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Fair Value of Financial Instruments - Other Investments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 39 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 21, 2024
Dec. 31, 2023
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]        
Equity method investments, net investment $ 327.0     $ 319.0
Subcontracting Arrangements | Related Party        
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]        
Accounts receivable, after allowance for credit loss 0.2     0.4
Telecommunications Equity Method Investees        
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]        
Equity method investments, net investment 22.0     21.0
Telecommunications Equity Method Investees | Subcontracting Arrangements | Related Party        
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]        
Operating costs and expenses 1.0 $ 0.4    
Accounts payable 0.3     0.1
Telecommunications Equity Method Investees | Employee Leasing Expense Arrangement        
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]        
Operating costs and expenses 0.0      
Telecommunications Equity Method Investees | Advanced Receivable Arrangement        
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]        
Operating costs and expenses 0.1      
Telecommunications Equity Method Investees | Employee Leasing and Advanced Receivable Arrangement | Related Party        
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]        
Accounts receivable, after allowance for credit loss 4.2     4.0
FM Tech        
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]        
Equity method investments, net investment $ 18.0     18.0
Equity method investments, ownership percentage 50.00%      
Certain Entities, Each Accounted for Using Equity Method Investments        
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]        
Equity method investments, net investment $ 3.0     $ 3.0
Equity method investments, ownership percentage 49.00%     49.00%
Line of credit, amount drawn $ 3.0     $ 3.0
Certain Entities, Each Accounted for Using Equity Method Investments | Related Party        
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]        
Operating costs and expenses 0.1 0.3    
Certain Entities, Each Accounted for Using Equity Method Investments | Other Current Assets        
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]        
Line of credit, amount drawn $ 0.0     $ 0.0
Confluence        
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]        
Equity method investments, ownership percentage 75.00%      
Equity method investments, equity contributions $ 0.1 $ 0.2 $ 2.1  
Financing commitments (up to) $ 2.5