CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Statement of Comprehensive Income [Abstract]
Net Income	$ 218.1	$ 209.3	$ 148.5
Translation:
Foreign Currency Translation Adjustments	103.1	(68.2)	(94.5)
Hedging Activities:
Increase (Decrease) in Fair Value of Hedging Activities, Net of Tax Effects of $26.1 Million in 2017, $(15.2) Million in 2016 and $(26.6) Million in 2015	42.4	(24.8)	(43.3)
Reclassification of Gains (Losses) Included in Net Income, Net of Tax Effects of $4.5 Million in 2017, $19.1 Million in 2016, and $16.5 Million in 2015	7.3	31.2	26.8
Hedging Activities	49.7	6.4	(16.5)
Pension and Post Retirement Plans:
Decrease (Increase) in Prior Service Cost and Unrecognized Gain (Loss), Net of Tax Effects of $0.4 Million in 2017, $(1.5) Million in 2016 and $1.8 Million in 2015	1.8	(2.8)	1.2
Amortization of Prior Service Cost and Unrecognized Loss Included in Net Periodic Pension Cost, Net of Tax Effects of $0.9 Million in 2017, $1.2 Million in 2016 and $1.6 Million in 2015	1.6	2.2	2.9
Amortization of Prior Service Cost and Unrecognized Loss Included in Net Periodic Pension Cost, Net of Tax Effects of $0.9 Million in 2017, $1.2 Million in 2016 and $1.6 Million in 2015	3.4	(0.6)	4.1
Other Comprehensive Income (Loss)	156.2	(62.4)	(106.9)
Comprehensive Income	374.3	146.9	41.6
Less: Comprehensive Income Attributable to Noncontrolling Interest	7.2	3.9	2.3
Comprehensive Income Attributable to Regal Beloit Corporation	$ 367.1	$ 143.0	$ 39.3