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Restricted Net Assets (Details) - Company's subsidiaries, VIEs and subsidiaries of VIEs incorporated in PRC
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
Dec. 31, 2019
USD ($)
Restricted Net Assets        
Portion of after-tax profit to be allocated to general reserve fund under PRC law (as a percent) 10.00%      
Required general reserve/registered capital ratio to de-force compulsory net profit allocation to general reserve (as a percent) 50.00%      
Restricted net assets ¥ 759.1 ¥ 552.2   $ 109.0
Maximum        
Restricted Net Assets        
Percentage of restricted net assets 25.00% 25.00% 25.00%