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Long-Term Debt and Short-Term Borrowings - Revolving Credit Facility Narrative (Details) € in Millions |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 05, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 EUR (€) | Jan. 01, 2022 | Dec. 31, 2021 USD ($) | Dec. 31, 2021 EUR (€) | May 21, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt agreement term |  | 10 years |  |  |  |  |
Letters of credit outstanding amount |  | $ 206,800,000 |  |  |  |  |
Revolving credit facility, with interest ranging from 5.03% to 5.23% |  | $ 178,000,000 |  |  | $ 0 |  |
2021 Credit Agreement |  |  |  |  |  |  |
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 Facility, Maturity Date August 5, 2027 | 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 facility | Turner & Townsend |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Revolving credit facility, with interest ranging from 5.03% to 5.23% |  |  |  |  | $ 27,000,000 | € 20.0 |
Revolving credit facility | 2021 Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt agreement term | 5 years |  |  |  |  |  |
Amounts available to borrow under credit agreement |  |  |  |  |  |  | $ 3,150,000,000
Credit spread adjustment rate |  |  |  | 0.0326% |  |  |
Revolving credit facility | 2021 Credit Agreement | Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit Agreement applicable fixed rate spread |  | 0.68% |  |  |  |  |
Credit Agreement applicable daily rate spread |  | 0.00% |  |  |  |  |
Revolving credit facility | 2021 Credit Agreement | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit Agreement applicable fixed rate spread |  | 1.075% |  |  |  |  |
Credit Agreement applicable daily rate spread |  | 0.075% |  |  |  |  |
Revolving credit facility | 2021 Credit Agreement | Canadian, Australian and New Zealand subsidiaries |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amounts available to borrow under credit agreement |  | $ 200,000,000 |  |  |  |  |
Revolving credit facility | 2021 Credit Agreement | U.K. subsidiaries |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amounts available to borrow under credit agreement |  | 320,000,000 |  |  |  |  |
Revolving credit facility | Revolving Credit Facility, Maturity Date August 5, 2027 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt agreement term | 5 years |  |  |  |  |  |
Amounts available to borrow under credit agreement | $ 3,500,000,000 |  |  |  |  |  |
Interest rate | 1000.00% |  |  |  |  |  |
Revolving credit facility | Revolving Credit Facility, Maturity Date August 5, 2027 | Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Letters of credit outstanding amount | $ 300,000,000 |  |  |  |  |  |
Revolving credit facility | Revolving Credit Facility, Maturity Date August 5, 2027 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (percent) | 1.00% |  |  |  |  |  |
Revolving credit facility | Revolving Credit Facility, Maturity Date August 5, 2027 | Minimum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (percent) | 0.63% |  |  |  |  |  |
Revolving credit facility | Revolving Credit Facility, Maturity Date August 5, 2027 | Minimum | Base Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (percent) | 0.00% |  |  |  |  |  |
Revolving credit facility | Revolving Credit Facility, Maturity Date August 5, 2027 | Maximum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (percent) | 1.10% |  |  |  |  |  |
Revolving credit facility | Revolving Credit Facility, Maturity Date August 5, 2027 | Maximum | Base Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (percent) | 0.10% |  |  |  |  |  |
Revolving credit facility | 2019 Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Initial borrowing | $ 220,000,000 |  |  |  |  |  |
Line of credit facility outstanding |  | 178,000,000 |  |  |  |  |
Revolving credit facility | 2019 Credit Agreement | Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Letters of credit outstanding amount | $ 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 | € |  |  | € 120.0 |  |  |  |
Increase limit | € |  |  | 20.0 |  |  |  |
Revolving credit facility, with interest ranging from 5.03% to 5.23% |  | $ 31,900,000 | 26.3 |  |  |  |
Revolving credit facility | Revolving Credit Facility, Maturity Date November 11, 2022 | Turner & Townsend | SONIA Overnight Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  | 0.75% |  |  |  |  |
Revolving credit facility | Revolving Credit Facility, Maturity Date November 11, 2022 | Minimum | Turner & Townsend | SONIA Overnight Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  | 1.0266% |  |  |  |  |
Revolving credit facility | Revolving Credit Facility, Maturity Date November 11, 2022 | Maximum | Turner & Townsend | SONIA Overnight Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate (percent) |  | 2.0266% |  |  |  |  |
Revolving credit facility | Revolving Credit Facility, Maturity Date May 5 2022 | Turner & Townsend |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amounts available to borrow under credit agreement | € |  |  | € 80.0 |  |  |  |

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- Definition Line of Credit Facility, Accordion Feature, Increase Limit + References No definition available. + Details
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- Definition Long term debt percentage spread over daily interest rate. + References No definition available. + Details
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- Definition Long term debt percentage spread over fixed interest rate. + References No definition available. + Details
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- Definition Maximum leverage ratio during first four quarter that qualified acquisition is consummated. + References No definition available. + Details
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- Definition This element represents the maximum ratio of debt less available cash to earnings before interest, taxes, depreciation and amortization (EBITDA) allowed in the reporting entity's credit agreement. + References No definition available. + Details
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- Definition This element represents the minimum ratio of earnings before interest, taxes, depreciation and amortization (EBITDA) to total interest expense required in the reporting entity's credit agreement. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 + Details
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- Definition The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585 + Details
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