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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, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Uncertain tax benefits          
Interest or penalty expense     ¥ 0.0 ¥ 0.0 ¥ 0.0
Roll-forward of the unrecognized tax benefits          
Beginning balance   ¥ 60.0 50.0 18.0 14.0
Addition for tax positions     10.0 32.0 4.0
Ending balance     ¥ 60.0 ¥ 50.0 18.0
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     ¥ 32.0    
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    
Tax liability reduction due to unrecognized tax benefits   ¥ 0.1      
Cash dividends declared $ 68       ¥ 678.0
Undistributed Earnings     ¥ 3,763.0    
GERMANY          
Valuation allowance          
Tax loss carryforwards     1,192.0    
China          
Valuation allowance          
Tax loss carryforwards, expire between 2022 and 2026     2,115.0    
Tax loss carryforwards, expire between 2022 and 2028     ¥ 1,532.0    
Maximum          
Uncertain tax benefits          
Market capitalization percent     2.00%    
Minimum          
Uncertain tax benefits          
Market capitalization percent     0.50%