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