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 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]          
Income (loss) before income taxes $ 9.3 $ (31.0) $ 11.2 $ (31.9)  
Income tax expense (benefit) $ 1.4 $ (12.3) $ 3.2 $ (10.8)  
Effective tax rate 15.10% 39.70% 28.60% 33.90%  
U.S. federal corporate tax rate     21.00%   35.00%
Percentage of net operating losses limited upon Tax Reform enactment 80.00%   80.00%    
Tax Cuts And Jobs Act Of 2017, provisional tax expense     $ 0.1