| 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 |
| | 8-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Total revenues | 241.7 | 0.0 | 128.4 | 141.0 | 135.4 | 104.8 | 111.1 | 148.0 |
| Revenue growth | | -100.0% | -8.9% | 4.1% | 29.2% | -5.7% | -24.9% | -83.5% |
| Cost of goods sold [+] | 173.9 | 0.0 | 111.5 | 109.9 | 105.4 | 87.9 | 195.4 | 315.3 |
| Cost of product sales | | | | | | | 99.0 | 159.2 |
| Coal costs | | | | | | | 96.4 | 156.1 |
| Gross profit | 67.8 | 0.0 | 17.0 | 31.1 | 30.0 | 16.9 | -84.3 | -167.3 |
| Gross margin | 28.1% | | 13.2% | 22.1% | 22.1% | 16.1% | -75.9% | -113.1% |
| Selling, general and administrative | 63.9 | 4.3 | 53.1 | 53.8 | 49.2 | 47.5 | 48.9 | 40.1 |
| Equity in earnings | 57.3 | | 60.2 | -63.9 | -65.0 | -61.4 | 1.2 | 2.0 |
| Other operating expenses | -71.5 | 0.5 | -57.6 | -61.3 | -62.0 | -59.2 | -149.1 | -201.9 |
| EBITDA [+] | 136.4 | | 99.9 | -9.0 | -7.6 | -19.9 | 30.2 | 13.9 |
| EBITDA growth | -2941.0% | -104.8% | -1205.9% | 19.1% | -62.0% | -165.9% | 117.4% | -76.6% |
| EBITDA margin | 56.4% | | 77.7% | -6.4% | -5.6% | -19.0% | 27.2% | 9.4% |
| Depreciation and amortization | | | 15.5 | 13.6 | 11.6 | 10.6 | 10.5 | 14.8 |
| EBITA | 136.4 | -4.8 | 84.3 | -22.7 | -19.2 | -30.6 | 19.7 | -0.9 |
| EBITA margin | 56.4% | | 65.6% | -16.1% | -14.2% | -29.2% | 17.7% | -0.6% |
| Amortization of intangibles | 3.7 | | 2.6 | 2.6 | 3.0 | 2.1 | 2.5 | 2.6 |
| EBIT [+] | 132.7 | -4.8 | 81.7 | -25.3 | -22.3 | -32.7 | 17.2 | -3.5 |
| EBIT growth | -2863.6% | -105.9% | -423.5% | 13.5% | -31.9% | -290.4% | -594.8% | -111.1% |
| EBIT margin | 54.9% | | 63.6% | -17.9% | -16.4% | -31.2% | 15.5% | -2.3% |
| Non-recurring items [+] | 5.4 | | 8.1 | -0.2 | -0.9 | -4.1 | 17.6 | -1.8 |
| Asset impairment | 7.9 | | 8.4 | | | 1.0 | 17.4 | |
| Loss (gain) on sale of assets | -2.5 | -0.1 | -0.3 | -0.2 | -0.9 | -5.1 | 0.2 | -1.8 |
| Interest expense, net [+] | 2.0 | | 0.2 | -2.7 | 2.0 | 3.4 | 4.3 | 5.0 |
| Interest expense | 2.0 | | 1.4 | 0.9 | 2.0 | 3.4 | 4.3 | 5.0 |
| Interest income | | | 1.2 | 3.6 | | | | |
| Other income (expense), net [+] | -37.5 | -0.3 | -59.2 | 65.7 | 65.5 | 61.1 | -1.9 | -0.6 |
| Other | 0.7 | -0.3 | 1.4 | 0.5 | 0.0 | 0.1 | -2.2 | 0.3 |
| Pre-tax income | 87.7 | -5.1 | 14.3 | 43.4 | 42.2 | 29.1 | -6.7 | -7.2 |
| Income taxes | 27.1 | -0.5 | -0.5 | 3.8 | 7.4 | 0.6 | -9.6 | -9.5 |
| Tax rate | 30.9% | 9.0% | | 8.7% | 17.5% | 2.2% | 144.2% | 131.4% |
| Earnings from continuing ops | 74.2 | 48.1 | 14.8 | 39.6 | 34.8 | 28.5 | 3.0 | 2.3 |
| Earnings from discontinued ops | | | | | | 4.1 | | |
| Net income | 74.2 | 48.1 | 14.8 | 39.6 | 34.8 | 30.3 | 29.6 | 22.0 |
| Net margin | 30.7% | | 11.5% | 28.1% | 25.7% | 29.0% | 26.7% | 14.9% |
| |
| Basic EPS [+] | $10.14 | $6.73 | $2.11 | $5.68 | $5.02 | $4.17 | $0.43 | $0.32 |
| Growth | 50.6% | 219.9% | -63.0% | 13.1% | 20.6% | 861.2% | 33.5% | -106.5% |
| Diluted EPS [+] | $10.06 | $6.69 | $2.10 | $5.66 | $5.00 | $4.14 | $0.43 | $0.32 |
| Growth | 50.3% | 219.3% | -62.9% | 13.2% | 20.7% | 860.2% | 33.2% | -106.4% |
| |
| Dividends per share [+] | | $0.79 | $0.77 | $0.74 | $0.66 | $0.98 | $1.07 | $1.05 |
| Growth | -100.0% | 2.3% | 4.4% | 11.4% | -32.5% | -8.2% | 1.9% | 2.2% |
| |
| Shares outstanding (basic) [+] | 7.3 | 7.1 | 7.0 | 7.0 | 6.9 | 6.8 | 6.8 | 7.0 |
| Growth | 2.3% | 1.7% | 0.7% | 0.7% | 1.4% | 0.2% | -2.6% | -7.8% |
| Shares outstanding (diluted) [+] | 7.4 | 7.2 | 7.1 | 7.0 | 7.0 | 6.9 | 6.9 | 7.0 |
| Growth | 2.5% | 1.9% | 0.7% | 0.7% | 1.3% | 0.3% | -2.4% | -7.5% |
| |
| EBIT is a non-GAAP figure that excludes all non-recurring expenses: restructuring costs, asset impairments, IPR&D writeoffs, and other unusual charges. |