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Significant Accounting Policies - Sales and marketing expenses (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Significant Accounting Policies      
Marketing and promotional expenses ¥ 3,562.3 ¥ 3,131.0 ¥ 4,051.3