Revenues - Schedule of Revenues Disaggregated by Category (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
Disaggregation Of Revenue [Line Items]
Operating lease income			$ 669.4	$ 921.4	$ 910.9
Other service and sales revenues			103.7	7.8	0.9
Total revenues and sales			2,234.5	1,166.9	1,149.8
Fiber subscriber
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			195.4	0.0	0.0
DSL subscriber and other
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			257.0	0.0	0.0
Managed services
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			299.0	0.0	0.0
TDM
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			18.7	0.0	0.0
Business services
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			165.7	0.0	0.0
Switched access
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			5.5	0.0	0.0
Uniti Fiber
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			226.5	220.9	215.2
Wholesale
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			247.1	6.5	6.9
Total service revenues accounted for under ASC 606
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			1,414.9	227.4	222.1
Total revenues and sales			2,171.7	1,148.8	1,133.0
Sales revenues
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			46.5	10.3	15.9
Total revenues and sales			62.8	18.1	16.8
Total revenues and sales accounted for under ASC 606
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			1,461.4	237.7	238.0
Kinetic
Disaggregation Of Revenue [Line Items]
Operating lease income			43.8	0.0	0.0
Other service and sales revenues			70.2	0.0	0.0
Total revenues and sales			909.0	0.0	0.0
Kinetic | Fiber subscriber
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			195.4	0.0	0.0
Kinetic | DSL subscriber and other
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			257.0	0.0	0.0
Kinetic | Managed services
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			0.0	0.0	0.0
Kinetic | TDM
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			0.0	0.0	0.0
Kinetic | Business services
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			165.7	0.0	0.0
Kinetic | Switched access
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			5.5	0.0	0.0
Kinetic | Uniti Fiber
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			0.0	0.0	0.0
Kinetic | Wholesale
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			136.7	0.0	0.0
Kinetic | Total service revenues accounted for under ASC 606
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			760.3	0.0	0.0
Total revenues and sales			874.3	0.0	0.0
Kinetic | Sales revenues
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			34.7	0.0	0.0
Total revenues and sales			34.7	0.0	0.0
Kinetic | Total revenues and sales accounted for under ASC 606
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			795.0	0.0	0.0
Uniti Solutions
Disaggregation Of Revenue [Line Items]
Operating lease income			0.2	0.0	0.0
Other service and sales revenues			11.6	0.0	0.0
Total revenues and sales	$ 330.1	$ 0.0	330.1	0.0	0.0
Uniti Solutions | Fiber subscriber
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			0.0	0.0	0.0
Uniti Solutions | DSL subscriber and other
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			0.0	0.0	0.0
Uniti Solutions | Managed services
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			299.0	0.0	0.0
Uniti Solutions | TDM
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			18.7	0.0	0.0
Uniti Solutions | Business services
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			0.0	0.0	0.0
Uniti Solutions | Switched access
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			0.0	0.0	0.0
Uniti Solutions | Uniti Fiber
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			0.0	0.0	0.0
Uniti Solutions | Wholesale
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			0.0	0.0	0.0
Uniti Solutions | Total service revenues accounted for under ASC 606
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			317.7	0.0	0.0
Total revenues and sales	329.5	0.0			0.0
Uniti Solutions | Sales revenues
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			0.6	0.0	0.0
Total revenues and sales	$ 0.6	$ 0.0			0.0
Uniti Solutions | Total revenues and sales accounted for under ASC 606
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			318.3	0.0	0.0
Fiber Infrastructure
Disaggregation Of Revenue [Line Items]
Operating lease income			625.4	921.4	910.9
Other service and sales revenues			21.9	7.8	0.9
Total revenues and sales			995.4	1,166.9	1,149.8
Fiber Infrastructure | Fiber subscriber
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			0.0	0.0	0.0
Fiber Infrastructure | DSL subscriber and other
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			0.0	0.0	0.0
Fiber Infrastructure | Managed services
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			0.0	0.0	0.0
Fiber Infrastructure | TDM
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			0.0	0.0	0.0
Fiber Infrastructure | Business services
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			0.0	0.0	0.0
Fiber Infrastructure | Switched access
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			0.0	0.0	0.0
Fiber Infrastructure | Uniti Fiber
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			226.5	220.9	215.2
Fiber Infrastructure | Wholesale
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			110.4	6.5	6.9
Fiber Infrastructure | Total service revenues accounted for under ASC 606
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			336.9	227.4	222.1
Total revenues and sales			967.9	1,148.8	1,133.0
Fiber Infrastructure | Sales revenues
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			11.2	10.3	15.9
Total revenues and sales			27.5	18.1	16.8
Fiber Infrastructure | Total revenues and sales accounted for under ASC 606
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606			$ 348.1	$ 237.7	$ 238.0