Goodwill and Other Intangible Assets (Rollforward of Goodwill by Segment) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014
Goodwill [Line Items]
Goodwill, beginning balance	$ 900,454,000
Additions from new business combinations, goodwill	14,500,000
Currency translation adjustments, goodwill	(2,100,000)
Goodwill, ending balance	912,885,000
Operating Segments [Member] | Communications [Member]
Goodwill [Line Items]
Goodwill, beginning balance	327,900,000
Additions from new business combinations, goodwill	14,500,000
Currency translation adjustments, goodwill	0
Goodwill, ending balance	342,400,000
Operating Segments [Member] | Oil and Gas [Member]
Goodwill [Line Items]
Goodwill, beginning balance	305,200,000
Additions from new business combinations, goodwill	0
Currency translation adjustments, goodwill	(2,100,000)
Goodwill, ending balance	303,100,000
Operating Segments [Member] | Electrical Transmission [Member]
Goodwill [Line Items]
Goodwill, beginning balance	149,800,000
Additions from new business combinations, goodwill	0
Currency translation adjustments, goodwill	0
Goodwill, ending balance	149,800,000
Operating Segments [Member] | Power Generation and Industrial [Member]
Goodwill [Line Items]
Goodwill, beginning balance	117,600,000
Additions from new business combinations, goodwill	0
Currency translation adjustments, goodwill	0
Goodwill, ending balance	$ 117,600,000