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Summary of Significant Accounting Policies - Recently Issued Accounting Standards (Details) - Forecast
$ in Millions
Jan. 01, 2019
USD ($)
Minimum  
Lessee, Lease, Description [Line Items]  
Right-of-use asset $ 8.0
Finance lease, liability 8.0
Maximum  
Lessee, Lease, Description [Line Items]  
Right-of-use asset 9.0
Finance lease, liability $ 9.0