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SUBSEQUENT EVENTS (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2020
USD ($)
state
Oct. 31, 2020
USD ($)
vote
$ / shares
shares
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
state
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Subsequent Event [Line Items]            
Common stock, shares authorized (in shares)         269,000,000.0 266,000,000.0
Shares authorized (in shares)         170,000,000.0 167,400,000
Par value (in dollars per share) | $ / shares         $ 0.0001 $ 0.0001
Common stock, par value (in dollars per share) | $ / shares         $ 0.0001 $ 0.0001
Stock issuance costs | $     $ 0.1 $ 0.1    
Number of states auto policies written | state         30  
Subsequent event            
Subsequent Event [Line Items]            
Shares authorized (in shares)   100,000,000.0        
Par value (in dollars per share) | $ / shares   $ 0.0001        
Common stock, par value (in dollars per share) | $ / shares   $ 0.0001        
Proceeds from sale of stock | $   $ 1,100.0        
Stock issuance costs | $   $ 53.4        
Number of warrants exercised (in shares)   2,800,000        
Interest expense recognized | $   $ 38.7        
Number of states auto policies written | state 48          
Subsequent event | Shell insurance company            
Subsequent Event [Line Items]            
Purchase price | $ $ 22.8          
Cash, cash equivalents and investment income acquired | $ 14.4          
Indefinite-lived asset acquired | $ $ 8.4          
Subsequent event | 2020 Equity Incentive Plan            
Subsequent Event [Line Items]            
Shares authorized (in shares)   41,200,000        
Annual shares increase, percentage of outstanding stock   4.00%        
Subsequent event | 2020 ESPP            
Subsequent Event [Line Items]            
Shares authorized (in shares)   5,000,000.0        
Annual shares increase, percentage of outstanding stock   1.00%        
Subsequent event | IPO | Common stock            
Subsequent Event [Line Items]            
Stock sold in transaction (in shares)   24,200,000        
Price of stock sold (in dollars per share) | $ / shares   $ 27.00        
Class A Common Stock | Subsequent event            
Subsequent Event [Line Items]            
Common stock, shares authorized (in shares)   1,000,000,000.0        
Votes per share | vote   1        
Class A Common Stock | Subsequent event | 2020 Equity Incentive Plan            
Subsequent Event [Line Items]            
Maximum shares allowed to be issued (in shares)   120,000,000.0        
Class A Common Stock | Subsequent event | 2020 ESPP            
Subsequent Event [Line Items]            
Shares outstanding, annual shares increase (in shares)   7,500,000        
Class A Common Stock | Subsequent event | Private placement            
Subsequent Event [Line Items]            
Stock sold in transaction (in shares)   18,500,000        
Class B Common Stock | Subsequent event            
Subsequent Event [Line Items]            
Common stock, shares authorized (in shares)   269,000,000.0        
Votes per share | vote   10