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Principal Accounting Policies - Employee social security and welfare benefits (Details)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Employee social security and welfare benefits        
Employee social security and welfare benefits ¥ 113.7 $ 16.3 ¥ 84.3 ¥ 79.4