CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 29.3	$ 67.4	$ 76.0	$ 154.2
Other Comprehensive Income (Loss) Net of Tax:
Foreign Currency Translation Adjustments	18.0	(4.4)	(39.5)	6.8
Reclassification of Foreign Currency Translation Adjustments included in Net Income, Net of $0.0 Million Tax Effects for the Three Months and Six Months Ended June 27, 2020 and June 29, 2019, Respectively	0.0	(0.6)	0.0	1.6
Hedging Activities:
Increase (Decrease) in Fair Value of Hedging Activities, Net of Tax Effects of $3.6 Million and $(1.4) Million for the Three Months Ended June 27, 2020 and June 29, 2019 and $(5.8) Million and $3.0 Million for the Six Months Ended June 27, 2020 and June 29, 2019, Respectively	11.3	(4.8)	(18.3)	9.3
Reclassification of Losses (Gains) included in Net Income, Net of Tax Effects of $0.5 Million and $(0.1) Million for the Three Months Ended June 27, 2020 and June 29, 2019 and $(0.1) Million and $0.0 Million for the Six Months Ended June 27, 2020 and June 29, 2019, Respectively	1.6	(0.3)	(0.4)	0.0
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 for the Three Months Ended June 27, 2020 and June 29, 2019 and $0.1 Million and $0.2 Million for the Six Months Ended June 27, 2020 and June 29, 2019, Respectively	0.1	0.5	0.2	0.9
Other Comprehensive Income (Loss)	31.0	(9.6)	(58.0)	18.6
Comprehensive Income	60.3	57.8	18.0	172.8
Less: Comprehensive Income Attributable to Noncontrolling Interests	1.1	0.3	1.3	1.7
Comprehensive Income Attributable to Regal Beloit Corporation	$ 59.2	$ 57.5	$ 16.7	$ 171.1