Goodwill and Other Intangible Assets (Goodwill by Segment Rollforward) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Goodwill [Line Items]
Goodwill, beginning balance	$ 826,629,000		$ 714,800,000
Additions from new business combinations, goodwill	62,600,000		86,500,000
Currency translation adjustments, goodwill	(3,400,000)		(200,000)
Goodwill, ending balance	899,364,000		826,629,000
Earn-out Arrangements [Member]
Goodwill [Line Items]
Accruals of acquisition-related contingent consideration	13,600,000	[1]	25,500,000	[1]
Operating Segments [Member] | Communications [Member]
Goodwill [Line Items]
Goodwill, beginning balance	306,100,000		258,000,000
Additions from new business combinations, goodwill	8,000,000		40,400,000
Currency translation adjustments, goodwill	0		0
Goodwill, ending balance	327,700,000		306,100,000
Operating Segments [Member] | Communications [Member] | Earn-out Arrangements [Member]
Goodwill [Line Items]
Accruals of acquisition-related contingent consideration	13,600,000	[1]	7,700,000	[1]
Operating Segments [Member] | Oil and Gas [Member]
Goodwill [Line Items]
Goodwill, beginning balance	273,400,000		209,700,000
Additions from new business combinations, goodwill	35,200,000		46,100,000
Currency translation adjustments, goodwill	(3,400,000)		(200,000)
Goodwill, ending balance	305,200,000		273,400,000
Operating Segments [Member] | Oil and Gas [Member] | Earn-out Arrangements [Member]
Goodwill [Line Items]
Accruals of acquisition-related contingent consideration	0	[1]	17,800,000	[1]
Operating Segments [Member] | Electrical Transmission [Member]
Goodwill [Line Items]
Goodwill, beginning balance	129,500,000		129,500,000
Additions from new business combinations, goodwill	19,400,000		0
Currency translation adjustments, goodwill	0		0
Goodwill, ending balance	148,900,000		129,500,000
Operating Segments [Member] | Electrical Transmission [Member] | Earn-out Arrangements [Member]
Goodwill [Line Items]
Accruals of acquisition-related contingent consideration	0	[1]	0	[1]
Operating Segments [Member] | Power Generation and Industrial [Member]
Goodwill [Line Items]
Goodwill, beginning balance	117,600,000		117,600,000
Additions from new business combinations, goodwill	0		0
Currency translation adjustments, goodwill	0		0
Goodwill, ending balance	117,600,000		117,600,000
Operating Segments [Member] | Power Generation and Industrial [Member] | Earn-out Arrangements [Member]
Goodwill [Line Items]
Accruals of acquisition-related contingent consideration	$ 0	[1]	$ 0	[1]

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