Accounting Policies (Condensed Financial Statements) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Sales	$ 3,548.2	$ 2,698.7	$ 2,100.4
Provision for Income Taxes	118.9	74.7	56.3
Net Income Attributable to Regal Beloit Corporation	$ 488.9	$ 229.6	$ 187.7
Earnings Per Share Attributable to Regal Rexnord Corporation:
Basic (in dollars per share)	$ 7.33	$ 4.85	$ 4.62
Assuming Dilution (in dollars per share)	$ 7.29	$ 4.81	$ 4.60
Inventories	$ 1,336.9	$ 1,192.4
Deferred Income Taxes	591.9	679.7
Retained Earnings	2,130.0	1,912.6
Net Income	494.9	235.8	$ 192.2
Inventories	(174.4)	(174.4)	(1.6)
Benefit from Deferred Income Taxes	(80.1)	(8.7)	(17.0)
Comprehensive income attributable to Regal Rexnord Corporation	331.9	197.8	262.2
As Originally Reported | Change In Inventory Valuation
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Sales	3,616.4	2,724.6	2,098.3
Provision for Income Taxes	102.6	68.5	56.8
Net Income Attributable to Regal Beloit Corporation	$ 437.0	$ 209.9	$ 189.3
Earnings Per Share Attributable to Regal Rexnord Corporation:
Basic (in dollars per share)	$ 6.55	$ 4.44	$ 4.66
Assuming Dilution (in dollars per share)	$ 6.51	$ 4.40	$ 4.64
Inventories	$ 1,182.9	$ 1,106.6
Deferred Income Taxes	547.9	652.0
Retained Earnings	2,020.0	1,854.5
Net Income	443.0	216.1	$ 193.8
Inventories	(106.2)	(148.5)	(3.7)
Benefit from Deferred Income Taxes	(96.4)	(14.9)	(16.5)
Comprehensive income attributable to Regal Rexnord Corporation	280.0	178.1	263.8
Effect of Change | Change In Inventory Valuation
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of Sales	(68.2)	(25.9)	2.1
Provision for Income Taxes	16.3	6.2	(0.5)
Net Income Attributable to Regal Beloit Corporation	$ 51.9	$ 19.7	$ (1.6)
Earnings Per Share Attributable to Regal Rexnord Corporation:
Basic (in dollars per share)	$ 0.78	$ 0.41	$ (0.04)
Assuming Dilution (in dollars per share)	$ 0.78	$ 0.41	$ (0.04)
Inventories	$ 154.0	$ 85.8
Deferred Income Taxes	44.0	27.7
Retained Earnings	110.0	58.1	$ 38.4
Net Income	51.9	19.7	(1.6)
Inventories	(68.2)	(25.9)	2.1
Benefit from Deferred Income Taxes	16.3	6.2	(0.5)
Comprehensive income attributable to Regal Rexnord Corporation	$ 51.9	$ 19.7	$ (1.6)