CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 46.7	$ 86.8
Other Comprehensive Income (Loss) Net of Tax:
Foreign Currency Translation Adjustments	(57.5)	11.2
Reclassification of Foreign Currency Translation Adjustments included in Net Income, Net of $0.0 Million Tax Effects for the Three Months Ended March 28, 2020 and March 30, 2019, Respectively	0.0	2.2
Hedging Activities:
Increase (Decrease) in Fair Value of Hedging Activities, Net of Tax Effects of $(9.4) Million and $4.4 Million for the Three Months Ended March 28, 2020 and March 30, 2019, Respectively	(29.6)	14.1
Reclassification of Losses (Gains) included in Net Income, Net of Tax Effects of $(0.6) Million and $0.1 Million for the Three Months Ended March 28, 2020 and March 30, 2019, Respectively	(2.0)	0.3
Pension and Post Retirement Plans:
Reclassification Adjustments for Pension and Post Retirement Benefits included in Net Income, Net of Tax Effects of $0.0 Million and $0.1 Million for the Three Months Ended March 28, 2020 and March 30, 2019, Respectively	0.1	0.4
Other Comprehensive Income (Loss)	(89.0)	28.2
Comprehensive Income (Loss)	(42.3)	115.0
Less: Comprehensive Income Attributable to Noncontrolling Interests	0.2	1.4
Comprehensive Income (Loss) Attributable to Regal Beloit Corporation	$ (42.5)	$ 113.6