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| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Assets |
| Cash and equivalents | 463.5 | 428.7 | 298.1 | 283.1 | 307.5 | 288.9 | 259.3 | 227.8 |
| Short-term investments | | 6.0 | 14.4 | 23.2 | 35.2 | 37.9 | 43.2 | 69.6 |
| Accounts receivable, net | 6.4 | 8.1 | 6.1 | 4.1 | 2.7 | 3.1 | 4.0 | 2.2 |
| Other current assets | 20.0 | 21.2 | 15.9 | 6.4 | 85.7 | 85.8 | 85.3 | 84.6 |
| Total current assets | 489.9 | 464.0 | 334.5 | 316.7 | 431.1 | 415.7 | 391.9 | 384.3 |
| Property, plant, and equipment, net | 698.9 | 720.9 | 716.8 | 730.3 | 754.3 | | | |
| Other fixed assets | 36.4 | 37.4 | 6.7 | 29.1 | 27.9 | 27.4 | 24.8 | 23.7 |
| Total assets | 1,392.0 | 1,404.1 | 1,265.5 | 1,285.5 | 1,632.4 | 1,451.2 | 1,447.8 | 1,418.4 |
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| Short-term debt | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Other current liabilities | 45.6 | 36.9 | 33.2 | 31.6 | 45.3 | 43.1 | 38.7 | 39.0 |
| Total current liabilities | 45.6 | 36.9 | 33.2 | 31.6 | 45.3 | 43.1 | 38.7 | 39.0 |
| Long-term debt | 1,089.6 | 1,156.2 | 971.0 | 965.8 | 1,240.2 | 1,052.4 | 1,053.3 | 1,028.0 |
| Other liabilities | 4.2 | 7.9 | 7.9 | 3.0 | 2.9 | 2.9 | 3.0 | 3.0 |
| Total liabilities | 1,139.4 | 1,200.9 | 1,012.0 | 1,000.5 | 1,288.4 | 1,098.4 | 1,094.9 | 1,070.0 |
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| Shareholders' equity [+] | 252.6 | 203.2 | 253.5 | 285.1 | 344.0 | 352.8 | 352.9 | 348.4 |
| Paid-in capital | 33.4 | 33.0 | 32.4 | 32.0 | 31.6 | 31.2 | 30.7 | 30.1 |
| Retained earnings | 206.9 | 166.2 | 216.4 | 248.4 | 302.5 | 309.0 | 304.3 | 299.0 |
| Treasury stock | -0.4 | -0.4 | -0.4 | -0.4 | -0.4 | -0.4 | -0.4 | -0.4 |
| Tangible shareholders' equity | 252.6 | 203.2 | 253.5 | 285.1 | 344.0 | 352.8 | 352.9 | 348.4 |
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