Business Segments (Schedule Of Reportable Segments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012	Dec. 29, 2012
Segment Reporting Information [Line Items]
External sales	$ 822.0	$ 863.9	$ 1,600.2	$ 1,671.8
Intersegment sales	0	0	0	0
Total sales	822.0	863.9	1,600.2	1,671.8
Segment income from operations	81.1	103.3	157.0	182.4
Identifiable assets	3,668.1	3,463.5	3,668.1	3,463.5	3,569.1
Depreciation and amortization	31.8	32.2	63.4	63.1
Electrical Segment [Member]
Segment Reporting Information [Line Items]
External sales	753.3	783.6	1,464.3	1,515.0
Intersegment sales	1.1	1.0	2.0	1.8
Total sales	754.4	784.6	1,466.3	1,516.8
Segment income from operations	72.7	91.5	140.0	160.9
Identifiable assets	3,441.3	3,251.4	3,441.3	3,251.4
Depreciation and amortization	28.7	29.1	57.1	57.5
Mechanical Segment [Member]
Segment Reporting Information [Line Items]
External sales	68.7	80.3	135.9	156.8
Intersegment sales	1.7	0.8	2.8	1.6
Total sales	70.4	81.1	138.7	158.4
Segment income from operations	8.4	11.8	17.0	21.5
Identifiable assets	226.8	212.1	226.8	212.1
Depreciation and amortization	3.1	3.1	6.3	5.6
Eliminations [Member]
Segment Reporting Information [Line Items]
External sales	0	0	0	0
Intersegment sales	(2.8)	(1.8)	(4.8)	(3.4)
Total sales	(2.8)	(1.8)	(4.8)	(3.4)
Segment income from operations	0	0	0	0
Identifiable assets	0	0	0	0
Depreciation and amortization	$ 0	$ 0	$ 0	$ 0