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Income Taxes - Net operating loss carryforward (Details) - Dec. 31, 2019
¥ in Millions, $ in Millions
CNY (¥)
USD ($)
Income Tax Disclosure [Abstract]    
Net operating loss carryforward ¥ 827.4 $ 118.8
Net operating tax loss carryforward, expire in 2020 29.0  
Net operating tax loss carryforward, expire in 2021 67.3  
Net operating tax loss carryforward, expire in 2022 69.7  
Net operating tax loss carryforward, expire in 2023 222.3  
Net operating tax loss carryforward, expire in 2024 ¥ 439.1