Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The changes in the Company's goodwill consisted of the following:

(dollars in millions)	Network
Goodwill, balance as of December 31, 2022	$	570.0
Activity during the year:
Adjustments to prior year acquisition of Agile		(4.4	)
Acquisition of OTT		1.1
Goodwill, balance as of December 31, 2023 and 2024	$	566.7

Schedule of Intangible Assets

The Company’s intangible assets consisted of the following:

	December 31, 2024							December 31, 2023
	Gross							Gross
	Carrying		Accumulated			Net		Carrying		Accumulated			Net
(dollars in millions)	Amount		Amortization			Amount		Amount		Amortization			Amount
Intangible assets subject to amortization
Customer relationships	$	545.0	$	(208.2	)	$	336.8	$	545.0	$	(150.6	)	$	394.4
Trade names		22.4		(20.6	)		1.8		22.4		(15.8	)		6.6
Technology		1.1		(0.5	)		0.6		1.1		(0.3	)		0.8
Total		568.5		(229.3	)		339.2		568.5		(166.7	)		401.8
Intangible assets not subject to amortization
FCC licenses and spectrum usage rights		7.4		—			7.4		7.1		—			7.1
Perpetual licenses		6.8		—			6.8		6.8		—			6.8
Total intangible assets	$	582.7	$	(229.3	)	$	353.4	$	582.4	$	(166.7	)	$	415.7

Schedule of Estimated Useful Lives for Finite-lived Intangible Assets

The estimated useful lives for each finite-lived intangible asset class are as follows:

Customer relationships	15 years
Trade names	3 to 10 years
Technology	7 years

Schedule of Estimated Amortization Expense

The annual estimated amortization expense for future years is as follows:

(dollars in millions)
Year ended December 31,
2025	$	53.4
2026		48.9
2027		44.4
2028		39.8
2029		35.2
Thereafter		117.5
Total	$	339.2