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Long-Term Debt and Short-Term Borrowings - Short Term Borrowings - Narrative (Detail) € in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2022 EUR (€) | Jun. 30, 2022 USD ($) | Jun. 30, 2022 EUR (€) | Mar. 30, 2022 EUR (€) | Jan. 01, 2022 | Dec. 31, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Revolving credit facility |  | $ 310,000,000 |  |  |  | $ 0
Letters of credit outstanding amount |  | 176,300,000 |  |  |  |
2021 Credit Agreement | Revolving credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amounts available to borrow under credit agreement |  | 3,150,000,000 |  |  |  |
Credit spread adjustment rate |  |  |  |  | 0.0326% |
Revolving credit facility |  | 310,000,000 |  |  |  |
Letters of credit outstanding amount |  | $ 2,000,000 |  |  |  |
2021 Credit Agreement | Revolving credit facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit over LIBOR rate |  | 0.90% |  |  |  |
2021 Credit Agreement | Revolving credit facility | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit Agreement applicable fixed rate spread |  | 0.68% |  |  |  |
Credit Agreement applicable daily rate spread |  | 0.00% |  |  |  |
2021 Credit Agreement | Revolving credit facility | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit Agreement applicable fixed rate spread |  | 1.075% |  |  |  |
Credit Agreement applicable daily rate spread |  | 0.075% |  |  |  |
2021 Credit Agreement | Canadian, Australian and New Zealand subsidiaries | Revolving credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amounts available to borrow under credit agreement |  | $ 200,000,000 |  |  |  |
2021 Credit Agreement | U.K. subsidiaries | Revolving credit facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amounts available to borrow under credit agreement |  | 320,000,000 |  |  |  |
2022 Credit Agreement | Revolving credit facility | Turner & Townsend Holdings Limited |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amounts available to borrow under credit agreement | € |  |  |  | € 80.0 |  |
2027 Credit Agreement | Revolving credit facility | Turner & Townsend Holdings Limited |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amounts available to borrow under credit agreement | € | € 120.0 |  |  |  |  |
Revolving credit facility |  | $ 24,400,000 | € 20.0 |  |  |
Additional accordion option | € | € 20.0 |  |  |  |  |
2027 Credit Agreement | Revolving credit facility | Turner & Townsend Holdings Limited | SONIA |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit over LIBOR rate | 0.75% |  |  |  |  |
2027 Credit Agreement | Revolving credit facility | Minimum | Turner & Townsend Holdings Limited | SONIA |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit over LIBOR rate |  | 0.75% |  |  |  |
2027 Credit Agreement | Revolving credit facility | Maximum | Turner & Townsend Holdings Limited | SONIA |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit over LIBOR rate |  | 1.75% |  |  |  |

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