 
    
                                                | (in millions $) | 30 Jun 2021 | 31 Dec 2020 | 30 Jun 2020 | 31 Dec 2019 | 
|---|---|---|---|---|
| Current assets | ||||
| Cash | $119.24 | $155.31 | $342.52 | $162.9 | 
| Short term investments | $8.65 | |||
| Net receivables | $298.88 | $286.48 | $280.71 | $307.38 | 
| Inventory | $354.31 | $310.4 | $382.82 | $356.26 | 
| Total current assets | $1055.73 | $791.15 | $1054.71 | $860.72 | 
| Long term investments | $0.59 | $0.87 | $0.78 | $1.01 | 
| Property, plant & equipment | $1655.3 | $1806.38 | $1814.62 | $1975.64 | 
| Goodwill & intangible assets | ||||
| Total noncurrent assets | ||||
| Total investments | ||||
| Total assets | $4201.77 | $4153.52 | $4444.9 | $4543.89 | 
| Current liabilities | ||||
| Accounts payable | ||||
| Deferred revenue | ||||
| Short long term debt | $728.94 | $707.38 | $632.03 | $890.61 | 
| Total current liabilities | $1587.78 | $1485.43 | $1399.25 | $1621.03 | 
| Long term debt | $1112.17 | $1283.83 | $1812.25 | $1423.11 | 
| Total noncurrent liabilities | ||||
| Total debt | ||||
| Total liabilities | $2996.74 | $3094.74 | $3510.84 | $3366.74 | 
| Shareholders' equity | ||||
| Retained earnings | $1136.26 | $992.49 | $870.29 | $1115.72 | 
| Other shareholder equity | $1177 | |||
| Total shareholder equity | $1205.03 | $1058.78 | $934.06 | $1177.15 | 
| (in millions $) | 31 Dec 2020 | 31 Dec 2019 | 31 Dec 2018 | 31 Dec 2017 | 
|---|---|---|---|---|
| Current assets | ||||
| Cash | $138.77 | $145.34 | $121.93 | $152.75 | 
| Short term investments | $16.54 | $17.56 | $16.32 | $11.93 | 
| Net receivables | $286.48 | $307.38 | $262.88 | $291.2 | 
| Inventory | $310.4 | $356.26 | $330.5 | $349.74 | 
| Total current assets | $791.15 | $860.72 | $784.89 | $850.52 | 
| Long term investments | $0.87 | $1.01 | $1.09 | $1.2 | 
| Property, plant & equipment | $1806.38 | $1975.64 | $516.78 | $488.58 | 
| Goodwill & intangible assets | ||||
| Total noncurrent assets | ||||
| Total investments | ||||
| Total assets | $4153.52 | $4543.89 | $3014.13 | $3056.27 | 
| Current liabilities | ||||
| Accounts payable | $191.31 | $207.98 | $181.23 | $198.65 | 
| Deferred revenue | ||||
| Short long term debt | $707.38 | $890.61 | $515.26 | $612.94 | 
| Total current liabilities | $1485.43 | $1621.03 | $1197.29 | $1321.02 | 
| Long term debt | $1283.83 | $1423.11 | $362.95 | $377.2 | 
| Total noncurrent liabilities | ||||
| Total debt | ||||
| Total liabilities | $3094.74 | $3366.74 | $1851.68 | $2017.19 | 
| Shareholders' equity | ||||
| Retained earnings | $1216.19 | $1283.34 | $1259.03 | $1128.52 | 
| Other shareholder equity | -$223.7 | -$167.62 | -$157.05 | -$148.96 | 
| Total shareholder equity | $1058.78 | $1177.15 | $1162.45 | $1039.07 | 
| (in millions $) | 30 Jun 2021 | 31 Dec 2020 | 30 Jun 2020 | 31 Dec 2019 | 
|---|---|---|---|---|
| Revenue | ||||
| Total revenue | $1891.11 | $2028.44 | $1452.55 | $2044.06 | 
| Cost of revenue | $528.59 | $557.69 | $430.74 | $562.5 | 
| Gross Profit | $1362.52 | $1470.75 | $1021.81 | $1481.56 | 
| Operating activities | ||||
| Research & development | ||||
| Selling, general & administrative | $1168.64 | $1212.9 | $1121.74 | $1315.34 | 
| Total operating expenses | $1694.8 | $1772.43 | $1648.97 | $1878.16 | 
| Operating income | $196.31 | $256.01 | -$196.42 | $165.9 | 
| Income from continuing operations | ||||
| EBIT | ||||
| Income tax expense | $43.17 | $70.85 | -$16.9 | $20.58 | 
| Interest expense | -$2.77 | $0.14 | $0.81 | $0.32 | 
| Net income | ||||
| Net income | $214.97 | $145.29 | -$212.19 | $112.62 | 
| Income (for common shares) | $214.97 | $145.29 | -$212.19 | $112.62 | 
| (in millions $) | 31 Dec 2020 | 31 Dec 2019 | 31 Dec 2018 | 31 Dec 2017 | 
|---|---|---|---|---|
| Revenue | ||||
| Total revenue | $3480.99 | $4039.31 | $3720.98 | $3449.86 | 
| Cost of revenue | $988.43 | $1109.55 | $1003.55 | $923.56 | 
| Gross Profit | $2492.56 | $2929.76 | $2717.43 | $2526.3 | 
| Operating activities | ||||
| Research & development | ||||
| Selling, general & administrative | $2326.2 | $2605.12 | $2379.4 | $2201.45 | 
| Total operating expenses | $3421.4 | $3715.34 | $3383.65 | $3123.08 | 
| Operating income | $59.59 | $323.97 | $337.32 | $326.78 | 
| Income from continuing operations | ||||
| EBIT | ||||
| Income tax expense | $53.95 | $79.18 | $81.67 | $101.06 | 
| Interest expense | $0.95 | $0.67 | $0.7 | -$1.93 | 
| Net income | ||||
| Net income | -$66.89 | $178.48 | $216.28 | $227.93 | 
| Income (for common shares) | -$66.89 | $178.48 | $216.28 | $227.93 |