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Segments and Related Information (Schedule of Financial Information by Reportable Segment - EBITDA - Continuing Operations) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
EBITDA - Continuing Operations: |  |  |  |
EBITDA - Continuing operations | $ 67.8 | $ 134.2 | $ 164.4 | $ 303.6
Reportable Segments [Member] | Communications [Member] |  |  |  |
EBITDA - Continuing Operations: |  |  |  |
EBITDA - Continuing operations | 49.7 | 52.5 | 141.8 | 153.7
Reportable Segments [Member] | Oil and Gas [Member] |  |  |  |
EBITDA - Continuing Operations: |  |  |  |
EBITDA - Continuing operations | 51.0 | 73.4 | 113.9 | 144.2
Reportable Segments [Member] | Electrical Transmission [Member] |  |  |  |
EBITDA - Continuing Operations: |  |  |  |
EBITDA - Continuing operations | (23.7) | 18.5 | (47.6) | 35.1
Reportable Segments [Member] | Power Generation and Industrial [Member] |  |  |  |
EBITDA - Continuing Operations: |  |  |  |
EBITDA - Continuing operations | 4.8 | 4.9 | 3.9 | 9.4
Reportable Segments [Member] | Other [Member] |  |  |  |
EBITDA - Continuing Operations: |  |  |  |
EBITDA - Continuing operations | (2.0) | (0.7) | (7.1) | (0.1)
Corporate [Member] |  |  |  |
EBITDA - Continuing Operations: |  |  |  |
EBITDA - Continuing operations | $ (12.0) | $ (14.4) | $ (40.5) | $ (38.7)

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