Business Segments (Schedule Of Reportable Segments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Dec. 29, 2012
Segment Reporting Information [Line Items]
External sales	$ 778.2	$ 807.9
Intersegment sales	0	0
Total sales	778.2	807.9
Segment income from operations	75.9	79.1
Identifiable assets	3,678.4	3,467.5	3,569.1
Depreciation and amortization	31.6	30.9
Electrical Segment [Member]
Segment Reporting Information [Line Items]
External sales	711.0	731.4
Intersegment sales	0.9	0.8
Total sales	711.9	732.2
Segment income from operations	67.3	69.4
Identifiable assets	3,441.3	3,238.4
Depreciation and amortization	28.4	28.3
Mechanical Segment [Member]
Segment Reporting Information [Line Items]
External sales	67.2	76.5
Intersegment sales	1.2	0.8
Total sales	68.4	77.3
Segment income from operations	8.6	9.7
Identifiable assets	237.1	229.1
Depreciation and amortization	3.2	2.6
Eliminations [Member]
Segment Reporting Information [Line Items]
External sales	0	0
Intersegment sales	(2.1)	(1.6)
Total sales	(2.1)	(1.6)
Segment income from operations	0	0
Identifiable assets	0	0
Depreciation and amortization	$ 0