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Revenue and Contracts in Process - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Jan. 01, 2023	Jan. 01, 2022
Revenue from External Customer [Line Items]
Accounts receivable, net	$ 269.3	$ 278.4	$ 250.4	$ 254.9
Contract assets	82.2	118.6
Contract liabilities	125.4	$ 153.5
Infrastructure
Revenue from External Customer [Line Items]
Contract assets			165.1
Contract liabilities			$ 98.6
Contract assets, increase due to new projects	15.7
Contract assets, reclassified to receivables	52.1
Contract liabilities, increase due to new projects	62.9
Contract liabilities, revenue recognized	91.0
Remaining performance obligation amount	$ 925.2
Infrastructure | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 | Within One Year
Revenue from External Customer [Line Items]
Remaining performance obligation period	1 year
Remaining performance obligation amount	$ 697.8
Infrastructure | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 | Within Five Years
Revenue from External Customer [Line Items]
Remaining performance obligation period	5 years
Remaining performance obligation amount	$ 227.4
Infrastructure | DBMG | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Revenue from External Customer [Line Items]
Remaining performance obligation period	3 years
Spectrum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 | Broadcast station
Revenue from External Customer [Line Items]
Remaining performance obligation amount	$ 15.3
Spectrum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 | Broadcast station | Within One Year
Revenue from External Customer [Line Items]
Remaining performance obligation period	1 year
Remaining performance obligation amount	$ 8.5
Spectrum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 | Broadcast station | Within Five Years
Revenue from External Customer [Line Items]
Remaining performance obligation period	3 years
Remaining performance obligation amount	$ 6.8

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