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Ordinary Shares (Details)
$ / shares in Units, ¥ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Apr. 30, 2020
CNY (¥)
shares
Apr. 30, 2020
USD ($)
shares
Apr. 30, 2019
CNY (¥)
Apr. 30, 2019
USD ($)
Oct. 31, 2018
CNY (¥)
shares
Oct. 31, 2018
USD ($)
shares
Apr. 30, 2018
CNY (¥)
shares
Apr. 30, 2018
USD ($)
$ / shares
shares
Dec. 31, 2020
$ / shares
Dec. 31, 2019
$ / shares
Dec. 31, 2018
$ / shares
Class Y Ordinary Shares                      
Ordinary shares                      
Ordinary shares, par value (in dollars per share) | $ / shares                 $ 0.0001 $ 0.0001 $ 0.0001
Number of shares redesignated to ordinary shares, group one             60,027,926 60,027,926      
Number of shares redesignated to ordinary shares, group two             13,600,000 13,600,000      
Number of shares redesignated to ordinary shares, group three             8,500,000 8,500,000      
Number of shares redesignated to ordinary shares, group four             2,132,353 2,132,353      
Number of shares redesignated to ordinary shares, group six             1,104,535 1,104,535      
Class Z Ordinary Shares                      
Ordinary shares                      
Ordinary shares, par value (in dollars per share) | $ / shares                 $ 0.0001 $ 0.0001 $ 0.0001
Ordinary shares, issued (in shares) 17,310,696 17,310,696     25,063,451 25,063,451 42,000,000 42,000,000      
Number of shares redesignated to ordinary shares, group five             9,309,000 9,309,000      
Number of shares redesignated to ordinary shares, group seven             7,078,502 7,078,502      
Number of shares redesignated to ordinary shares, group eight             14,643,281 14,643,281      
Number of shares redesignated to ordinary shares, group nine             22,794,876 22,794,876      
Number of shares redesignated to ordinary shares, group ten             27,996,184 27,996,184      
Number of shares redesignated to ordinary shares, group eleven             41,480,769 41,480,769      
Number of shares redesignated to ordinary shares, group twelve             954,605 954,605      
Number of shares redesignated to ordinary shares, group thirteen             13,101,189 13,101,189      
Number of shares redesignated to ordinary shares, group fourteen             13,759,564 13,759,564      
Pre-IPO Series A Preferred Shares                      
Ordinary shares                      
Number of shares redesignated to ordinary shares, group seven             7,078,502 7,078,502      
Pre-IPO Class A Ordinary Shares                      
Ordinary shares                      
Redesignation conversion ratio             1 1      
Number of shares redesignated to ordinary shares, group one             60,027,926 60,027,926      
Number of shares redesignated to ordinary shares, group five             9,309,000 9,309,000      
Pre-IPO Class B Ordinary Shares                      
Ordinary shares                      
Stock conversion ratio, into Class A ordinary shares                 1    
Redesignation conversion ratio             1 1      
Number of shares redesignated to ordinary shares, group two             13,600,000 13,600,000      
Pre-IPO Class C Ordinary Shares                      
Ordinary shares                      
Stock conversion ratio, into Class A ordinary shares                 1    
Redesignation conversion ratio             1 1      
Number of shares redesignated to ordinary shares, group three             8,500,000 8,500,000      
Pre-IPO Class D Ordinary Shares                      
Ordinary shares                      
Stock conversion ratio, into Class A ordinary shares                 1    
Redesignation conversion ratio             1 1      
Number of shares redesignated to ordinary shares, group four             2,132,353 2,132,353      
Pre-IPO Series A+ Preferred Shares                      
Ordinary shares                      
Number of shares redesignated to ordinary shares, group eight             14,643,281 14,643,281      
Pre-IPO Series B Preferred Shares                      
Ordinary shares                      
Redesignation conversion ratio             1 1      
Number of shares redesignated to ordinary shares, group nine             22,794,876 22,794,876      
Pre-IPO Series C Preferred Shares                      
Ordinary shares                      
Redesignation conversion ratio             1 1      
Number of shares redesignated to ordinary shares, group ten             27,996,184 27,996,184      
Pre-IPO Series C1 Preferred Shares                      
Ordinary shares                      
Redesignation conversion ratio             1 1      
Number of shares redesignated to ordinary shares, group six             1,104,535 1,104,535      
Number of shares redesignated to ordinary shares, group eleven             41,480,769 41,480,769      
Pre-IPO Series C2 Preferred Shares                      
Ordinary shares                      
Redesignation conversion ratio             1 1      
Number of shares redesignated to ordinary shares, group twelve             954,605 954,605      
Pre-IPO Series D1 Preferred Shares                      
Ordinary shares                      
Redesignation conversion ratio             1 1      
Number of shares redesignated to ordinary shares, group thirteen             13,101,189 13,101,189      
Pre-IPO Series D2 Preferred Shares                      
Ordinary shares                      
Redesignation conversion ratio             1 1      
Number of shares redesignated to ordinary shares, group fourteen             13,759,564 13,759,564      
ADSs                      
Ordinary shares                      
Ordinary shares, issued (in shares) 17,310,696 17,310,696     25,063,451 25,063,451          
American Depository Shares Class Z Common Stock                      
Ordinary shares                      
Ordinary shares, issued (in shares)             42,000,000 42,000,000      
Price per share | $ / shares               $ 11.50      
Net proceeds from the offering, after deducting commissions and offerings expenses ¥ 2,817.5 $ 399.4     ¥ 2,170.8 $ 317.2 ¥ 2,781.8 $ 443.3      
Redesignation conversion ratio             1 1      
Proceeds from common stock and notes issued net of issuance cost     ¥ 1,647.7 $ 245.7