CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 52.7	$ 63.6	$ 179.3	$ 165.5
Other Comprehensive Income (Loss) Net of Tax:
Foreign Currency Translation Adjustments, Net of Tax Effects of $1.8 Million for the Three and Nine Months ended September 29, 2018	(18.8)	24.6	(57.0)	93.1
Hedging Activities:
Increase in Fair Value of Hedging Activities, Net of Tax Effects of $0.9 Million and $5.5 Million for the Three Months ended September 29, 2018 and September 30, 2017 and $0.7 Million and $23.5 Million for the Nine Months ended September 29, 2018 and September 30, 2017, Respectively	3.1	8.8	2.3	38.2
Reclassification of (Gains) Losses included in Net Income, Net of Tax Effects of $(0.3) Million and $(0.2) Million for the Three Months ended September 29, 2018 and September 30, 2017 and $(3.7) Million and $6.0 Million for the Nine Months ended September 29, 2018 and September 30, 2017, Respectively	(1.0)	(0.1)	(11.3)	9.9
Pension and Post Retirement Plans:
Reclassification Adjustments for Pension and Post Retirement Benefits included in Net Income, Net of Tax Effects of $0.3 Million and $0.2 Million for the Three Months Ended September 29, 2018 and September 30, 2017 and $0.7 Million and $0.6 Million for the Nine Months Ended September 29, 2018 and September 30, 2017, Respectively	0.7	0.4	2.2	1.2
Other Comprehensive Income (Loss)	(16.0)	33.7	(63.8)	142.4
Comprehensive Income	36.7	97.3	115.5	307.9
Less: Comprehensive Income Attributable to Noncontrolling Interests	0.3	2.0	1.8	5.6
Comprehensive Income Attributable to Regal Beloit Corporation	$ 36.4	$ 95.3	$ 113.7	$ 302.3