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Long-Term Debt and Short-Term Borrowings - Narrative (Details) £ in Millions |  |  |  |  |  |  | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 23, 2024 USD ($) | Jul. 10, 2023 USD ($) | Jun. 23, 2023 USD ($) | Aug. 05, 2022 USD ($) | Mar. 18, 2021 USD ($) | Aug. 13, 2015 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2024 EUR (€) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 GBP (£) | Jul. 10, 2023 EUR (€) | Mar. 31, 2022 EUR (€)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt |  |  |  |  |  |  | $ 3,325,000,000 |  | $ 2,824,000,000 |  |  |
Letters of credit outstanding amount |  |  |  |  |  |  | 269,000,000 |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  | 683,000,000 |  | 0 |  |  |
2023 Credit Agreement with Wells Fargo |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 0.10% |  |  |  |  |  |  |  |  | 0.10% |
Minimum coverage ratio of EBITDA to total interest expense expressed in percentage |  | 2.00% |  |  |  |  |  |  |  |  |  |
Maximum leverage ratio of total debt less available cash to EBITDA expressed in percentage |  | 4.25% |  |  |  |  |  |  |  |  |  |
Maximum leverage ratio during first four quarter that qualified acquisition is consummated |  | 4.75% |  |  |  |  |  |  |  |  |  |
2023 Credit Agreement with Wells Fargo | Euro Term Loan Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt |  |  |  |  |  |  | 408,000,000 |  |  |  |  |
2023 Credit Agreement with Wells Fargo | U.S. Dollar Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt |  |  |  |  |  |  | $ 348,000,000 |  |  |  |  |
2023 Credit Agreement with Wells Fargo | Secured Overnight Financing Rate (SOFR) Overnight Index Swap |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable rate (as a percent) |  | 1.00% |  |  |  |  |  |  |  |  |  |
2023 Credit Agreement with Wells Fargo | Secured Overnight Financing Rate (SOFR) Overnight Index Swap | U.S. Dollar Term Loan | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 1.25% | 1.25% |  |  |  |
2023 Credit Agreement with Wells Fargo | Europe Interbank Offered Rate (EURIBOR) | Euro Term Loan Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 1.25% | 1.25% |  |  |  |
2023 Credit Agreement with Wells Fargo | Fed Funds Effective Rate Overnight Index Swap Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable rate (as a percent) |  | 0.50% |  |  |  |  |  |  |  |  |  |
2023 Credit Agreement with Wells Fargo | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt agreement term |  | 5 years |  |  |  |  |  |  |  |  |  |
2023 Credit Agreement with Wells Fargo, Tranche A Euro Denominated Term Loan | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | € |  |  |  |  |  |  |  |  |  |  | € 367,000,000 |
2023 Credit Agreement with Wells Fargo, Tranche A, US Dollar Denominated Term Loan | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |
Revolving Credit Agreement | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Minimum coverage ratio of EBITDA to total interest expense expressed in percentage |  |  |  | 2.00% |  |  |  |  |  |  |  |
Maximum leverage ratio of total debt less available cash to EBITDA expressed in percentage |  |  |  | 4.25% |  |  |  |  |  |  |  |
Maximum leverage ratio during first four quarter that qualified acquisition is consummated |  |  |  | 4.75% |  |  |  |  |  |  |  |
Revolving Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt agreement term |  |  |  | 5 years |  |  |  |  |  |  |  |
Interest rate |  |  |  | 0.10% |  |  |  |  |  |  |  |
Amounts available to borrow under credit agreement |  |  |  | $ 3,500,000,000 |  |  |  |  |  |  |  |
Revolving Credit Agreement | Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding amount |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |
Revolving Credit Agreement | Secured Overnight Financing Rate (SOFR) Overnight Index Swap | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable rate (as a percent) |  |  |  | 1.00% |  |  |  |  |  |  |  |
Revolving Credit Agreement | Secured Overnight Financing Rate (SOFR) Overnight Index Swap | Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable rate (as a percent) |  |  |  | 0.63% |  |  |  |  |  |  |  |
Revolving Credit Agreement | Secured Overnight Financing Rate (SOFR) Overnight Index Swap | Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable rate (as a percent) |  |  |  | 1.10% |  |  |  |  |  |  |  |
Revolving Credit Agreement | Base Rate | Revolving Credit Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable rate (as a percent) |  |  |  | 0.00% |  |  |  |  |  |  |  |
Revolving Credit Agreement | Base Rate | Revolving Credit Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable rate (as a percent) |  |  |  | 0.10% |  |  |  |  |  |  |  |
Revolving Credit Agreement | Fed Funds Effective Rate Overnight Index Swap Rate | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable rate (as a percent) |  |  |  | 0.50% |  |  |  |  |  |  |  |
5.950% senior notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 5.95% | 5.95% |  |  |  |
Percentage of face value |  |  | 98.174% |  |  |  |  |  |  |  |  |
5.950% senior notes | Senior Notes | On Or After January 1, 2031 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  | 100.00% |  |  |  |  |  |  |  |  |
5.950% senior notes | Senior Notes | US Treasury (UST) Interest Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Semi-annual basis adjustment (basis points) |  |  |  |  |  |  | 0.40% |  |  |  |  |
5.500% senior notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 5.50% | 5.50% |  |  |  |
Total long-term debt |  |  |  |  |  |  | $ 496,000,000 |  | 0 |  |  |
Percentage of face value | 99.837% |  |  |  |  |  |  |  |  |  |  |
5.500% senior notes | Senior Notes | On Or After January 1, 2031 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage | 100.00% |  |  |  |  |  |  |  |  |  |  |
5.500% senior notes | Senior Notes | US Treasury (UST) Interest Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Semi-annual basis adjustment (basis points) |  |  |  |  |  |  | 0.20% |  |  |  |  |
2.500% senior notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 2.50% | 2.50% |  |  |  |
Total long-term debt |  |  |  |  |  |  | $ 495,000,000 |  | 494,000,000 |  |  |
Percentage of face value |  |  |  |  | 98.451% |  |  |  |  |  |  |
4.875% senior notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 600,000,000 |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 4.875% | 4.875% |  |  |  |
Total long-term debt |  |  |  |  |  |  | $ 599,000,000 |  | 599,000,000 |  |  |
Redemption price percentage |  |  |  |  |  | 99.24% |  |  |  |  |  |
2019 Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  | 683,000,000 |  | 0 |  |  |
2019 Credit Agreement | Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding amount |  |  |  |  |  |  | 10,000,000 |  |  |  |  |
2027 Credit Agreement | Revolving Credit Facility | Turner & Townsend |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amounts available to borrow under credit agreement | € |  |  |  |  |  |  |  |  |  |  |  | € 120,000,000
Revolving credit facility |  |  |  |  |  |  | $ 0 |  |  |  |  |
Additional accordion option | € |  |  |  |  |  |  |  | € 20,000,000 |  |  |  |
Two Point Five Percent Senior Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to treasury rate |  |  |  |  | 0.20% |  |  |  |  |  |  |
Two Point Five Percent Senior Notes | Senior Notes | On Or After January 1, 2031 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |
Four Point Eight Seven Five Senior Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of long term debt available for redemption |  |  |  |  |  | 100.00% |  |  |  |  |  |
Redemption price percentage, following change in control |  |  |  |  |  | 101.00% |  |  |  |  |  |
Revolving Credit Facility, Maturity Date January 31, 2024 | Revolving Credit Facility | Turner & Townsend |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  | $ 10,000,000 | £ 8.0 |  |

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