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Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Schedule of Effective Income Tax Rate Reconciliation [Abstract]    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00% 35.00%
Effective Income Tax Rate Reconciliation, Percent 13.50% 48.70%
Unrecognized Tax Benefits, Income Tax Penalties Expense $ (0.5) $ (0.4)
Income tax settlement amount with taxing authority 7.4  
Income Tax Examination, Interest Accrued $ 4.1  
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent (12.70%) 6.20%
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent (0.90%) (0.10%)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent 0.60% 7.50%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent (0.40%) (0.50%)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent (8.70%) 0.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 0.60% 0.60%
Tax Cuts and Jobs Act Federal Tax Rate 21.00%