CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Statement of Comprehensive Income [Abstract]
Net Income	$ 63.6	$ 61.1	$ 165.5	$ 162.2
Other Comprehensive Income (Loss) Net of Tax:
Foreign Currency Translation Adjustments	24.6	(2.4)	93.1	(9.2)
Hedging Activities:
Increase (Decrease) in Fair Value of Hedging Activities, Net of Tax Effects of $5.5 Million and $(3.8) Million for the Three Months ended September 30, 2017 and October 1, 2016 and $23.5 Million and $(9.2) Million for the Nine Months ended September 30, 2017 and October 1, 2016 Respectively	8.8	(6.3)	38.2	(15.1)
Reclassification of Losses included in Net Income, Net of Tax Effects of $(0.2) Million and $4.6 Million for the Three Months ended September 30, 2017 and October 1, 2016 and $6.0 Million and $14.3 Million for the Nine Months ended September 30, 2017 and October 1, 2016 Respectively	(0.1)	7.7	9.9	23.4
Pension and Post Retirement Plans:
Reclassification Adjustments for Pension and Post Retirement Benefits included in Net Income, Net of Tax Effects of $0.2 Million and $0.3 Million for the Three Months Ended September 30, 2017 and October 1, 2016 and $0.6 Million and $0.9 Million for the Nine Months Ended September 30, 2017 and October 1, 2016, Respectively	0.4	0.5	1.2	1.8
Other Comprehensive Income (Loss)	33.7	(0.5)	142.4	0.9
Comprehensive Income	97.3	60.6	307.9	163.1
Less: Comprehensive Income Attributable to Noncontrolling Interests	2.0	1.6	5.6	4.0
Comprehensive Income Attributable to Regal Beloit Corporation	$ 95.3	$ 59.0	$ 302.3	$ 159.1