Goodwill and Intangibles, net

6 Months Ended

Jun. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangibles, net

8. Goodwill and Intangibles, net

Goodwill

The carrying amount of goodwill by segment was as follows (in millions):

	Infrastructure		Spectrum		Total
Balance at December 31, 2020	$	89.6	$	21.4	$	111.0
Acquisitions	10.3		—		10.3
Translation	(0.2)		—		(0.2)
Balance at June 30, 2021	$	99.7	$	21.4	$	121.1

Indefinite-lived Intangible Assets

The carrying amount of indefinite-lived intangible assets was as follows (in millions):

	June 30, 2021		December 31, 2020
FCC licenses	$	107.5	$	113.0
Other	—		—
Total	$	107.5	$	113.0

For the six months ended June 30, 2021, FCC licenses decreased $5.5 million predominately related to the reclassification to held-for-sale as a result of our Spectrum segment entering into certain agreements to sell non-core FCC licenses.

Definite Lived Intangible Assets

The gross carrying amount and accumulated amortization of amortizable intangible assets by major intangible asset class were as follows (in millions):

	Weighted-Average Original Useful Life	June 30, 2021							December 31, 2020
		Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Trade names	14 years	$	25.4		$	(5.4)	$	20.0	$	18.0		$	(4.6)	$	13.4
Customer relationships and contracts	11 years	85.4			(14.5)		70.9		36.4			(12.1)		24.3
Channel sharing arrangements	35 years	20.1			(1.9)		18.2		20.2			(1.6)		18.6
Other	8 years	8.4			(3.0)		5.4		5.5			(2.7)		2.8
Total		$	139.3		$	(24.8)	$	114.5	$	80.1		$	(21.0)	$	59.1

Amortization expense for definite lived intangible assets was $2.3 million and $1.5 million for the three months ended June 30, 2021 and 2020, respectively, and was included in Depreciation and amortization in our Condensed Consolidated Statements of Operations.

Amortization expense for definite lived intangible assets was $3.8 million and $3.0 million for the six months ended June 30, 2021 and 2020, respectively, and was included in Depreciation and amortization in our Condensed Consolidated Statements of Operations.

Amortization

Excluding the impact of any future acquisitions, dispositions or change in foreign currency, the Company estimates the annual amortization expense of amortizable intangible assets for the next five fiscal years will be as follows (in millions):

	Estimated Amortization
2021	$	7.8
2022	15.6
2023	11.1
2024	8.0
2025	7.3
Thereafter	64.7
Total	$	114.5