Summary of Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2020
Land and land improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	20 years
Land and land improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	30 years
Buildings, building improvements, and leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	2 years
Buildings, building improvements, and leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	40 years
Substation equipment
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	30 years
Data center equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	5 years
Data center equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	10 years
Vehicles
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	7 years
Core network equipment
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	7 years
Fiber facilities | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	20 years
Fiber facilities | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	25 years
Computer equipment, furniture and fixtures | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	3 years
Computer equipment, furniture and fixtures | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	5 years
Capitalized software costs
Property, Plant and Equipment [Line Items]
Estimated useful life of property and equipment	3 years