CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 59.3	$ 47.6
Other Comprehensive Income (Loss) Net of Tax:
Foreign Currency Translation Adjustments	30.6	29.4
Hedging Activities:
Increase in Fair Value of Hedging Activities, Net of Tax Effects of $3.7 Million and $11.9 Million for the Three Months ended March 31, 2018 and April 1, 2017, Respectively	11.5	19.4
Reclassification of (Gains) Losses included in Net Income, Net of Tax Effects of $(0.6) Million and $4.4 Million for the Three Months ended March 31, 2018 and April 1, 2017, Respectively	(1.8)	7.3
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 March 31, 2018 and April 1, 2017, Respectively	0.8	0.4
Other Comprehensive Income	41.1	56.5
Comprehensive Income	100.4	104.1
Less: Comprehensive Income Attributable to Noncontrolling Interest	1.9	1.8
Comprehensive Income Attributable to Regal Beloit Corporation	$ 98.5	$ 102.3