Goodwill and Intangibles, net (Tables)

6 Months Ended

Jun. 30, 2019

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 were as follows (in millions):



	Construction			Marine Services		Energy		Telecom			Insurance		Broadcasting			Total
Balance at December 31, 2018		$	82.2	$	14.3	$	2.1	$	4.4		$	47.3		$	21.4	$	171.7
Measurement period adjustment		7.1		—		—		—			—			—		7.1
Impairments		—		—		—		(0.4		)	—			—		(0.4		)
Balance at June 30, 2019		$	89.3	$	14.3	$	2.1	$	4.0		$	47.3		$	21.4	$	178.4

Schedule of Indefinite-Lived Intangible Assets

Balances of indefinite-lived intangible assets as of June 30, 2019 and December 31, 2018 were as follows (in millions):



	June 30, 2019		December 31, 2018
FCC licenses	$	132.6	$	120.6
State licenses	2.5		2.5
Total	$	135.1	$	123.1

Schedule of Intangible Assets Subject to Amortization

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



	Weighted-Average Original Useful Life	June 30, 2019							December 31, 2018
	Weighted-Average Original Useful Life	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Trade names	13 Years	$	26.0	$	(7.0	)	$	19.0	$	25.9	$	(5.9	)	$	20.0
Customer relationships	10 Years	53.6		(11.5		)	42.1		53.6		(7.2		)	46.4
Channel sharing arrangements	40 Years	25.2		(0.5		)	24.7		25.2		—			25.2
Developed technology	5 Years	1.2		(1.2		)	—		1.2		(1.2		)	—
Other	6 Years	5.5		(1.5		)	4.0		5.5		(1.0		)	4.5
Total		$	111.5	$	(21.7	)	$	89.8	$	111.4	$	(15.3	)	$	96.1

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):



Fiscal Year	Estimated Amortization Expense
2019	$	5.5
2020	$	8.1
2021	$	7.9
2022	$	7.7
2023	$	6.9