Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Other Intangible Assets (Details)

v3.10.0.1
Summary of Significant Accounting Policies - Other Intangible Assets (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2017
Jun. 30, 2018
Dec. 31, 2017
Indefinite-lived Intangible Assets [Line Items]      
Discount rates   25.00%  
Customer attrition rates   20.00%  
Intangible asset impairment charges $ 1.1    
Minimum      
Indefinite-lived Intangible Assets [Line Items]      
Discount rates     17.00%
Customer attrition rates     15.00%
Maximum      
Indefinite-lived Intangible Assets [Line Items]      
Discount rates     25.00%
Customer attrition rates     78.00%