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Long-Term Debt and Short-Term Borrowings - Revolving Credit Facility Narrative (Details) € in Millions |  | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 05, 2022 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2023 EUR (€) | Dec. 31, 2022 USD ($) | Mar. 31, 2022 EUR (€) | Jan. 01, 2022 | May 21, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Revolving credit facility |  | $ 1,209,000,000 |  | $ 178,000,000 |  |  |
Revolving credit facility | 2021 Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amounts available to borrow under credit agreement |  |  |  |  |  |  | $ 3,150,000,000
Credit spread adjustment rate |  |  |  |  |  | 0.0326% |
Debt agreement term | 5 years |  |  |  |  |  |
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 Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amounts available to borrow under credit agreement | $ 3,500,000,000 |  |  |  |  |  |
Debt agreement term | 5 years |  |  |  |  |  |
Revolving credit facility | Revolving Credit Agreement | Fed Funds Effective Rate Overnight Index Swap Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.50% |  |  |  |  |  |
Revolving credit facility | 2027 Credit Agreement | Turner & Townsend |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amounts available to borrow under credit agreement | € |  |  | € 120.0 |  |  |  |
Additional accordion option | € |  |  |  |  | € 20.0 |  |
Revolving credit facility |  | $ 8,600,000 | € 7.0 |  |  |  |
Revolving credit facility | Revolving Credit Facility, Maturity Date November 11, 2022 | Turner & Townsend | SONIA |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.75% |  |  |  |  |

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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 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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