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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