Quarterly report pursuant to Section 13 or 15(d)

Property, Equipment and Software - Additional Information (Details)

v3.19.2
Property, Equipment and Software - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Property, Plant and Equipment [Line Items]          
Depreciation and amortization expense for property, equipment and software $ 7.7 $ 7.5 $ 15.2 $ 14.4  
Carrying amount of capitalized software development costs 60.4   60.4   $ 54.9
Software          
Property, Plant and Equipment [Line Items]          
Depreciation and amortization expense for property, equipment and software $ 3.8 $ 3.0 $ 7.0 $ 5.5