XML 38 R27.htm IDEA: XBRL DOCUMENT v3.21.2
Significant Accounting Policies - Accrued Receivable and Accrued Claims Payable (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Accounting Policies [Abstract]    
Accrued receivables $ 34.2 $ 28.2
Accrued claims payable 26.3 22.8
Unbilled receivables $ 24.8 $ 16.4