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Interest and investment income, net - Gain/(loss) on derivative instruments (Details)	12 Months Ended
	Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)	Dec. 31, 2022 CNY (¥)
Interest and investment income, net
Unrealized investment income/(loss) of derivative instruments	¥ 222,975,608	$ 30,547,533	¥ (149,741,836)	¥ (180,503,919)
Realized investment income/(loss) of derivative instruments	(203,518,248)	(27,881,886)	303,576,774	110,083,438
Gain/(loss) on derivative instruments	¥ 19,457,360	$ 2,665,647	¥ 153,834,938	¥ (70,420,481)

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- Definition

The amount represents the realized investment income/(loss) of derivative instruments.

+ References

No definition available.

+ Details

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- Definition

The amount represents the unrealized investment income (loss) of derivative instruments.

+ References

No definition available.

+ Details

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A

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- References

No definition available.

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