Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - (Details)

v3.10.0.1
Income Taxes - (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Taxes          
Accrual of state income taxes, net of federal tax benefit $ 0.6 $ 0.2   $ 0.2  
Effective tax rate (as a percent)   (7.60%) 32.00% 54.20% 32.00%
U.S. statutory tax rate (as a percent) 34.00%     21.00%  
Tax benefit, separation expenses   $ 0.4      
Effective tax rate benefit, separation expenses   18.00%      
Effective tax rate, ordinary income (as a percent)   24.10%   24.10%