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Revenue and Contracts in Process - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025	Jan. 01, 2025
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Accounts receivable, net, contracts with customers				$ 186.3
Contract assets	$ 52.6		$ 64.1
Contract liabilities	182.7		$ 171.9
Infrastructure
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Contract assets				106.3
Contract liabilities				$ 109.1
Contract liabilities, increase due to new projects	176.4	$ 154.1
Contract liabilities, revenue recognized	165.6	90.4
Contract assets, increase due to new projects	24.1	42.2
Contract assets, reclassified to receivables	35.6	$ 65.5
Remaining performance obligation amount	$ 1,901.0
Infrastructure \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Within One Year
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Remaining performance obligation period	1 year
Remaining performance obligation amount	$ 1,543.3
Infrastructure \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Within Three Years
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Remaining performance obligation amount	$ 357.7
Infrastructure \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-07-01 \| Within Three Years
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Remaining performance obligation period	4 years
Infrastructure \| DBMG \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Remaining performance obligation period	2 years
Spectrum Segment \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Broadcast station
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Remaining performance obligation amount	$ 8.0
Spectrum Segment \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Within One Year \| Broadcast station
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Remaining performance obligation period	1 year
Remaining performance obligation amount	$ 7.3
Spectrum Segment \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01 \| Within Three Years \| Broadcast station
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Line Items]
Remaining performance obligation period	2 years
Remaining performance obligation amount	$ 0.7