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Income Taxes (Details 4) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Document Period End Date Dec. 31, 2019  
Unrecognized tax benefits    
Balance as of beginning of period $ 19.6 $ 12.3
Increase in tax positions of prior years 0.5 7.6
Decrease in tax positions of prior years (0.5) (1.0)
Increase in tax positions of current year 13.2 0.7
Balance as of December 31 $ 32.8 $ 19.6