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Retirement Benefit Plan - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |
Shares fully vested, Description |  |  | Shares allocated to a participant’s account are fully vested after three years of credited service, or in the event(s) of reaching age 65, death or disability while an active employee of the Company. |  |
Shares fully vested after credited service |  |  | 3 years |  |
Common stock shares outstanding including ESOP | 104,888,473 |  | 104,888,473 |  | 104,702,996
Company's stock held by ESOP | 59,752,326 |  | 59,752,326 |  | 63,742,151
Direct Costs of Contracts and Selling, General and Administrative Expense |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |
ESOP contribution expense | $ 14.9 | $ 15.4 | $ 44.1 | $ 42.0 |

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