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Long-Term Debt and Short-Term Borrowings - Turner & Townsend Revolving Credit Facility Narrative (Details) £ in Millions, $ in Millions	Mar. 31, 2025 USD ($)	Mar. 31, 2025 GBP (£)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 GBP (£)	Mar. 31, 2022 GBP (£)
Debt Instrument [Line Items]
Revolving credit facility | $	$ 0		$ 132
Revolving credit facility | 2027 Credit Agreement | Turner & Townsend
Debt Instrument [Line Items]
Amounts available to borrow under credit agreement					£ 120
Additional accordion option		£ 20
Revolving credit facility | Revolving Credit Facility, Maturity Date January 31, 2024 | Turner & Townsend
Debt Instrument [Line Items]
Revolving credit facility	$ 0		$ 44	£ 35

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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