INCOME TAXES - Valuation allowance (Details) - CNY (¥) ¥ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Uncertain tax benefits
Interest or penalty expense	¥ 0.0	¥ 0.0	¥ 0.0
Roll-forward of the unrecognized tax benefits
Beginning balance	18.0	14.0	26.0
Addition for tax positions	32.0	4.0	(12.0)
Ending balance	¥ 50.0	18.0	14.0
Withholding income tax rate (as a percentage)	10.00%
Withholding income tax rate with Hong Kong as holding company (as a percentage)	5.00%
PRC dividend withholding tax accrued	¥ 0.0	73.0
Additional provision for PRC dividend withholding tax accrued	¥ 0.0
Period of statute of limitations	3 years
Period of statute of limitations, if the underpayment is more than the specified amount	5 years
Minimum amount of underpayment of taxes for statute of limitations to be extended to five years	¥ 0.1
Period of statute of limitations for transfer pricing issues	10 years
GERMANY
Valuation allowance
Tax loss carryforwards	¥ 1,778.0
China
Valuation allowance
Tax loss carryforwards, expire between 2021 and 2024	888.0
Tax loss carryforwards, expire between 2021 and 2028	¥ 1,492.0
Maximum
Uncertain tax benefits
Market capitalization percent	2.00%
Minimum
Uncertain tax benefits
Market capitalization percent	0.50%
Valuation allowance for deferred tax assets
Valuation allowance
Charge to costs and expenses	¥ 249.0	79.0	36.0
Charge taken against allowance	¥ 32.0	24.0	43.0
Write off		¥ 10.0	¥ 9.0

The amount of additional provision for dividend withholding tax accrued.

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Amount of dividend withholding tax obligation accrued during the reporting period.

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Represents the withholding tax rate payable on dividend distributed by a foreign-invested enterprise in the PRC to its foreign investor who is a non-resident enterprise.

+ References

No definition available.

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Represents the withholding tax rate payable on dividend distributed by a foreign-invested enterprise, having the parent holding company incorporated in specified jurisdiction in the PRC to its foreign investor who is a non-resident enterprise.

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No definition available.

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Market capitalization percent.

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- Definition

Represents the minimum amount of underpayment of taxes for statute of limitations to be extended to five years.

+ References

No definition available.

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- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws, expire between 2021 and 2024.

+ References

No definition available.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws, expire between 2021 and 2028.

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Represents the period of statute of limitations for transfer pricing issues.

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No definition available.

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Represents the period of statute of limitations for underpayment of taxes which is due to computation errors made by the taxpayer.

+ References

No definition available.

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Represents the period of statute of limitations for underpayment of taxes of more than the specified amount.

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No definition available.

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Amount of increase (decrease) in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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Amount of unrecognized tax benefits.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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- Definition

Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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- Definition

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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No definition available.

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Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of decrease in valuation and qualifying accounts and reserves.

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