Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details)		3 Months Ended	12 Months Ended
	May 03, 2024 shares	Mar. 31, 2025 USD ($) shares	Dec. 31, 2025 USD ($) $ / shares	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Jan. 31, 2024 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Depreciation expense			$ 522,800,000	$ 285,200,000	$ 280,800,000
Net income (loss) attributable to shareholders			$ 1,304,700,000	$ 93,400,000	$ (81,700,000)
Basic (in dollars per share) | $ / shares			$ 6.61	$ 0.64	$ (0.58)
Diluted earnings (loss) per common share (in dollars per share) | $ / shares			$ 4.87	$ 0.64	$ (0.58)
Accounts receivable, amount due from customer payment period			30 days
Unbilled revenue			$ 16,700,000	$ 3,500,000
Goodwill impairment			0	0	$ 204,000,000.0
Interest costs capitalized			9,700,000	2,800,000	1,300,000
Aggregate carrying amount of asset retirement obligations			66,400,000	16,700,000
Asset retirement obligations liabilities incurred			100,000	100,000
Asset retirement obligation, liabilities settled			2,900,000
Asset retirement obligations accretion expense recognized			2,300,000	1,000,000.0	2,800,000
Grants receivable			108,100,000	0
Advertising expense			$ 25,200,000	$ 1,600,000	$ 1,500,000
OP unit conversion ratio			1
Dividends paid (in dollars per share) | $ / shares			$ 0	$ 0.75	$ 0.75
Windstream
Summary Of Significant Accounting Policies [Line Items]
Aggregate carrying amount of asset retirement obligations			$ 50,200,000
Depreciation and amortization
Summary Of Significant Accounting Policies [Line Items]
Investment report period lag			30 days
Common Stock
Summary Of Significant Accounting Policies [Line Items]
Exchange of noncontrolling interest (in shares) | shares	0.6029
Cash Share Exchange
Summary Of Significant Accounting Policies [Line Items]
Exchange of noncontrolling interest (in shares) | shares		14,722		91,188	0
Cash Share Exchange | Common Stock
Summary Of Significant Accounting Policies [Line Items]
Exchange of noncontrolling interest (in shares) | shares				76,466
Cash Share Purchase
Summary Of Significant Accounting Policies [Line Items]
Exchange of noncontrolling interest (in shares) | shares				14,722
Exchange of noncontrolling interest		$ 100,000		$ 100,000
Old Uniti
Summary Of Significant Accounting Policies [Line Items]
Depreciation expense			$ 55,700,000	47,000,000.0	$ 47,000,000.0
Property, plant and equipment, net			1,100,000,000
Deferred revenue, revenue recognized			$ 30,400,000	50,900,000	50,900,000
Macquarie Asset Management | Disposal Group, Held for Sale, Not qualified as Discontinued Operation | CableSouth Transaction
Summary Of Significant Accounting Policies [Line Items]
Cash consideration						$ 40,000,000.0
Pretax gain from sale				$ 19,000,000.0
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]				Gain (Loss) on Disposition of Assets
MIP IV MidWest Fiber Parent LLC | Discontinued Operations, Disposed of by Sale
Summary Of Significant Accounting Policies [Line Items]
Cash consideration						$ 40,000,000.0
Pretax gain from sale				$ 2,600,000
FCC Spectrum licenses
Summary Of Significant Accounting Policies [Line Items]
Initial term			10 years
Uniti Fiber
Summary Of Significant Accounting Policies [Line Items]
Goodwill impairment					$ 204,000,000.0
Change in Accounting Method Accounted for as Change in Estimate
Summary Of Significant Accounting Policies [Line Items]
Depreciation expense			$ 6,700,000
Net income (loss) attributable to shareholders			$ 5,900,000
Basic (in dollars per share) | $ / shares			$ 0.03
Diluted earnings (loss) per common share (in dollars per share) | $ / shares			$ 0.03