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Segments and Related Information (Schedule of Financial Information by Reportable Segment - EBITDA) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
EBITDA: |  |  |  |  |
EBITDA |  |  | $ 782,500,000 | $ 823,400,000 | $ 660,800,000
Intangible asset, pre-tax impairment charge |  |  |  | 3,300,000 | 0
Goodwill, pre-tax impairment charge |  |  |  |  | 47,700,000
Loss on extinguishment of debt | $ (5,600,000) |  | (5,569,000) | 0 | 0
4.875% Senior Notes [Member] | Senior Notes [Member] |  |  |  |  |
EBITDA: |  |  |  |  |
Loss on extinguishment of debt |  |  | 5,600,000 |  |
Joint Venture [Member] |  |  |  |  |
EBITDA: |  |  |  |  |
Project gains (in dollars) |  |  |  |  | (1,000,000.0)
Reportable Segments [Member] | Communications [Member] |  |  |  |  |
EBITDA: |  |  |  |  |
EBITDA |  |  | 270,100,000 | 208,800,000 | 290,400,000
Reportable Segments [Member] | Clean Energy and Infrastructure |  |  |  |  |
EBITDA: |  |  |  |  |
EBITDA |  |  | 80,400,000 | 40,100,000 | 40,400,000
Reportable Segments [Member] | Oil and Gas [Member] |  |  |  |  |
EBITDA: |  |  |  |  |
EBITDA |  |  | 510,900,000 | 634,200,000 | 451,600,000
Reportable Segments [Member] | Electrical Transmission [Member] |  |  |  |  |
EBITDA: |  |  |  |  |
EBITDA |  |  | 14,900,000 | 29,500,000 | 10,500,000
Reportable Segments [Member] | Other [Member] |  |  |  |  |
EBITDA: |  |  |  |  |
EBITDA |  |  | 30,700,000 | 26,500,000 | 24,400,000
Corporate [Member] |  |  |  |  |
EBITDA: |  |  |  |  |
EBITDA |  |  | $ (124,500,000) | (115,700,000) | $ (156,400,000)
Pre-Qualifications [Member] |  |  |  |  |
EBITDA: |  |  |  |  |
Intangible asset, pre-tax impairment charge |  | $ 3,300,000 |  | $ 3,300,000 |

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