Revenue

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Revenue

4. Revenue

Revenue from contracts with customers consist of the following (in millions):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Revenue
Infrastructure	$	383.0	$	160.8	$	776.3	$	509.6
Spectrum	10.2		9.7		31.3		29.3
Life Sciences	1.6		—		2.8		—
Total revenue	$	394.8	$	170.5	$	810.4	$	538.9

Accounts receivables, net from contracts with customers consist of the following (in millions):

	September 30, 2021		December 31, 2020
Accounts receivables with customers
Infrastructure	$	405.4	$	168.5
Spectrum	9.0		7.3
Life Sciences	0.2		—
Total accounts receivables with customers	$	414.6	$	175.8

Infrastructure Segment

The following table disaggregates DBMG's revenue by market (in millions):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Commercial	$	207.0	$	48.2	$	343.3	$	165.0
Industrial	92.9		52.2		207.9		170.6
Transportation	16.0		18.2		40.0		58.0
Government	15.9		17.5		54.6		37.2
Leisure	4.8		8.2		16.5		35.5
Healthcare	17.1		7.9		37.2		20.6
Convention	23.4		1.2		51.7		5.0
Other	5.9		7.3		25.1		17.0
Total revenue from contracts with customers	383.0		160.7		776.3		508.9
Other revenue	—		0.1		—		0.7
Total Infrastructure segment revenue	$	383.0	$	160.8	$	776.3	$	509.6

Contract assets and contract liabilities consisted of the following (in millions):

	September 30, 2021		December 31, 2020
Contract assets	$	72.5	$	55.6
Contract liabilities	$	(161.4)	$	(52.2)

The change in contract assets is a result of the recording of $47.7 million of contract assets on uncompleted contracts driven by new commercial projects and $1.9 million of contract assets on uncompleted contracts for projects acquired in the Banker Steel acquisition, offset by $32.7 million of contract assets on uncompleted contracts transferred to receivables from contract assets recognized at the beginning of the period. The change in contract liabilities is a result of periodic contract liabilities on uncompleted contracts of $145.3 million driven largely by new commercial projects and $55.0 million of contract liabilities on uncompleted contracts for projects acquired as a result of the Banker Steel acquisition, offset by revenue recognized that was included in the contract liability balance at the beginning of the period in the amount of $91.1 million.

The transaction price allocated to remaining unsatisfied performance obligations consisted of the following (in millions):

	Within one year		Within five years		Total
Commercial	$	535.9	$	543.2	$	1,079.1
Industrial	178.2		—		178.2
Transportation	31.3		16.1		47.4
Government	34.9		—		34.9
Leisure	16.6		2.0		18.6
Healthcare	57.3		—		57.3
Convention	119.8		50.0		169.8
Other	12.7		—		12.7
Remaining unsatisfied performance obligations	$	986.7	$	611.3	$	1,598.0

DBMG includes an additional $7.9 million in its backlog that is not included in the remaining unsatisfied performance obligations noted above. This backlog represents commitments under master service agreements that are estimated amounts of work to be performed based on customer communications, historic experience and knowledge of our customers' intentions.

Life Sciences Segment

The following table disaggregates the Life Sciences segment's revenue by type (in millions):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Systems and consumables revenue	$	1.6	$	—	$	2.8	$	—
Total Life Sciences segment revenue	$	1.6	$	—	$	2.8	$	—

Spectrum Segment

The following table disaggregates the Spectrum segment's revenue by type (in millions):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Broadcast station	$	4.7	$	4.0	$	13.6	$	11.3
Network advertising	4.2		4.1		13.7		13.1
Network distribution	0.8		1.0		2.5		3.0
Other	0.5		0.6		1.5		1.9
Total Spectrum segment revenue	$	10.2	$	9.7	$	31.3	$	29.3

The transaction price allocated to remaining unsatisfied performance obligations consisted of $1.0 million, $5.9 million, and $0.1 million of network advertising, broadcasting station revenues, and other revenues, respectively, of which $4.6 million is expected to be recognized within one year and $2.4 million is expected to be recognized within five years.