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Fair Value of Financial Instruments - Other Investments - Other Equity Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity method investments, net investment	$ 330.0	$ 319.0
Subcontracting Arrangements \| Related Party
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Receivables, related party	0.4	0.4
FM Tech
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity method investments, net investment	17.0	18.0
FM Tech \| Equity Method Investments
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Financing commitments	3.0	3.0
FM Tech \| Maximum \| Equity Method Investments
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Financing commitments	7.0
Other Equity Method Investments
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity method investments, equity contributions	0.4	0.2	$ 1.3
Equity method investments, distributions of earnings received, operating cash flows	1.9	0.0	0.0
Telecommunications Equity Method Investees \| Subcontracting Arrangements \| Related Party
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Payments, related party	5.4	2.7	14.2
Payables, related party	0.3	0.1
Telecommunications Equity Method Investees \| Advanced Receivable Arrangement
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Payments, related party	0.1	0.7	$ 3.3
Telecommunications Equity Method Investees \| Employee Leasing and Advanced Receivable Arrangement \| Related Party
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Receivables, related party	$ 4.1	$ 4.0