Business Segments (Schedule Of Reportable Segments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012	Dec. 29, 2012
Segment Reporting Information [Line Items]
External sales	$ 768.2	$ 779.5	$ 2,368.4	$ 2,451.3
Intersegment sales	0	0	0	0
Total sales	768.2	779.5	2,368.4	2,451.3
Segment income from operations	78.8	83.3	235.8	265.7
Identifiable assets	3,709.3	3,423.7	3,709.3	3,423.7	3,569.1
Depreciation and amortization	31.7	34.4	95.1	95.0
Electrical Segment [Member]
Segment Reporting Information [Line Items]
External sales	707.5	708.3	2,171.8	2,223.3
Intersegment sales	1.2	0.9	3.2	2.7
Total sales	708.7	709.2	2,175.0	2,226.0
Segment income from operations	71.1	73.2	211.1	234.1
Identifiable assets	3,483.1	3,216.1	3,483.1	3,216.1
Depreciation and amortization	28.5	32.3	85.6	87.3
Mechanical Segment [Member]
Segment Reporting Information [Line Items]
External sales	60.7	71.2	196.6	228.0
Intersegment sales	1.2	1.3	4.0	2.9
Total sales	61.9	72.5	200.6	230.9
Segment income from operations	7.7	10.1	24.7	31.6
Identifiable assets	226.2	207.6	226.2	207.6
Depreciation and amortization	3.2	2.1	9.5	7.7
Eliminations [Member]
Segment Reporting Information [Line Items]
External sales	0	0	0	0
Intersegment sales	(2.4)	(2.2)	(7.2)	(5.6)
Total sales	(2.4)	(2.2)	(7.2)	(5.6)
Segment income from operations	0	0	0	0
Identifiable assets	0	0	0	0
Depreciation and amortization	$ 0	$ 0	$ 0	$ 0