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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