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Revenue and Contracts in Process - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Jan. 01, 2024
Revenue from External Customer [Line Items]
Accounts receivable, net, contracts with customers				$ 273.2
Contract assets	$ 135.3		$ 106.3
Contract liabilities	95.3		$ 109.1
Infrastructure
Revenue from External Customer [Line Items]
Contract assets				118.6
Contract liabilities				$ 153.5
Contract assets, increase due to new projects	74.6	$ 15.7
Contract assets, reclassified to receivables	45.6	52.1
Contract liabilities, increase due to new projects	54.0	62.9
Contract liabilities, revenue recognized	67.8	$ 91.0
Remaining performance obligation amount	$ 1,357.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01 | Infrastructure | Within One Year
Revenue from External Customer [Line Items]
Remaining performance obligation period	1 year
Remaining performance obligation amount	$ 1,058.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01 | Infrastructure | Within Three Years
Revenue from External Customer [Line Items]
Remaining performance obligation period	5 years
Remaining performance obligation amount	$ 299.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01 | Spectrum | Broadcast station
Revenue from External Customer [Line Items]
Remaining performance obligation amount	$ 14.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01 | Spectrum | Broadcast station | Within One Year
Revenue from External Customer [Line Items]
Remaining performance obligation period	1 year
Remaining performance obligation amount	$ 8.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01 | Spectrum | Broadcast station | Within Three Years
Revenue from External Customer [Line Items]
Remaining performance obligation period	3 years
Remaining performance obligation amount	$ 5.8
DBMG | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01 | Infrastructure
Revenue from External Customer [Line Items]
Remaining performance obligation period	2 years

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