Merger and Purchase Price Allocation - Schedule of Preliminary Fair Values of the Assets Acquired and Liabilities (Details) - USD ($) $ in Millions	Aug. 01, 2025	Sep. 30, 2025	Dec. 31, 2024
Fair value of assets acquired:
Goodwill		$ 1,164.3	$ 157.4
Fair value of liabilities assumed:
Operating lease right-of-use assets, fair value adjustment	$ 1.0
Expected long-term rate of return on pension plan assets	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:
Targeted asset allocation, percentage	49.00%
Fixed Income Securities
Fair value of liabilities assumed:
Targeted asset allocation, percentage	32.00%
Alternative Investments
Fair value of liabilities assumed:
Targeted asset allocation, percentage	19.00%
Minimum
Fair value of liabilities assumed:
Incremental borrowing rate	4.35%
Maximum
Fair value of liabilities assumed:
Incremental borrowing rate	6.82%
Windstream
Fair value of assets acquired:
Cash, cash equivalents and restricted cash	$ 141.2
Accounts receivable	317.6
Prepaid expenses and other current assets	288.1
Property, plant and equipment	3,545.7
Goodwill	1,006.9
Operating lease right-of-use assets	431.9
Other assets	52.7
Total assets acquired	6,931.7
Fair value of liabilities assumed:
Current portion of operating lease obligations	107.4
Accounts payable	124.7
Deferred revenue	132.1
Other current liabilities	419.9
Long-term debt	2,841.2
Non-current operating lease obligations	315.2
Deferred income taxes	294.5
Noncurrent deferred revenue	88.5
Pension obligation	103.6
Other liabilities	128.0
Total liabilities assumed	4,555.1
Total merger consideration	$ 2,376.6
Windstream | Minimum
Fair value of liabilities assumed:
Depreciable Lives	2 years
Windstream | Maximum
Fair value of liabilities assumed:
Depreciable Lives	20 years
Windstream | Customer relationships
Fair value of assets acquired:
Intangible asset excluding goodwill	$ 750.0
Fair value of liabilities assumed:
Useful life	5 years
Windstream | IPv4 addresses
Fair value of assets acquired:
Intangible asset excluding goodwill	$ 165.6
Fair value of liabilities assumed:
Useful life	17 years 6 months
Windstream | Trade name
Fair value of assets acquired:
Intangible asset excluding goodwill	$ 115.0
Fair value of liabilities assumed:
Useful life	15 years
Windstream | Spectrum licenses
Fair value of assets acquired:
Intangible asset excluding goodwill	$ 78.9
Windstream | Rights of way
Fair value of assets acquired:
Intangible asset excluding goodwill	$ 38.1
Fair value of liabilities assumed:
Useful life	9 years 4 months 24 days