Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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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]          
Income (loss) before income taxes $ 12.3 $ 9.0 $ 1.9 $ (0.9)  
Income tax expense $ 1.8 $ 3.6 $ 1.8 $ 1.5  
Effective tax rate 14.60% 40.00% 94.70% (166.70%)  
U.S. federal corporate tax rate     21.00%   35.00%
Percentage of net operating losses limited upon Tax Reform enactment 80.00%   80.00%