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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

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- References

No definition available.

+ Details

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- Definition

The total expense recognized in the period for promotion, public relations, and brand or product advertising.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

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