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Consolidated Statements of Operations - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]      
Revenue $ 6,421.0 $ 3,720.8 $ 2,386.0
Operating expenses:      
Commissions and other related expense 5,310.5 3,056.9 1,935.6
Sales and marketing 510.4 407.9 382.8
Operations and support 374.9 225.1 204.8
Research and development 365.3 146.3 131.3
General and administrative 288.5 106.7 92.4
Depreciation and amortization 64.4 51.2 40.9
Total operating expenses 6,914.0 3,994.1 2,787.8
Loss from operations (493.0) (273.3) (401.8)
Investment income, net 0.1 2.0 12.9
Interest expense (2.4) (0.6)  
Loss before income taxes and equity in loss (495.3) (271.9) (388.9)
Benefit from income taxes 2.5 1.7 0.9
Equity in loss of unconsolidated entity (1.3)    
Net loss $ (494.1) $ (270.2) $ (388.0)
Net loss per share attributable to common stockholders, basic and diluted $ (1.51) $ (2.46) $ (3.64)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted 326,336,128 109,954,760 106,529,880