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Restructuring Charges (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]      
Pre-tax restructuring charges [1] $ 43.6 $ 0.0 $ 0.0
Outbound Sales and Operations Restructuring      
Restructuring Cost and Reserve [Line Items]      
Pre-tax restructuring charges 43.6    
Severance and related benefits 14.6    
Impairment of operating lease assets 27.9    
Accelerated depreciation and amortization 1.1    
Cash payments related to restructuring $ 14.4    
[1]
(1) Costs and operating expenses include equity-based compensation expense as follows:
Cost of revenue$0.7 $0.4 $— 
Technology and development$90.2 $70.3 $57.8 
Marketing and advertising$21.7 $15.4 $10.3 
Customer care$12.0 $9.3 $6.2 
General and administrative$66.9 $51.6 $51.2 
Total equity-based compensation expense$191.5 $147.0 $125.5