CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net Income	$ 86.8	$ 59.3
Other Comprehensive Income (Loss) Net of Tax:
Foreign Currency Translation Adjustments	11.2	30.6
Reclassification of Foreign Currency Translation Adjustments included in Net Income, Net of $0 Million and $0 Million Tax Effects for the Three Months Ended March 30, 2019 and March 31, 2018, Respectively	2.2	0.0
Hedging Activities:
Increase in Fair Value of Hedging Activities, Net of Tax Effects of $4.4 Million and $3.7 Million for the Three Months Ended March 30, 2019 and March 31, 2018, Respectively	14.1	11.5
Reclassification of Losses (Gains) included in Net Income, Net of Tax Effects of $(0.1) Million and $(0.6) Million for the Three Months Ended March 30, 2019 and March 31, 2018, Respectively	0.3	(1.8)
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 $0.2 Million for the Three Months Ended March 30, 2019 and March 31, 2018, Respectively	0.4	0.8
Other Comprehensive Income	28.2	41.1
Comprehensive Income	115.0	100.4
Less: Comprehensive Income Attributable to Noncontrolling Interests	1.4	1.9
Comprehensive Income Attributable to Regal Beloit Corporation	$ 113.6	$ 98.5