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Description of the Business and Summary of Significant Accounting Policies - Foreign Currency Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Net foreign currency transaction gain (loss) $ (1.9) $ 5.0 $ (3.6)