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Segments and Related Information (Schedule of Financial Information by Reportable Segment - Depreciation and Amortization) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Depreciation and Amortization: |  |  |
Depreciation | $ 297.8 | $ 235.5 | $ 212.9
Reportable Segments [Member] | Communications [Member] |  |  |
Depreciation and Amortization: |  |  |
Depreciation | 87.1 | 65.0 | 59.3
Reportable Segments [Member] | Clean Energy and Infrastructure |  |  |
Depreciation and Amortization: |  |  |
Depreciation | 18.2 | 14.1 | 13.7
Reportable Segments [Member] | Oil and Gas [Member] |  |  |
Depreciation and Amortization: |  |  |
Depreciation | 156.6 | 127.2 | 113.7
Reportable Segments [Member] | Electrical Transmission [Member] |  |  |
Depreciation and Amortization: |  |  |
Depreciation | 24.7 | 20.0 | 19.8
Reportable Segments [Member] | Other [Member] |  |  |
Depreciation and Amortization: |  |  |
Depreciation | 0.1 | 0.1 | 0.1
Corporate [Member] |  |  |
Depreciation and Amortization: |  |  |
Depreciation | $ 11.1 | $ 9.1 | $ 6.3

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