Merger and Purchase Price Allocation - Schedule of Preliminary Fair Values of the Assets Acquired and Liabilities (Details) - USD ($) $ in Millions		12 Months Ended
	Aug. 01, 2025	Dec. 31, 2025	Dec. 31, 2024
Fair value of assets acquired:
Goodwill		$ 1,158.3	$ 157.4
Fair value of liabilities assumed:
Operating lease right-of-use assets, fair value adjustment	$ 1.0
Expected return on plan assets	7.75%	7.75%
Discount rate	5.64%
Net pension benefit obligation	$ 103.6
Projected benefit obligations	545.2
Fair value of plan assets	$ 441.6
Equity securities
Fair value of liabilities assumed:
Target allocation	49.00%	51.00%
Fixed Income Securities
Fair value of liabilities assumed:
Target allocation	32.00%
Alternative investments
Fair value of liabilities assumed:
Target allocation	19.00%	12.00%
Minimum
Fair value of liabilities assumed:
Incremental borrowing rate	4.35%
Minimum | Equity securities
Fair value of liabilities assumed:
Target allocation		43.50%
Minimum | Alternative investments
Fair value of liabilities assumed:
Target allocation		19.80%
Maximum
Fair value of liabilities assumed:
Incremental borrowing rate	6.82%
Maximum | Equity securities
Fair value of liabilities assumed:
Target allocation		58.10%
Maximum | Alternative investments
Fair value of liabilities assumed:
Target allocation		5.20%
Windstream
Fair value of assets acquired:
Cash, cash equivalents and restricted cash	$ 141.2
Accounts receivable	315.6
Prepaid expenses and other current assets	283.3
Property, plant and equipment	3,531.0
Goodwill	1,000.9
Operating lease right-of-use assets	431.9
Other assets	52.7
Total assets acquired	6,925.0
Fair value of liabilities assumed:
Current portion of operating lease obligations	107.4
Accounts payable	125.1
Deferred revenue	132.1
Other current liabilities	417.3
Long-term debt	2,841.2
Non-current operating lease obligations	315.2
Deferred income taxes	290.2
Noncurrent deferred revenue	88.3
Pension obligation	103.6
Other liabilities	128.0
Total liabilities assumed	4,548.4
Total merger consideration	$ 2,376.6
Windstream | Minimum
Fair value of liabilities assumed:
Depreciable lives	1 year
Windstream | Maximum
Fair value of liabilities assumed:
Depreciable lives	40 years
Windstream | Customer relationships
Fair value of assets acquired:
Identifiable intangible asset, excluding goodwill	$ 750.0
Fair value of liabilities assumed:
Useful life	5 years
Windstream | IPv4 addresses
Fair value of assets acquired:
Identifiable intangible asset, excluding goodwill	$ 186.4
Fair value of liabilities assumed:
Useful life	17 years 6 months
Windstream | Trade name
Fair value of assets acquired:
Identifiable intangible asset, excluding goodwill	$ 115.0
Fair value of liabilities assumed:
Useful life	15 years
Windstream | FCC Spectrum licenses
Fair value of assets acquired:
Identifiable intangible asset, excluding goodwill	$ 78.9
Windstream | Rights of way
Fair value of assets acquired:
Identifiable intangible asset, excluding goodwill	$ 38.1
Fair value of liabilities assumed:
Useful life	9 years 4 months 24 days