CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 242.6	$ 235.8	$ 218.1
Translation:
Foreign Currency Translation Adjustments	(9.2)	(71.2)	103.1
Reclassification of Foreign Currency Translation Adjustments Included in Net Income, Net of $0.0 Million Tax Effects in 2019, 2018 and 2017.	1.6	0.0	0.0
Hedging Activities:
Increase (Decrease) in Fair Value of Hedging Activities, Net of Tax Effects of $4.6 Million in 2019, $(1.2) Million in 2018 and $26.1 Million in 2017	14.7
Increase (Decrease) in Fair Value of Hedging Activities, Net of Tax Effects of $4.6 Million in 2019, $(1.2) Million in 2018 and $26.1 Million in 2017		(4.0)	42.4
Reclassification of (Gains) Losses Included in Net Income, Net of Tax Effects of $(0.4) Million in 2019, $(3.8) Million in 2018 and $4.5 Million in 2017	(1.3)
Reclassification of (Gains) Losses Included in Net Income, Net of Tax Effects of $(0.4) Million in 2019, $(3.8) Million in 2018 and $4.5 Million in 2017		(12.0)	7.3
Hedging Activities	13.4
Hedging Activities		(16.0)	49.7
Pension and Post Retirement Plans:
Decrease (Increase) in Prior Service Cost and Unrecognized Gain (Loss), Net of Tax Effects of $1.8 Million in 2019, $(0.6) Million in 2018 and $0.4 Million in 2017	5.7	(1.9)	1.8
Amortization of Prior Service Cost and Unrecognized Loss Included in Net Periodic Pension Cost, Net of Tax Effects of $0.5 Million in 2019, $0.8 Million in 2018 and $0.9 Million in 2017	1.5	2.9	1.6
Amortization of Prior Service Cost and Unrecognized Loss Included in Net Periodic Pension Cost, Net of Tax Effects of $0.5 Million in 2019, $0.8 Million in 2018 and $0.9 Million in 2017	7.2	1.0	3.4
Other Comprehensive Income (Loss)	13.0	(86.2)	156.2
Comprehensive Income	255.6	149.6	374.3
Less: Comprehensive Income Attributable to Noncontrolling Interest	3.1	2.8	7.2
Comprehensive Income Attributable to Regal Beloit Corporation	$ 252.5	$ 146.8	$ 367.1