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Significant Accounting Policies - Accrued Receivable and Accrued Claims Payable (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Accounting Policies [Abstract]    
Accrued receivables $ 65.6 $ 45.8
Accrued claims payable $ 40.3 30.3
Claims payable, payment period (within) 30 days  
Unbilled receivables $ 59.5 $ 45.1
Period in which unbilled receivables are billed to clients (within) 30 days