Condensed Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Statement of Comprehensive Income [Abstract]
Net Income	$ 64.3	$ 48.8	$ 167.1	$ 151.9
Other comprehensive income (loss) net of tax:
Foreign currency translation adjustments	(36.8)	(17.2)	(67.3)	(19.0)
Reclassification of foreign currency translation adjustments included in net income, net of immaterial tax effects for the three and nine months ended October 3, 2015 and September 27, 2014	0.0	(1.0)	0.0	(1.0)
Hedging Activities:
(Decrease) in fair value of hedging activities, net of tax effects of $(14.5) million and $(2.2) million for the three months ended October 3, 2015 and September 27, 2014 and $(21.9) million and $(3.5) million for the nine months ended October 3, 2015 and September 27, 2014, respectively	(23.6)	(3.7)	(35.7)	(5.7)
Reclassification of losses included in net income, net of tax effects of $4.1 million and $0.4 million for the three months ended October 3, 2015 and September 27, 2014, respectively and $10.6 million and $3.6 million for the nine months ended October 3, 2015 and September 27, 2014, respectively	6.9	0.8	17.4	5.9
Defined benefit pension plans:
Increase in prior service cost and unrecognized loss, net of immaterial tax effects for the three and nine months ended October 3, 2015 and September 27, 2014	0.0	0.0	0.0	(0.5)
Reclassification adjustments for pension benefits included in net income, net of tax effects of $0.3 million and $0.3 million for the three months ended October 3, 2015 and September 27, 2014 and $1.8 million and $0.7 million for the nine months ended October 3, 2015 and September 27, 2014, respectively	0.7	0.5	1.2	1.2
Other comprehensive income (loss)	(52.8)	(20.6)	(84.4)	(19.1)
Comprehensive income	11.5	28.2	82.7	132.8
Less: Comprehensive income (loss) attributable to noncontrolling interests	(0.1)	0.6	2.3	2.8
Comprehensive income attributable to Regal Beloit Corporation	$ 11.6	$ 27.6	$ 80.4	$ 130.0