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Basis of Presentation and Summary of Significant Accounting Policies - Research and Development (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]      
Capitalized software, net of amortization $ 6.2 $ 8.3  
Capitalized software amortization expense 2.4 2.4 $ 1.2
Research and development expense $ 22.9 $ 23.3 $ 29.1