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Description of the Business and Summary of Significant Accounting Policies - Internal Use Software (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Capitalized internal use software costs $ 0.0 $ 0.0 $ 0.0