CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net Income	$ 67.4	$ 67.3	$ 154.2	$ 126.6
Other Comprehensive Income (Loss) Net of Tax:
Foreign Currency Translation Adjustments	(4.4)	(68.8)	6.8	(38.2)
Reclassification of Foreign Currency Translation Adjustments included in Net Income, Net of $0.0 Million Tax Effects for the Three and Six Months Ended June 29, 2019 and June 30, 2018, Respectively	(0.6)	0.0	1.6	0.0
Hedging Activities:
Increase (Decrease) in Fair Value of Hedging Activities, Net of Tax Effects of $(1.4) Million and $(3.9) Million for the Three Months Ended June 29, 2019 and June 30, 2018 and $3.0 Million and $(0.2) Million for the Six Months Ended June 29, 2019 and June 30, 2018, Respectively	(4.8)	(12.3)	9.3	(0.8)
Reclassification of Losses included in Net Income, Net of Tax Effects of $(0.1) Million and $(2.8) Million for the Three Months Ended June 29, 2019 and June 30, 2018 and $0.0 Million and $(3.4) Million for the Six Months Ended June 29, 2019 and June 30, 2018, Respectively	(0.3)	(8.5)	0.0	(10.3)
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 June 29, 2019 and June 30, 2018 and $0.2 Million and $0.4 Million for the Six Months Ended June 29, 2019 and June 30, 2018, Respectively	0.5	0.7	0.9	1.5
Other Comprehensive Income (Loss)	(9.6)	(88.9)	18.6	(47.8)
Comprehensive Income (Loss)	57.8	(21.6)	172.8	78.8
Less: Comprehensive Income (Loss) Attributable to Noncontrolling Interests	0.3	(0.4)	1.7	1.5
Comprehensive Income (Loss) Attributable to Regal Beloit Corporation	$ 57.5	$ (21.2)	$ 171.1	$ 77.3