CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2021	Mar. 28, 2020
Statement of Comprehensive Income [Abstract]
Net Income	$ 67.0	$ 46.7
Other Comprehensive Income (Loss) Net of Tax:
Foreign Currency Translation Adjustments	(21.7)	(57.5)
Hedging Activities:
Increase (Decrease) in Fair Value of Hedging Activities, Net of Tax Effects of $4.6 Million and $(9.4) Million for the Three Months Ended April 3, 2021 and March 28, 2020, Respectively	14.6	(29.6)
Reclassification of Gains included in Net Income, Net of Tax Effects of $(2.8) Million and $(0.6) Million for the Three Months Ended April 3, 2021 and March 28, 2020, Respectively	(8.7)	(2.0)
Pension and Post Retirement Plans:
Reclassification Adjustments for Pension and Post Retirement Benefits included in Net Income, Net of Tax Effects of $0.1 Million and zero for the Three Months Ended April 3, 2021 and March 28, 2020, Respectively	0.3	0.1
Other Comprehensive Loss	(15.5)	(89.0)
Comprehensive Income (Loss)	51.5	(42.3)
Less: Comprehensive Income Attributable to Noncontrolling Interests	1.1	0.2
Comprehensive Income (Loss) Attributable to Regal Beloit Corporation	$ 50.4	$ (42.5)