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INCOME TAXES - Valuation allowance (Details)
¥ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
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   ¥ 65.0 60.0 50.0 18.0  
Addition for tax positions     5.0 10.0 32.0  
Ending balance     ¥ 65.0 60.0 ¥ 50.0  
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     ¥ 100.0 ¥ 32.0    
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      
Tax liability reduction due to unrecognized tax benefits   ¥ 0.1        
Cash dividends declared | $ $ 68          
GERMANY            
Valuation allowance            
Tax loss carryforwards     ¥ 1,555.0      
China            
Valuation allowance            
Tax loss carryforwards, expire between 2022 and 2026     ¥ 4,901.0      
Maximum [Member]            
Uncertain tax benefits            
Market capitalization percent           2.00%
Minimum [Member]            
Uncertain tax benefits            
Market capitalization percent           0.50%