Condensed Consolidated Statements Of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
Statement of Comprehensive Income [Abstract]
Net Income	$ 64.9	$ 58.1	$ 102.8	$ 103.1
Other comprehensive income (loss) net of tax:
Foreign currency translation adjustments	(7.8)	3.0	(30.5)	(1.8)
Hedging Activities:
Increase (Decrease) in fair value of hedging activities, net of tax effects of $(5.0) million and $4.0 million for the three months ended July 4, 2015 and June 28, 2014 and $(7.4) million and $(1.3) million for the six months ended July 4, 2015 and June 28, 2014, respectively	(8.2)	6.5	(12.1)	(2.0)
Reclassification of losses included in net income, net of tax effects of $4.2 million and $1.7 million for the three months ended July 4, 2015 and June 28, 2014, respectively and $6.5 million and $3.2 million for the six months ended July 4, 2015 and June 28, 2014, respectively	6.8	2.7	10.5	5.1
Defined benefit pension plans:
Increase in prior service cost and unrecognized loss, net of immaterial tax effects for the three and six months ended July 4, 2015 and June 28, 2014 respectively	0.0	(0.5)	0.0	(0.5)
Reclassification adjustments for pension benefits included in net income, net of tax effects of $1.1 million and $0.2 million for the three months ended July 4, 2015 and June 28, 2014 and $1.5 million and $0.4 million for the six months ended July 4, 2015 and June 28, 2014, respectively	(0.3)	0.4	0.5	0.7
Other comprehensive income (loss)	(9.5)	12.1	(31.6)	1.5
Comprehensive income	55.4	70.2	71.2	104.6
Less: Comprehensive income attributable to noncontrolling interests	1.9	1.6	2.4	2.2
Comprehensive income attributable to Regal Beloit Corporation	$ 53.5	$ 68.6	$ 68.8	$ 102.4