Leases - Summary of Amounts Reported in Consolidated Balance Sheets for Leases (Parenthetical) (Details) - Uniti Fiber Northeast Operations and Dark Fiber IRU Contracts - Disposal Group, Held for Sale, Not qualified as Discontinued Operation $ in Millions	Dec. 31, 2020 USD ($)
Lessee Lease Description [Line Items]
ROU assets	$ 20.7
Lease liabilities	17.6
Finance lease assets	54.0
Finance lease obligations	$ 33.3