Segments - Schedule of Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Total revenues and sales			$ 2,234.5	$ 1,166.9	$ 1,149.8
Intersegment costs and expenses			(1,972.5)	(579.9)	(771.9)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenues and sales			80.1	0.0	0.0
Operating Segments
Segment Reporting Information [Line Items]
Total revenues and sales			2,314.6	1,166.9	1,149.8
Intersegment costs and expenses			(80.1)	0.0	0.0
Contribution margin			1,343.8	999.3	979.4
Total segment expenses			(890.7)	(167.6)	(170.4)
Kinetic
Segment Reporting Information [Line Items]
Total revenues and sales			909.0	0.0	0.0
Kinetic | Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenues and sales			19.4	0.0	0.0
Kinetic | Operating Segments
Segment Reporting Information [Line Items]
Total revenues and sales			928.4	0.0	0.0
Compensation expenses			(160.4)	0.0	0.0
Non-compensation managed expenses			(104.9)	0.0	0.0
Revenue-driven costs			(84.2)	0.0	0.0
Network access and facilities			(84.1)	0.0	0.0
Allocated network operations expenses			(20.4)	0.0	0.0
Customer access			(9.7)	0.0	0.0
Intersegment costs and expenses			(57.1)	0.0	0.0
Contribution margin			407.6	0.0	0.0
Uniti Solutions
Segment Reporting Information [Line Items]
Total revenues and sales	$ 330.1	$ 0.0	330.1	0.0	0.0
Uniti Solutions | Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenues and sales	2.2	0.0			0.0
Uniti Solutions | Operating Segments
Segment Reporting Information [Line Items]
Total revenues and sales	332.3	0.0			0.0
Compensation expenses	(25.0)	0.0			0.0
Non-compensation managed expenses	(2.4)	0.0			0.0
Revenue-driven costs	(49.5)	0.0			0.0
Customer access	(71.8)	0.0			0.0
Intersegment costs and expenses	(19.5)	0.0			0.0
Contribution margin	164.1	0.0			0.0
Fiber Infrastructure
Segment Reporting Information [Line Items]
Total revenues and sales			995.4	1,166.9	1,149.8
Fiber Infrastructure | Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenues and sales			58.5	0.0	0.0
Fiber Infrastructure | Operating Segments
Segment Reporting Information [Line Items]
Total revenues and sales			1,053.9	1,166.9	1,149.8
Compensation expenses			(63.9)	(45.7)	(43.7)
Non-compensation managed expenses			(16.1)	(12.7)	(16.8)
Revenue-driven costs			(33.0)	(17.8)	(16.4)
Network access and facilities			(156.2)	(91.4)	(93.5)
Allocated network operations expenses			(4.4)	0.0	0.0
Customer access			(4.7)	0.0	0.0
Intersegment costs and expenses			(3.5)	0.0	0.0
Contribution margin			772.1	999.3	979.4
Service revenues
Segment Reporting Information [Line Items]
Total revenues and sales			2,171.7	1,148.8	1,133.0
Service revenues | Kinetic
Segment Reporting Information [Line Items]
Total revenues and sales			874.3	0.0	0.0
Service revenues | Uniti Solutions
Segment Reporting Information [Line Items]
Total revenues and sales	329.5	0.0			0.0
Service revenues | Fiber Infrastructure
Segment Reporting Information [Line Items]
Total revenues and sales			967.9	1,148.8	1,133.0
Sales revenues
Segment Reporting Information [Line Items]
Total revenues and sales			62.8	18.1	16.8
Sales revenues | Kinetic
Segment Reporting Information [Line Items]
Total revenues and sales			34.7	0.0	0.0
Sales revenues | Uniti Solutions
Segment Reporting Information [Line Items]
Total revenues and sales	$ 0.6	$ 0.0			0.0
Sales revenues | Fiber Infrastructure
Segment Reporting Information [Line Items]
Total revenues and sales			$ 27.5	$ 18.1	$ 16.8