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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.

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of other (increase) decrease of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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