HELD FOR SALE, ACQUISITIONS AND DIVESTITURES (Pro Forma Information) (Details) - Altra Merger Agreement - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Business Acquisition [Line Items]
Net Sales	$ 1,649.8	$ 1,791.6	$ 5,093.6	$ 5,449.3
Net (Loss) Income Attributable to Regal Rexnord Corporation	$ (126.7)	$ 66.8	$ (7.2)	$ 80.5
Basic (in dollars per share)	$ (1.91)	$ 1.01	$ (0.11)	$ 1.21
Diluted (in dollars per share)	$ (1.91)	$ 1.00	$ (0.11)	$ 1.20

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
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+ References

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
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-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

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