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Long-Term Debt and Short-Term Borrowings - Revolving Credit Facility Narrative (Details) £ in Millions, $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 10, 2023 | Aug. 05, 2022 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 GBP (£) | Dec. 31, 2022 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Debt agreement term |  |  | 11 years |  |
Letters of credit outstanding amount |  |  | $ 236.9 |  |
Revolving credit facility, with interest ranging from 5.03% to 5.23% |  |  | 0.0 |  | $ 178.0
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% |  |  |
2023 Credit Agreement with Wells Fargo |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate | 1000.00% |  |  |  |
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 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) | 100.00% |  |  |  |
2023 Credit Agreement with Wells Fargo | Fed Funds Effective Rate Overnight Index Swap Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) |  | 500.00% |  |  |
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 |  | $ 3,500.0 |  |  |
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 |  | $ 300.0 |  |  |
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 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) |  | 0.63% |  |  |
Revolving credit facility | Revolving Credit Facility, Maturity Date August 5, 2027 | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) |  | 1.10% |  |  |
Revolving credit facility | Revolving Credit Facility, Maturity Date August 5, 2027 | Base Rate | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) |  | 0.00% |  |  |
Revolving credit facility | Revolving Credit Facility, Maturity Date August 5, 2027 | Base Rate | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) |  | 0.10% |  |  |
Revolving credit facility | Revolving Credit Facility, Maturity Date August 5, 2027 | Fed Funds Effective Rate Overnight Index Swap Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) | 500.00% |  |  |  |
Revolving credit facility | 2019 Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of credit facility outstanding |  |  | 0.0 |  |
Revolving credit facility | 2019 Credit Agreement | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letters of credit outstanding amount |  |  | 0.0 |  |
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 | Revolving Credit Facility, Maturity Date January 31, 2024 | Turner & Townsend |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Revolving credit facility, with interest ranging from 5.03% to 5.23% |  |  | $ 10.2 | £ 8.0 |
Revolving credit facility | Revolving Credit Facility, Maturity Date January 31, 2024 | SONIA Overnight Rate | Turner & Townsend |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate (percent) |  |  | 0.75% |  |

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