Business Segments (Schedule Of Reportable Segments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013	Dec. 28, 2013
Segment Reporting Information [Line Items]
External sales	$ 801.2	$ 778.2
Revenue from Related Parties	0	0
Total sales	801.2	778.2
Gross Profit	194.4	199.5
Operating Expenses	124.7	123.6
Segment income from operations	69.7	75.9
Identifiable assets	3,726.5	3,678.4	3,643.5
Depreciation and amortization	32.8	31.6
Payments to Acquire Property, Plant, and Equipment	22.3	20.6
Electrical Segment [Member]
Segment Reporting Information [Line Items]
External sales	736.8	711.0
Revenue from Related Parties	0.9	0.9
Total sales	737.7	711.9
Gross Profit	178.3	181.3
Operating Expenses	115.5	114.0
Segment income from operations	62.8	67.3
Identifiable assets	3,518.9	3,441.3
Depreciation and amortization	29.8	28.4
Payments to Acquire Property, Plant, and Equipment	19.5	18.5
Mechanical Segment [Member]
Segment Reporting Information [Line Items]
External sales	64.4	67.2
Revenue from Related Parties	1.0	1.2
Total sales	65.4	68.4
Gross Profit	16.1	18.2
Operating Expenses	9.2	9.6
Segment income from operations	6.9	8.6
Identifiable assets	207.6	237.1
Depreciation and amortization	3.0	3.2
Payments to Acquire Property, Plant, and Equipment	2.8	2.1
Eliminations [Member]
Segment Reporting Information [Line Items]
External sales	0	0
Revenue from Related Parties	(1.9)	(2.1)
Total sales	(1.9)	(2.1)
Gross Profit	0	0
Operating Expenses	0	0
Segment income from operations	0	0
Identifiable assets	0	0
Depreciation and amortization	0	0
Payments to Acquire Property, Plant, and Equipment	$ 0	$ 0