| Assets | — | — |
| Current assets | — | — |
| Cash and cash equivalents | 481.58a | 268.21a |
| Trade accounts receivable, net | 362.14a | 509.68a |
| Inventories, net | 169.27a | 231.34a |
| Prepaid expenses and other current assets | 23.68a | 39.06a |
| Total current assets | 1,036.67a | 1,048.3a |
| Property, plant, and equipment, net | 634.87a | 588.99a |
| Owned and leased mineral rights, net | 443.47a | 451.16a |
| Other acquired intangibles, net | 39.88a | 46.58a |
| Long-term restricted cash | 122.58a | 115.92a |
| Long-term restricted investments | 43.13a | 40.6a |
| Deferred income taxes | 6.52a | 8.03a |
| Other non-current assets | 111.59a | 106.49a |
| Total assets | 2,438.71a | 2,406.06a |
| Liabilities and stockholders’ equity | — | — |
| Current liabilities | — | — |
| Current portion of long-term debt | 2.92a | 3.58a |
| Trade accounts payable | 96.63a | 128.84a |
| Accrued expenses and other current liabilities | 151.56a | 177.51a |
| Total current liabilities | 251.11a | 309.93a |
| Long-term debt | 2.87a | 6.79a |
| Workers’ compensation and black lung obligations | 182.96a | 189.23a |
| Pension obligations | 100.6a | 101.91a |
| Asset retirement obligations | 189.81a | 166.51a |
| Deferred income taxes | 40.49a | 39.14a |
| Other non-current liabilities | 21.39a | 18.62a |
| Total liabilities | 789.21a | 832.13a |
| Stockholders’ equity | — | — |
| Preferred stock | 0a | 0a |
| Common stock | 0.22a | 0.22a |
| Additional paid-in capital | 839.8a | 834.48a |
| Accumulated other comprehensive loss | -50.08a | -40.59a |
| Treasury stock, at cost | -1,296.92a | -1,189.72a |
| Retained earnings | 2,156.47a | 1,969.53a |
| Total stockholders’ equity | 1,649.5a | 1,573.93a |
| Total liabilities and stockholders’ equity | 2,438.71a | 2,406.06a |