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Long-Term Debt and Short-Term Borrowings - Turner & Townsend Revolving Credit Facility Narrative (Details) £ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2024 GBP (£)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 GBP (£)
Debt Instrument [Line Items]
Revolving credit facility, with interest of 7.50% | $	$ 132		$ 0
Revolving credit facility | Revolving Credit Facility, Maturity Date March 31, 2027 | Turner & Townsend
Debt Instrument [Line Items]
Amounts available to borrow under credit agreement		£ 120
Increase limit		20
Revolving credit facility | Revolving Credit Facility, Maturity Date January 31, 2024 | Turner & Townsend
Debt Instrument [Line Items]
Revolving credit facility, with interest of 7.50%	$ 44	£ 35	$ 10	£ 8
Basis spread on variable rate (percent)	0.78%

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