Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (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 Taxes [Abstract]          
Effective tax rate 33.00% 43.00% 33.00% 43.00%  
Corporate tax rate     21.00%   35.00%
Tax Cuts and Jobs Act of 2017, Provisoinal income tax benefit         $ 45.3
Reduction in provisional tax benefit recognized $ 2.7   $ 2.7