Business Segments (Schedule Of Reportable Segments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended		15 Months Ended
	Sep. 29, 2012	Sep. 29, 2012	Oct. 01, 2011	Oct. 01, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
External sales	$ 779.5	$ 2,451.3	$ 2,081.3	$ 736.9
Intersegment sales	0	0	0	0
Total sales	779.5	2,451.3	2,081.3	736.9
Segment income from operations	83.3	265.7	197.1	78.1
Identifiable assets	3,423.7	3,423.7	3,372.6		3,266.5
Depreciation and amortization	34.4	95.0	69.7	26.1
Electrical Segment [Member]
Segment Reporting Information [Line Items]
External sales	708.3	2,223.3	1,873.1	667.5
Intersegment sales	0.9	2.7	7.2	2.1
Total sales	709.2	2,226.0	1,880.3	669.6
Segment income from operations	73.2	234.1	169.8	69.4
Identifiable assets	3,216.1	3,216.1	3,259.5
Depreciation and amortization	32.3	87.3	65.3	24.7
Mechanical Segment [Member]
Segment Reporting Information [Line Items]
External sales	71.2	228.0	208.2	69.4
Intersegment sales	1.3	2.9	1.9	0.7
Total sales	72.5	230.9	210.1	70.1
Segment income from operations	10.1	31.6	27.3	8.7
Identifiable assets	207.6	207.6	113.1
Depreciation and amortization	2.1	7.7	4.4	1.4
Eliminations [Member]
Segment Reporting Information [Line Items]
External sales	0	0	0	0
Intersegment sales	(2.2)	(5.6)	(9.1)	(2.8)
Total sales	(2.2)	(5.6)	(9.1)	(2.8)
Segment income from operations	0	0	0	0
Identifiable assets	0	0	0
Depreciation and amortization	$ 0	$ 0	$ 0