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Significant Accounting Policies - Accrued Receivable and Accrued Claims Payable (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
Accrued receivables $ 17.3 $ 9.5
Accrued claims payable 11.6 6.7
Unbilled receivables $ 9.2 $ 3.6