Business Segments (Tables)

6 Months Ended

Jun. 30, 2012

Segment Reporting [Abstract]

Schedule of Reportable Segments

The Company has two reportable segments, Mechanical and Electrical (in millions):

	Electrical		Mechanical		Eliminations			Total
Three months ended June 30, 2012
External sales	$	783.6	$	80.3	$	—		$	863.9
Intersegment sales	1.0		0.8		(1.8		)	—
Total sales	784.6		81.1		(1.8		)	863.9
Segment income from operations	91.5		11.8		—			103.3
Identifiable assets	3,251.4		212.1		—			3,463.5
Depreciation and amortization	29.1		3.1		—			32.2
Three months ended July 2, 2011
External Sales	$	611.3	$	70.5	$	—		$	681.8
Intersegment sales	2.8		0.6		(3.4		)	—
Total sales	614.1		71.1		(3.4		)	681.8
Segment income from operations	44.9		9.9		—			54.8
Identifiable assets	2,510.4		135.9		—			2,646.3
Depreciation and amortization	20.1		1.9		—			22.0
	Electrical		Mechanical		Eliminations			Total
Six months ended June 30, 2012
External sales	$	1,515.0	$	156.8	$	—		$	1,671.8
Intersegment sales	1.8		1.6		(3.4		)	—
Total sales	1,516.8		158.4		(3.4		)	1,671.8
Segment income from operations	160.9		21.5		—			182.4
Identifiable assets	3,251.4		212.1		—			3,463.5
Depreciation and amortization	57.5		5.6		—			63.1
Six months ended July 2, 2011
External Sales	$	1,205.6	$	138.8	$	—		$	1,344.4
Intersegment sales	5.2		1.2		(6.4		)	—
Total sales	1,210.8		140.0		(6.4		)	1,344.4
Segment income from operations	100.4		18.5		—			118.9
Identifiable assets	2,510.4		135.9		—			2,646.3
Depreciation and amortization	40.6		3.0		—			43.6