CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jun. 27, 2020	Jul. 03, 2021	Jun. 27, 2020
Statement of Comprehensive Income [Abstract]
Net Income	$ 81.2	$ 29.3	$ 148.2	$ 76.0
Other Comprehensive Income (Loss) Net of Tax:
Foreign Currency Translation Adjustments	10.0	18.0	(11.7)	(39.5)
Hedging Activities:
Increase (Decrease) in Fair Value of Hedging Activities, Net of Tax Effects of $4.2 Million and $3.6 Million for the Three Months Ended July 3, 2021 and June 27, 2020 and $8.8 Million and $(5.8) Million for the Six Months Ended July 3, 2021 and June 27, 2020, Respectively	13.3	11.3	27.9	(18.3)
Reclassification of (Gains) Losses included in Net Income, Net of Tax Effects of $(2.7) Million and $0.5 Million for the Three Months Ended July 3, 2021 and June 27, 2020 and $(5.5) Million and $(0.1) Million for the Six Months Ended July 3, 2021 and June 27, 2020, Respectively	(8.6)	1.6	(17.3)	(0.4)
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 for the Three Months Ended July 3, 2021 and June 27, 2020 and $0.2 Million and $0.1 Million for the Six Months Ended July 3, 2021 and June 27, 2020, Respectively	0.4	0.1	0.7	0.2
Other Comprehensive Income (Loss)	15.1	31.0	(0.4)	(58.0)
Comprehensive Income	96.3	60.3	147.8	18.0
Less: Comprehensive Income (Loss) Attributable to Noncontrolling Interests	2.3	1.1	3.4	1.3
Comprehensive Income Attributable to Regal Beloit Corporation	$ 94.0	$ 59.2	$ 144.4	$ 16.7