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Short-term Loans (Details) ¥ in Millions, $ in Millions		12 Months Ended
	Aug. 09, 2018 USD ($) item	Dec. 31, 2020 CNY (¥)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2020 USD ($)
Short-term Loan
Short-term loan, fixed interest rate (as a percent)		4.57%	0.65%	4.57%
Weighted average interest rate for the outstanding short-term loans (as a percent)		0.86%	2.38%	0.86%
Deposits to secure short-term loan		¥ 1,295.0	¥ 1,595.0	$ 198.5
Credit facilities not utilized				1,410.6
Syndicated facility agreement
Short-term Loan
Short-term loan, maturity term	3 years
Aggregate amount of facilities agreement	$ 500.0
Number of mandated lead arrangers and bookrunners | item	4
Commitment fee	0.20%
Borrowings outstanding				500.0
Syndicated facility agreement | LIBOR
Short-term Loan
Basis points	0.95%
Guarantee agreements
Short-term Loan
Aggregate amount of facilities agreement				1,523.0
Unutilized amount of credit facilities taken by its subsidiaries				$ 446.1
Equal to or more than
Short-term Loan
Short-term loan, maturity term		7 days	7 days
Less than
Short-term Loan
Short-term loan, maturity term		1 year	1 year

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- Definition

The number of mandated lead arrangers and bookrunners to the facility agreement.

+ References

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Amount of assets pledged to secure a debt instrument.

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-SubTopic 470
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Weighted average interest rate of short-term debt outstanding calculated at point in time.

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