Goodwill and Intangible Assets and Liabilities - Schedule of Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Goodwill [Line Items]
Goodwill gross	$ 1,679.8	$ 672.9
Accumulated impairment charges	(515.5)	(515.5)
Goodwill	1,164.3	157.4
Acquisition of Windstream	1,006.9
Kinetic
Goodwill [Line Items]
Goodwill gross	768.3	0.0
Accumulated impairment charges	0.0	0.0
Goodwill	768.3	0.0
Acquisition of Windstream	768.3
Uniti Solutions
Goodwill [Line Items]
Goodwill gross	193.3	0.0
Accumulated impairment charges	0.0	0.0
Goodwill	193.3	0.0
Acquisition of Windstream	193.3
Fiber Infrastructure
Goodwill [Line Items]
Goodwill gross	718.2	672.9
Accumulated impairment charges	(515.5)	(515.5)
Goodwill	202.7	$ 157.4
Acquisition of Windstream	$ 45.3