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Segments and Related Information - Schedule of Financial Information by Reportable Segment- EBITDA and Depreciation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segments and Related Information [Line Items] |  |  |  |
EBITDA | $ 271.8 | $ 253.6 | $ 694.3 | $ 527.4
Depreciation and amortization | 118.7 | 82.6 | 316.7 | 210.6
Reportable Segments | Communications |  |  |  |
Segments and Related Information [Line Items] |  |  |  |
EBITDA | 71.6 | 79.6 | 193.1 | 206.8
Depreciation and amortization | 26.4 | 21.1 | 72.0 | 62.1
Reportable Segments | Clean Energy and Infrastructure |  |  |  |
Segments and Related Information [Line Items] |  |  |  |
EBITDA | 13.8 | 34.4 | 40.2 | 69.5
Depreciation and amortization | 13.0 | 5.0 | 31.1 | 13.7
Reportable Segments | Oil and Gas |  |  |  |
Segments and Related Information [Line Items] |  |  |  |
EBITDA | 170.6 | 160.4 | 476.2 | 315.0
Depreciation and amortization | 55.5 | 47.5 | 163.8 | 107.7
Reportable Segments | Electrical Transmission |  |  |  |
Segments and Related Information [Line Items] |  |  |  |
EBITDA | 34.9 | 9.1 | 47.8 | 14.2
Depreciation and amortization | 21.1 | 6.2 | 41.3 | 18.6
Reportable Segments | Other |  |  |  |
Segments and Related Information [Line Items] |  |  |  |
EBITDA | 7.5 | 7.6 | 23.3 | 22.5
Depreciation and amortization | 0.0 | 0.0 | 0.0 | 0.0
Corporate |  |  |  |
Segments and Related Information [Line Items] |  |  |  |
EBITDA | (26.6) | (37.5) | (86.3) | (100.6)
Depreciation and amortization | $ 2.7 | $ 2.8 | $ 8.5 | $ 8.5

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