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Income Taxes (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Federal Statutory Income Tax Rate, Percent 21.00% 35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   $ 70.4