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Share-based Compensation - Stock option plan (Details) - CNY (¥) ¥ / shares in Units, ¥ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation. |  |  |
Unrecognized compensation expenses related to unvested awards granted | ¥ 89.6 | ¥ 79.5 | ¥ 77.0
Weighted average grant date fair value of options granted | ¥ 0.00 | ¥ 0.00 | ¥ 1.8692

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