)	98.8	$ 130.5	152.5
As Originally Reported | Change In Inventory Valuation
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Sales		635.4		1,204.1
Provision for Income Taxes		19.2		39.4
Net income attributable to Regal Rexnord Corporation		$ 79.6		$ 145.2
Earnings Per Share Attributable to Regal Rexnord Corporation:
Basic (in dollars per share)		$ 1.96		$ 3.57
Assuming Dilution (in dollars per share)		$ 1.94		$ 3.54
Inventories					1,106.6
Deferred Income Taxes					652.0
Retained Earnings					1,854.5
Net Income				$ 148.2
Change in Operating Assets and Liabilities				(105.5)
Comprehensive income attributable to Regal Rexnord Corporation		$ 94.0		144.4
Effect of Change | Change In Inventory Valuation
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Sales		(6.2)		(10.6)
Provision for Income Taxes		1.4		2.5
Net income attributable to Regal Rexnord Corporation		$ 4.8		$ 8.1
Earnings Per Share Attributable to Regal Rexnord Corporation:
Basic (in dollars per share)		$ 0.12		$ 0.21
Assuming Dilution (in dollars per share)		$ 0.12		$ 0.20
Inventories					85.8
Deferred Income Taxes					27.7
Retained Earnings					$ 58.1	$ 38.4
Net Income				$ 8.1
Change in Operating Assets and Liabilities				(8.1)
Comprehensive income attributable to Regal Rexnord Corporation		$ 4.8		$ 8.1