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Goodwill and Intangible Assets and Liabilities
 9 Months Ended
Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets and Liabilities Goodwill and Intangible Assets and Liabilities:
Changes in the carrying amount of goodwill occurring during the nine months ended September 30, 2025 are as follows:

(Millions) KineticUniti SolutionsFiber Infrastructure (a)Total
Goodwill at December 31, 2024 $— $— $672.9 $672.9 
Accumulated impairment charges as of
December 31, 2024		— — (515.5)(515.5)
Balance at December 31, 2024 — — 157.4 157.4 
Acquisition of Windstream768.3 193.3 45.3 1,006.9 
Goodwill at September 30, 2025768.3 193.3 718.2 1,679.8 
Accumulated impairment charges as of
September 30, 2025		— — (515.5)(515.5)
Balance at September 30, 2025$768.3 $193.3 $202.7 $1,164.3 

(a)Prior to the Merger, all goodwill related to the former Uniti Fiber segment. In connection with the Merger, the former Uniti Fiber and Uniti Leasing segments were combined with the CLEC portion of Windstream’s acquired wholesale business and renamed Fiber Infrastructure.

Indefinite-lived intangible assets were as follows on September 30, 2025:

(Millions)
FCC Spectrum licenses$78.9 

Windstream acquired wireless spectrum licenses in the 3.5, 24, 28 and 37 GHz bands in auctions conducted by the FCC during 2020 and 2019 for $78.9 million. The spectrum licenses have an initial term of 10.0 years and are subject to renewal by the FCC. Currently, there are no legal, regulatory, contractual, competitive, economic or other factors that would limit the useful life of the spectrum; and therefore, the licenses are considered indefinite-lived intangible assets. As of September 30, 2025, the weighted average remaining renewal period for the acquired spectrum licenses was 4.9 years.

Carrying value of finite-lived intangible assets and liabilities were as follows:

September 30, 2025December 31, 2024
(Millions)
Original
Cost
Accumulated
Amortization
Net Carrying Value
Original
Cost
Accumulated
Amortization		Net Carrying Value
Finite-lived intangible assets:
Customer relationships$750.0 $(41.9)$708.1 $— $— $— 
Customer lists416.1 (191.4)224.7 416.1 (174.3)241.8 
IPv4 addresses (a)162.8 (1.6)161.2 — — — 
Trade name115.0 (1.3)113.7 — — — 
Contracts52.5 (32.8)19.7 52.5 (27.9)24.6 
Rights of way48.6 (2.5)46.1 10.5 (1.5)9.0 
Total$1,545.0 $(271.5)$1,273.5 $479.1 $(203.7)$275.4 
Finite-lived intangible liabilities:
Below-market leases$15.2 $(9.5)$5.7 $191.2 (45.5)145.7 

(a)Subsequent to August 1, 2025, the Company sold certain unused IPv4 addresses with a net carrying value of $2.8 million and received cash proceeds of $3.1 million.
The amortization methodology and useful lives for finite-lived intangible assets and liabilities were as follows:

Amortization MethodologyEstimated Useful Life
Intangible Assets:
Customer relationshipssum of years digits
5 years
Customer listsstraight-line
14-30 years
IPv4 addressesstraight-line
17.5 years
Trade namestraight-line
15 years
Contractsstraight-line
8 years
Rights of waystraight-line
9.4 - 30.0 years
Intangible Liabilities:
Below-market leasesstraight-line
8-20 years

As of September 30, 2025, the remaining weighted average amortization period of the Company’s intangible assets was 4.8 years for customer relationships, 12.7 years for customer lists, 17.3 years for IPv4 addresses, 14.8 years for the trade name, 3.0 years for contracts, and 12.2 years for rights of way. As of September 30, 2025, the total remaining weighted average amortization period for total intangible assets was 8.9 years.
Amortization expense for the three and nine months ended September 30, 2025 was $52.9 million and $67.7 million, respectively. Amortization expense for the three and nine months ended September 30, 2024 was $7.4 million and $22.3 million, respectively.

Amortization expense for intangible assets subject to amortization is estimated to be as follows for each of the years ended December 31:

Year(Millions)
2025 (excluding the nine months ended September 30, 2025)$75.4 
2026279.7 
2027229.8 
2028178.2 
2029123.2 
Thereafter387.2 
Total$1,273.5 

We recognize the amortization of below-market leases in revenue. Revenue related to the amortization of the below-market leases for the three and nine months ended September 30, 2025 was $1.2 million and $6.6 million, respectively. Revenue related to the amortization of the below-market leases for the three and nine months ended September 30, 2024 was $2.7 million and $8.0 million, respectively. As of September 30, 2025, the remaining weighted average amortization period of the Company’s intangible liabilities was 3.0 years. Revenue due to the amortization of the below-market leases is estimated to be as follows for each of the years ended December 31:

Year(Millions)
2025 (excluding the nine months ended September 30, 2025)$0.5 
20261.9 
20271.9 
20281.4 
Total$5.7