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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]          
Effective tax rate 22.20% 14.90% 11.40% 15.20%  
Federal statutory rate 21.00% 35.00% 21.00% 35.00% 35.00%
Transition tax         $ 5.0
Income tax expense (benefit)     $ 0.8   $ 5.0
Measurement period adjustment     $ 0.8    
Measurement period adjustment, effective tax rate     (7.00%)