Industry Segment Information (Schedule Of Financial Information Attributable To The Reporting Segments) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Revenue from External Customers	$ 3,166.9	$ 2,808.3	$ 2,238.0
Net Sales	3,166.9	2,808.3	2,238.0
Income From Operations	312.8	255.7	237.8
Capital Expenditures	91.0	57.6	45.0
Intersegment sales	0	0	0
Assets	3,569.1	3,266.5	2,449.1
Depreciation, Depletion and Amortization	126.0	98.2	72.9
Electrical Segment [Member]
Segment Reporting Information [Line Items]
Revenue from External Customers	2,870.2	2,533.3	2,002.0
Net Sales	2,873.7	2,542.1	2,014.5
Income From Operations	273.7	222.6	210.2
Capital Expenditures	(82.2)	(53.8)	(41.1)
Intersegment sales	3.5	8.8	12.5
Assets	3,323.6	3,139.3	2,323.1
Depreciation, Depletion and Amortization		92.0	66.8
Mechanical Segment [Member]
Segment Reporting Information [Line Items]
Revenue from External Customers	296.7	275.0	236.0
Net Sales	300.6	277.5	238.0
Income From Operations	39.1	33.1	27.6
Capital Expenditures	(8.8)	(3.8)	(3.9)
Intersegment sales	3.9	2.5	2.0
Assets	245.5	127.2	126.0
Depreciation, Depletion and Amortization		6.2	6.1
Business Intersegment, Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from External Customers	0	0	0
Net Sales	(7.4)	(11.3)	(14.5)
Income From Operations	0	0	0
Capital Expenditures	0	0	0
Intersegment sales	(7.4)	(11.3)	(14.5)
Assets	0	0	0
Depreciation, Depletion and Amortization		0	0
United States [Member]
Segment Reporting Information [Line Items]
Net Sales	2,127.2	1,798.2	1,530.9
Rest Of The World [Member]
Segment Reporting Information [Line Items]
Net Sales	$ 1,039.7	$ 1,010.1	$ 707.1