Merger and Purchase Price Allocation - Narrative (Details) $ in Millions		3 Months Ended		9 Months Ended
	Aug. 01, 2025 USD ($) agreements	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)
Business Combination [Line Items]
Gain on settlement of preexisting relationships		$ 1,685.4	$ 0.0	$ 1,685.4	$ 0.0
Operating income		(42.6)	137.3	248.1	439.4
Uniti Group, PreMerger Assets Settled
Business Combination [Line Items]
Number of lease agreements | agreements	2
Useful life	20 years
Operating lease assets, including discontinued operation	$ 559.0
Asset purchase agreement, liabilities, including discontinued operation	(60.0)
Other lease agreement assets, including discontinued operation	0.1
Uniti Group, PreMerger Assets Derecognized
Business Combination [Line Items]
Disposal group, accounts receivable and other current assets		15.3		15.3
Disposal group, other assets		88.2		88.2
Disposal group, operating lease right of use assets		25.5		25.5
Uniti Group, PreMerger Liabilites Derecognized
Business Combination [Line Items]
Disposal group, deferred revenue		1,166.8		1,166.8
Disposal group, intangible liabilities		133.5		133.5
Disposal group, operating lease obligation		11.4		11.4
Disposal group, accounts payable and other current liabilities		3.6		3.6
Windstream
Business Combination [Line Items]
Total merger consideration	$ 2,376.6
Gain on settlement of preexisting relationships		1,685.4
Total		157.7	14.4	179.0	31.1
Business Combination, Acquiree's Revenue since Acquisition Date, Actual		550.9		550.9
Business Combination, Acquiree's Earnings (Loss) since Acquisition Date, Actual		104.4		104.4
Windstream | Other Transaction Related Costs
Business Combination [Line Items]
Total		$ 8.5	$ 2.0	12.4	$ 3.7
Windstream | Other Transaction Related Costs | Other current liabilities
Business Combination [Line Items]
Total				$ 13.7