CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 67.3	$ 54.3	$ 126.6	$ 101.9
Other Comprehensive Income (Loss) Net of Tax:
Foreign Currency Translation Adjustments	(68.8)	39.1	(38.2)	68.5
Hedging Activities:
Increase (Decrease) in Fair Value of Hedging Activities, Net of Tax Effects of $(3.9) Million and $6.1 Million for the Three Months ended June 30, 2018 and July 1, 2017 and $(0.2) Million and $18.0 Million for the Six Months ended June 30, 2018 and July 1, 2017, Respectively	(12.3)	10.0	(0.8)	29.4
Reclassification of (Gains) Losses included in Net Income, Net of Tax Effects of $(2.8) Million and $1.8 Million for the Three Months ended June 30, 2018 and July 1, 2017 and $(3.4) Million and $6.2 Million for the Six Months ended June 30, 2018 and July 1, 2017, Respectively	(8.5)	2.7	(10.3)	10.0
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 $0.2 Million for the Three Months Ended June 30, 2018 and July 1, 2017 and $0.4 Million and $0.4 Million for the Six Months Ended June 30, 2018 and July 1, 2017, Respectively	0.7	0.4	1.5	0.8
Other Comprehensive Income (Loss)	(88.9)	52.2	(47.8)	108.7
Comprehensive Income (Loss)	(21.6)	106.5	78.8	210.6
Less: Comprehensive Income (Loss) Attributable to Noncontrolling Interests	(0.4)	1.8	1.5	3.6
Comprehensive Income (Loss) Attributable to Regal Beloit Corporation	$ (21.2)	$ 104.7	$ 77.3	$ 207.0