Revenues - Schedule of Revenues Disaggregated by Category (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation Of Revenue [Line Items]
Operating lease income	$ 124.5	$ 230.9	$ 597.0	$ 688.4
Other service and sales revenues	48.5	3.0	51.1	3.0
Total revenues and sales	722.6	292.2	1,317.3	873.6
Fiber subscriber
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	77.7	0.0	77.7	0.0
DSL subscriber and other
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	102.7	0.0	102.7	0.0
Managed services
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	121.7	0.0	121.7	0.0
TDM
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	8.7	0.0	8.7	0.0
Business services
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	66.4	0.0	66.4	0.0
Switched access
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	2.2	0.0	2.2	0.0
Uniti Fiber
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	55.7	54.7	167.0	167.6
Wholesale
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	100.8	1.9	103.7	5.1
Total service revenues accounted for under ASC 606
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	535.9	56.6	650.1	172.7
Total revenues and sales	695.3	287.5	1,282.0	861.1
Sales revenues
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	13.7	1.7	19.1	9.5
Total revenues and sales	27.3	4.7	35.3	12.5
Total revenues and sales accounted for under ASC 606
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	549.6	58.3	669.2	182.2
Kinetic
Disaggregation Of Revenue [Line Items]
Operating lease income	17.7	0.0	17.7	0.0
Other service and sales revenues	27.1	0.0	27.1	0.0
Total revenues and sales	360.3	0.0	360.3	0.0
Kinetic | Fiber subscriber
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	77.7	0.0	77.7	0.0
Kinetic | DSL subscriber and other
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	102.7	0.0	102.7	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	0.0
Kinetic | TDM
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	0.0	0.0	0.0	0.0
Kinetic | Business services
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	66.4	0.0	66.4	0.0
Kinetic | Switched access
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	2.2	0.0	2.2	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	0.0
Kinetic | Wholesale
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	54.8	0.0	54.8	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	303.8	0.0	303.8	0.0
Total revenues and sales	348.6	0.0	348.6	0.0
Kinetic | Sales revenues
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	11.7	0.0	11.7	0.0
Total revenues and sales	11.7	0.0	11.7	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	315.5	0.0	315.5	0.0
Uniti Solutions
Disaggregation Of Revenue [Line Items]
Operating lease income	0.1	0.0	0.1	0.0
Other service and sales revenues	4.8	0.0	4.8	0.0
Total revenues and sales	135.7	0.0	135.7	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	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	0.0
Uniti Solutions | Managed services
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	121.7	0.0	121.7	0.0
Uniti Solutions | TDM
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	8.7	0.0	8.7	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	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	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	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	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	130.4	0.0	130.4	0.0
Total revenues and sales	135.3	0.0	135.3	0.0
Uniti Solutions | Sales revenues
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	0.4	0.0	0.4	0.0
Total revenues and sales	0.4	0.0	0.4	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	130.8	0.0	130.8	0.0
Fiber Infrastructure
Disaggregation Of Revenue [Line Items]
Operating lease income	106.7	230.9	579.2	688.4
Other service and sales revenues	16.6	3.0	19.2	3.0
Total revenues and sales	226.6	292.2	821.3	873.6
Fiber Infrastructure | Fiber subscriber
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	0.0	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	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	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	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	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	0.0
Fiber Infrastructure | Uniti Fiber
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	55.7	54.7	167.0	167.6
Fiber Infrastructure | Wholesale
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	46.0	1.9	48.9	5.1
Fiber Infrastructure | Total service revenues accounted for under ASC 606
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	101.7	56.6	215.9	172.7
Total revenues and sales	211.4	287.5	798.1	861.1
Fiber Infrastructure | Sales revenues
Disaggregation Of Revenue [Line Items]
Total revenues and sales accounted for under ASC 606	1.6	1.7	7.0	9.5
Total revenues and sales	15.2	4.7	23.2	12.5
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	$ 103.3	$ 58.3	$ 222.9	$ 182.2