| In millions, except per share items | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 |
| | 20-F | 20-F | 20-F | 20-F | 20-F | 20-F | 20-F |
| Cash flows from operating activities | | | | | | | |
| Profit before income tax | | | | | | | |
| Adjustments to reconcile profit (loss) | | | | | | | |
| Depreciation expenses | | | | | | | |
| (Reversal of) expected credit losses | | | | | | | |
| Interest expense | | | | | | | |
| Interest income | | | | | | | |
| Dividend income | | | | | | | |
| Share-based payments | | | | | | | |
| Share of loss (profit) of associates and joint ventures accounted for using equity method | | | | | | | |
| Gain on valuation of financial assets at fair value through profit or loss | | | | | | | |
| Gain on disposal of property, plant and equipment, net | | | | | | | |
| Insurance compensation income | | | | | | | |
| Gain from lease modification | | | | | | | |
| Impairment loss on property, plant and equipment | | | | | | | |
| Gain on disposal of investment accounted for using equity method | | | | | | | |
| Deferred revenue | -10.1 | -12.3 | | | | | |
| |
| Financial assets at fair value through profit or loss | | | | | | | |
| Current contract assets | | | | | | | |
| Accounts and notes receivable | | | | | | | |
| Accounts receivable – related parties | 1.0 | -0.9 | | | | | |
| |
| Other receivables | | | | | | | |
| Other receivables – related parties | 4.9 | 12.4 | | | | | |
| |
| Inventories | | | | | | | |
| Prepayments | -10.5 | -4.3 | | | | | |
| Other non-current assets | -4.6 | -38.6 | 6.9 | 6.9 | | | |
| Current contract liabilities | -1.2 | -0.2 | 0.3 | | | | |
| |
| Accounts and notes payable | | | | | | | |
| Accounts payable – related parties | | -0.3 | 0.1 | 0.3 | | | |
| |
| Other payables | | | | | | | |
| Other payables – related parties | | -0.2 | | | | | |
| |
| Current provisions | | | | | | | |
| Current refund liabilities | -16.1 | -6.6 | | | | | |
| |
| Other current liabilities | | | | | | | |
| Net defined benefit liability, non-current | | | | | | | |
| Cash generated from operations | | | | | | | |
| Interest received | | | | | | | |
| Dividends received | | | | | | | |
| Interest paid | | | | | | | |
| Income tax paid | | | | | | | |
| Net cash generated from operating activities | | | | | | | |
| Cash flows from investing activities | | | | | | | |
| Decrease (increase) in financial assets at amortized cost | | | | | | | |
| Proceeds from insurance compensation | | 10.4 | | | | | |
| |
| Proceeds from disposal of investment accounted for using equity method | | | | | | | |
| |
| Acquisition of property, plant and equipment | | | | | | | |
| Proceeds from disposal of property, plant and equipment | | | | | | | |
| Decrease (increase) in refundable deposits | 0.0 | 0.9 | | | | | |
| Increase in other non-current assets | -4.6 | -38.6 | 6.9 | 6.9 | | | |
| Increase in long-term deferred revenue | 85.9 | 4.5 | | | | | |
| |
| Proceeds from sales of interests in associates | | | | | | | |
| Net cash used in investing activities | | | | | | | |
| Cash flows from financing activities | | | | | | | |
| Proceeds from short-term bank loans | | | | | | | |
| Payments on short-term bank loans | | | | | | | |
| Payment on lease liabilities | | | | | | | |
| Proceeds from long-term bank loans | | | | | | | |
| Payments on long-term bank loans | | | | | | | |
| Increase (decrease) in guarantee deposits | 0.6 | 0.0 | | | | | |
| |
| Cash dividend paid | | | | | | | |
| Net cash (used in) generated from financing activities | | | | | | | |
| Net increase (decrease) in cash and cash equivalents | | | | | | | |
| Effect of foreign exchange rate changes | | | | | | | |
| Cash and cash equivalents at beginning of year | | | | 233.7 | | | |