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| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Assets |
| Cash and equivalents | 235.3 | 413.1 | 885.6 | 46.5 | 32.7 | 107.7 | 22.4 | 49.5 |
| Short-term investments | 848.6 | 1,078.3 | 504.5 | 368.5 | 190.1 | 43.1 | 34.4 | 72.8 |
| Accounts receivable, net | 0.9 | | | | | | | |
| Inventories | 3.0 | | | | | | | |
| Other current assets | 21.2 | 16.6 | 13.5 | 9.4 | 3.9 | 4.9 | 2.8 | 3.1 |
| Total current assets | 1,109.0 | 1,508.0 | 1,403.6 | 424.4 | 226.7 | 155.8 | 59.6 | 125.4 |
| Property, plant, and equipment, net | 17.5 | 15.8 | 7.8 | 1.8 | 0.5 | 0.5 | 0.6 | 0.6 |
| Intangibles | 14.9 | | | | | | | |
| Long-term investments | 3.5 | 8.2 | 15.6 | | | | | |
| Other fixed assets | 21.6 | 19.0 | 9.2 | 5.4 | 1.3 | 1.0 | 3.3 | 2.0 |
| Total assets | 1,202.6 | 1,588.8 | 1,476.1 | 432.2 | 228.5 | 157.2 | 63.4 | 128.0 |
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| Accounts payable | 38.9 | 35.2 | 18.1 | 16.4 | 8.5 | 4.3 | 6.3 | 2.1 |
| Accrued expenses | 120.6 | 108.5 | 53.4 | 7.9 | 5.8 | 3.0 | 2.9 | 2.4 |
| Short-term debt | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Other current liabilities | | | | 24.6 | 11.8 | 6.3 | 5.8 | 5.3 |
| Total current liabilities | 159.4 | 143.7 | 71.5 | 48.9 | 26.1 | 13.6 | 15.0 | 9.8 |
| Other liabilities | 46.7 | 48.1 | 43.9 | 1.0 | 0.7 | 0.3 | 0.1 | 0.0 |
| Total liabilities | 206.1 | 191.7 | 115.3 | 49.9 | 26.9 | 14.0 | 15.1 | 9.8 |
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| Shareholders' equity [+] | 996.5 | 1,397.0 | 1,360.8 | 382.3 | 201.6 | 143.3 | 48.3 | 118.2 |
| Paid-in capital | 3,453.1 | 3,099.9 | 2,481.2 | 1,144.7 | 751.1 | 594.4 | 428.5 | 415.2 |
| Retained earnings | -2,452.9 | -1,712.0 | -1,130.2 | -772.3 | -559.0 | -460.6 | -389.8 | -306.6 |
| Tangible shareholders' equity | 981.6 | 1,397.0 | 1,360.8 | 382.3 | 201.6 | 143.3 | 48.3 | 118.2 |
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