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Taxation (Deferred Tax Assets and Liabilities, Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Income Tax Disclosure [Abstract]  
Net operating losses from PRC entities available to offset against future net profit for income tax purposes $ 1,850.0
Deferred tax assets generated from net operating losses offset by valuation allowance 285.8
PRC net operating losses generated from previous years, expired $ 48.5