Goodwill and Intangible Assets and Liabilities - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule Of Indefinite And Finite Lived Intangible Assets And Liabilities [Line Items]
Remaining weighted average amortization period of intangible assets	15 years 6 months
Remaining weighted average amortization period of intangible liabilities	18 years 7 months 6 days
Amortization	$ 4.8	$ 8.3
Estimated amortization expense for 2021	19.1
Estimated amortization expense for 2022	19.1
Estimated amortization expense for 2023	19.1
Estimated amortization expense for 2024	19.0
Estimated amortization expense for 2025	19.0
Fiber Infrastructure
Schedule Of Indefinite And Finite Lived Intangible Assets And Liabilities [Line Items]
Change in goodwill amount	$ 0.0