| 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 |
| Net income | 19.6 | 17.0 | 16.6 | 14.4 | 13.4 | 13.0 | 11.8 | 12.5 |
| Depreciation and amortization | 10.1 | 8.9 | 8.2 | 7.7 | 7.0 | 6.8 | 6.4 | 6.2 |
| Stock-based compensation | 0.3 | 0.2 | 0.2 | 0.2 | 0.1 | 0.0 | 0.0 | |
| Deferred taxes | 0.0 | 0.2 | 0.1 | 0.6 | 0.1 | 2.5 | 1.6 | 2.3 |
| Change in working capital [+] | -7.4 | 5.2 | 3.3 | 1.9 | 4.0 | -2.3 | 2.3 | 2.9 |
| Accounts receivable | -3.0 | 0.2 | -1.9 | 0.3 | -0.5 | -0.6 | -0.9 | -0.1 |
| Other | -4.4 | 5.0 | 5.3 | 1.6 | 4.5 | -1.7 | 3.2 | 2.9 |
| Other operating activities | -0.6 | -8.5 | -8.1 | -5.9 | -6.2 | 0.1 | -2.9 | -3.1 |
| Cash from operations | 22.0 | 23.0 | 20.2 | 18.9 | 18.4 | 20.1 | 19.4 | 20.7 |
| |
| Capital expenditures [+] | -50.5 | -34.4 | -32.1 | -18.4 | -16.9 | -24.6 | -13.2 | -13.8 |
| Purchases of property and equipment | -50.5 | -34.4 | -32.1 | -18.4 | -16.9 | -24.6 | -13.2 | -13.8 |
| Sales of property and equipment | | | | | | | 0.0 | |
| Other cash from investing | -3.4 | -12.0 | -0.5 | -2.1 | 0.1 | -0.5 | 0.6 | -0.3 |
| Cash from investing | -53.9 | -46.4 | -32.6 | -20.5 | -16.8 | -25.1 | -12.5 | -14.2 |
| |
| Cash dividends paid | -10.7 | -9.8 | -9.4 | -9.0 | -8.6 | -8.2 | -8.0 | -7.7 |
| Issuance of common stock, net | 45.7 | 2.1 | 1.8 | 2.5 | 2.0 | 0.6 | 1.2 | -0.2 |
| Financing costs | | | -0.2 | -0.6 | | | | -0.3 |
| Other cash from financing | -3.1 | 26.2 | 24.8 | 7.5 | 5.0 | 8.3 | 1.3 | 2.5 |
| Cash from financing | 31.9 | 18.4 | 17.4 | 1.7 | -1.6 | 0.8 | -5.5 | -5.1 |
| |
| Free cash flow | -28.5 | -11.5 | -11.9 | 0.5 | 1.5 | -4.5 | 6.2 | 6.9 |
| Per share (diluted) | ($2.04) | ($0.88) | ($0.91) | $0.04 | $0.12 | ($0.35) | $0.48 | $0.54 |
| |
| Cash paid for interest | 4.0 | 4.1 | 4.2 | 4.8 | 5.2 | 4.7 | 5.1 | 5.0 |