Goodwill and Other Intangible Assets (Rollforward of Goodwill by Segment) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014
Goodwill [Line Items]
Goodwill, beginning balance	$ 902,044,000
Additions from new business combinations, goodwill	98,100,000
Currency translation adjustments, goodwill	(4,700,000)
Goodwill, ending balance	1,000,024,000
Earn-Out Arrangements [Member]
Goodwill [Line Items]
Accruals of acquisition-related contingent consideration, net	4,600,000	[1]
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
Goodwill, ending balance	360,000,000
Reportable Segments [Member] | Oil and Gas [Member]
Goodwill [Line Items]
Goodwill, beginning balance	307,700,000
Additions from new business combinations, goodwill	69,500,000
Currency translation adjustments, goodwill	(4,700,000)
Goodwill, ending balance	372,500,000
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
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
Goodwill, ending balance	117,600,000
Reportable Segments [Member] | Earn-Out Arrangements [Member] | Communications [Member]
Goodwill [Line Items]
Accruals of acquisition-related contingent consideration, net	4,600,000	[1]
Reportable Segments [Member] | Earn-Out Arrangements [Member] | Oil and Gas [Member]
Goodwill [Line Items]
Accruals of acquisition-related contingent consideration, net	0	[1]
Reportable Segments [Member] | Earn-Out Arrangements [Member] | Electrical Transmission [Member]
Goodwill [Line Items]
Accruals of acquisition-related contingent consideration, net	0	[1]
Reportable Segments [Member] | Earn-Out Arrangements [Member] | Power Generation and Industrial [Member]
Goodwill [Line Items]
Accruals of acquisition-related contingent consideration, net	$ 0	[1]

[1] Represents contingent consideration for acquisitions prior to January 1, 2009, which is accrued as earned, in accordance with U.S. GAAP.