Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Details)

v3.10.0.1
Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Income Tax Contingency [Line Items]          
Effective income tax rates 11.20% (21.30%) (3.20%) (15.30%)  
Unrecognized tax benefits $ 0.6   $ 0.6   $ 1.5
Unrecognized tax benefits income tax penalties and interest accrued $ 0.2   0.2   0.4
Unrecognized tax benefits, reduction resulting from lapse of applicable statute of limitations     $ 1.1    
State          
Income Tax Contingency [Line Items]          
Net operating loss carryforwards         630.7
Net operating loss carryforwards, Year of expiration     2024    
Federal          
Income Tax Contingency [Line Items]          
Net operating loss carryforwards         $ 720.1
Net operating loss carryforwards, Year of expiration     2028