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Retirement Benefit Plan - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
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 | 103,730,134 |  | 103,659,731
Company's stock held by ESOP | 68,787,554 |  | 70,328,237
Direct Costs of Contracts and Selling, General and Administrative Expense |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |
ESOP contribution expense | $ 13.1 | $ 13.2 |

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- Definition The amount of plan compensation cost recognized during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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