Goodwill and Intangibles, net (Tables)

9 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of the Changes in the Carrying Amount of Goodwill by Reporting Unit

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	12.1		—		12.1
Translation	(0.3)		—		(0.3)
Balance at September 30, 2021	$	101.4	$	21.4	$	122.8

Schedule of Indefinite-Lived Intangible Assets

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

	September 30, 2021		December 31, 2020
FCC licenses	$	106.5	$	113.0
Other	—		—
Total	$	106.5	$	113.0

Schedule of Intangible Assets Subject to Amortization

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	September 30, 2021							December 31, 2020
		Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Trade names	14 years	$	25.4		$	(5.8)	$	19.6	$	18.0		$	(4.6)	$	13.4
Customer relationships and contracts	11 years	88.3			(18.1)		70.2		36.4			(12.1)		24.3
Channel sharing arrangements	35 years	12.6			(1.0)		11.6		20.2			(1.6)		18.6
Other	8 years	8.3			(3.1)		5.2		5.5			(2.7)		2.8
Total		$	134.6		$	(28.0)	$	106.6	$	80.1		$	(21.0)	$	59.1

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

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	$	4.3
2022	17.1
2023	11.7
2024	7.9
2025	7.2
Thereafter	58.4
Total	$	106.6