Goodwill and Other Intangible Assets (Rollforward of Goodwill by Segment) (Details) (USD $)	6 Months Ended
	Jun. 30, 2014
Goodwill [Line Items]
Goodwill, beginning balance	$ 902,044,000
Additions from new business combinations, goodwill	81,500,000
Currency translation adjustments, goodwill	900,000
Other adjustments, goodwill	(1,300,000)
Goodwill, ending balance	983,133,000
Reportable Segments [Member] | Communications [Member]
Goodwill [Line Items]
Goodwill, beginning balance	326,800,000
Additions from new business combinations, goodwill	28,600,000
Currency translation adjustments, goodwill	0
Other adjustments, goodwill	(1,300,000)
Goodwill, ending balance	354,100,000
Reportable Segments [Member] | Oil and Gas [Member]
Goodwill [Line Items]
Goodwill, beginning balance	307,700,000
Additions from new business combinations, goodwill	52,900,000
Currency translation adjustments, goodwill	900,000
Other adjustments, goodwill	0
Goodwill, ending balance	361,500,000
Reportable Segments [Member] | Electrical Transmission [Member]
Goodwill [Line Items]
Goodwill, beginning balance	149,900,000
Additions from new business combinations, goodwill	0
Currency translation adjustments, goodwill	0
Other adjustments, goodwill	0
Goodwill, ending balance	149,900,000
Reportable 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
Other adjustments, goodwill	0
Goodwill, ending balance	$ 117,600,000