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Principal Accounting Policies - Revenue recognition (Details)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Accounting Policies [Abstract]        
Agency service fees to third-party advertising agencies ¥ 180.7 $ 26.0 ¥ 215.2 ¥ 223.3
Revenues recognized from noncash transactions 8.7 1.3 17.8 ¥ 4.4
Revenue from advertising-for-advertising barter transactions ¥ 7.4 $ 1.1 ¥ 4.7