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Fixed Assets, Net - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Property, Plant and Equipment    
Depreciation expense $ 4.3 $ 4.9
Adjustments to impairment 0.0 (0.3)
Software, including software development costs    
Property, Plant and Equipment    
Software development costs capitalized 0.6 1.3
Amortization of software development costs $ 0.3 $ 0.3