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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