Fair Value of Financial Instruments - Other Investments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Other Equity Method Investments
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity contributions			$ 0.2	$ 0.2
Subcontracting Arrangements | Related Party
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Operating costs and expenses	$ 1.2	$ 0.7	2.4	1.5
Accounts payable	0.2		0.2		$ 0.1
Accounts receivable, after allowance for credit loss	0.4		0.4		0.4
Advanced Receivable Arrangement
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Operating costs and expenses			0.1	$ 0.4
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		$ 4.2		$ 4.0