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Revenue and Contracts in Process - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Jan. 01, 2024
Revenue from External Customer [Line Items]
Accounts receivable, net, contracts with customers				$ 273.2
Contract assets	$ 83.0		$ 106.3
Contract liabilities	172.8		$ 109.1
Infrastructure
Revenue from External Customer [Line Items]
Contract assets				118.6
Contract liabilities				$ 153.5
Contract assets, increase due to new projects	42.2	$ 45.0
Contract assets, reclassified to receivables	65.5	62.4
Contract liabilities, increase due to new projects	154.1	57.4
Contract liabilities, revenue recognized	90.4	$ 138.1
Remaining performance obligation amount	$ 1,242.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01 | Infrastructure | Within One Year
Revenue from External Customer [Line Items]
Remaining performance obligation period	1 year
Remaining performance obligation amount	$ 1,065.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01 | Infrastructure | Within Three Years
Revenue from External Customer [Line Items]
Remaining performance obligation period	5 years
Remaining performance obligation amount	$ 176.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01 | Spectrum | Broadcast station
Revenue from External Customer [Line Items]
Remaining performance obligation amount	$ 12.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01 | Spectrum | Broadcast station | Within One Year
Revenue from External Customer [Line Items]
Remaining performance obligation period	1 year
Remaining performance obligation amount	$ 8.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01 | Spectrum | Broadcast station | Within Three Years
Revenue from External Customer [Line Items]
Remaining performance obligation period	3 years
Remaining performance obligation amount	$ 4.1
DBMG | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01 | Infrastructure
Revenue from External Customer [Line Items]
Remaining performance obligation period	2 years

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