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v3.21.1

Leases - Schedule of Estimated Useful Life of Right of Use Assets (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Sites | Bottom of range [member] |  |
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] |  |
Estimated useful life of right-of-use assets | 1 year | 1 year
Sites | Top of range [member] |  |
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] |  |
Estimated useful life of right-of-use assets | 30 years | 30 years
International Leased Circuits | Bottom of range [member] |  |
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] |  |
Estimated useful life of right-of-use assets | 3 years | 3 years
International Leased Circuits | Top of range [member] |  |
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] |  |
Estimated useful life of right-of-use assets | 7 years | 7 years
Poles | Bottom of range [member] |  |
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] |  |
Estimated useful life of right-of-use assets | 1 year | 1 year
Poles | Top of range [member] |  |
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] |  |
Estimated useful life of right-of-use assets | 10 years | 10 years
Domestic Leased Circuits | Bottom of range [member] |  |
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] |  |
Estimated useful life of right-of-use assets | 4 years | 4 years
Domestic Leased Circuits | Top of range [member] |  |
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] |  |
Estimated useful life of right-of-use assets | 10 years | 10 years
Office buildings [Member] | Bottom of range [member] |  |
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] |  |
Estimated useful life of right-of-use assets | 1 year | 1 year
Office buildings [Member] | Top of range [member] |  |
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] |  |
Estimated useful life of right-of-use assets | 25 years | 25 years
Co Located Sites | Bottom of range [member] |  |
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] |  |
Estimated useful life of right-of-use assets | 1 year | 1 year
Co Located Sites | Top of range [member] |  |
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] |  |
Estimated useful life of right-of-use assets | 5 years | 5 years

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