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Summary of Significant Accounting Policies - Adoption of Accounting Standards Codification Topic 842 Leases (Details) - ASU 2016-02
$ in Millions
Jan. 01, 2019
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Operating Lease right-of-use assets $ 9.6
Operating lease liabilities $ 10.0