| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-30-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 |
| | 10-K | 10-K | 8-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | 32.2 | 40.8 | | 35.2 | 40.0 | 34.9 | 22.3 | 20.6 |
| Depreciation and amortization | 14.7 | 11.6 | 11.6 | 10.5 | 10.1 | 9.8 | 9.7 | 8.8 |
| Asset impairment charges | 9.1 | | | | | | | |
| Stock-based compensation | 7.3 | 7.9 | 7.9 | 7.9 | 7.0 | 5.9 | 5.0 | 5.0 |
| Deferred taxes | | | 5.7 | | 4.7 | 4.8 | -4.9 | 3.0 |
| Change in working capital [+] | -15.5 | -11.1 | 4.5 | 19.5 | -14.1 | 0.4 | 1.0 | -0.3 |
| Accounts receivable | -10.6 | -11.0 | | 2.6 | -8.9 | -4.5 | -6.5 | -3.7 |
| Other current assets | | | -0.1 | | | | | |
| Other | -4.9 | -0.1 | 4.7 | 16.9 | -5.2 | 4.9 | 7.4 | 3.3 |
| Other operating activities | 10.8 | 27.2 | | 26.9 | 14.8 | 17.2 | 23.4 | 14.1 |
| Cash from operations | 58.5 | 76.4 | 76.4 | 100.0 | 62.4 | 73.0 | 56.5 | 51.1 |
| |
| Capital expenditures [+] | -8.2 | -8.2 | -8.2 | -7.6 | -10.2 | -7.2 | -7.1 | -8.3 |
| Purchases of property and equipment | -8.2 | -8.2 | -8.2 | -7.6 | -10.2 | -7.2 | -7.1 | -8.3 |
| Sales of property and equipment | | | | | | | 0.1 | 0.1 |
| Acquisitions | -59.8 | -86.8 | | -23.9 | -30.6 | -16.4 | -36.7 | -23.6 |
| Other cash from investing | -13.2 | -29.1 | | -19.7 | 2.8 | -0.3 | 0.1 | -0.7 |
| Cash from investing | -81.3 | -124.1 | -124.1 | -51.2 | -38.0 | -23.9 | -43.6 | -32.5 |
| |
| Cash dividends paid | -21.3 | -18.8 | -18.8 | -4.1 | -14.6 | -11.7 | -10.1 | -8.5 |
| Financing costs | -1.8 | | | | | | | |
| Other cash from financing | 45.3 | 62.1 | | -35.3 | -9.7 | -36.0 | -1.0 | -5.8 |
| Cash from financing | 25.8 | 43.4 | 43.4 | -39.4 | -24.3 | -47.7 | -11.1 | -14.3 |
| |
| Free cash flow | 50.3 | 68.2 | 68.2 | 92.4 | 52.3 | 65.8 | 49.4 | 42.8 |
| Per share (diluted) | $3.87 | $5.29 | | $7.20 | $4.10 | $5.20 | $3.93 | $3.42 |
| |
| Cash paid for interest | 5.7 | 1.4 | 1.4 | 1.2 | 1.9 | 2.4 | 2.1 | 0.8 |
| Cash paid for income taxes | 7.6 | 12.2 | 12.2 | 7.7 | 9.9 | 9.2 | 8.5 | 10.6 |