| 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/A | 10-K | 10-K | 10-K | 10-K |
| Net income | 159.1 | 164.8 | 140.5 | 63.7 | 64.6 | 51.0 | 50.6 | 61.7 |
| Depreciation and amortization | 63.0 | 42.8 | 35.7 | 26.7 | 26.0 | 21.9 | 20.8 | 19.7 |
| Stock-based compensation | 2.7 | 2.0 | 1.3 | 1.8 | 0.7 | 0.6 | 0.6 | 0.4 |
| Deferred taxes | | | | | 0.2 | | -0.2 | 0.0 |
| Change in working capital [+] | -46.6 | 65.6 | -19.2 | -3.1 | 23.9 | -3.0 | 14.5 | -20.7 |
| Accounts receivable | -9.1 | 0.3 | -2.5 | 8.4 | 1.4 | -3.8 | 15.8 | -7.2 |
| Other current assets | 2.2 | 0.1 | 11.4 | -7.7 | 15.2 | -11.7 | 2.0 | -0.9 |
| Deferred revenues | | | | | | | | -0.6 |
| Other | -39.8 | 65.2 | -28.1 | -3.8 | 7.3 | 12.5 | -3.4 | -12.0 |
| Other operating activities | 14.1 | 0.0 | 34.7 | 41.4 | 37.6 | 20.7 | 14.4 | 6.9 |
| Cash from operations | 192.2 | 275.2 | 193.0 | 130.4 | 153.0 | 91.2 | 100.7 | 68.0 |
| |
| Capital expenditures [+] | -141.1 | -23.1 | -13.3 | -9.1 | -12.9 | -18.2 | -11.3 | -20.4 |
| Purchases of property and equipment | -141.1 | -23.1 | -13.3 | -9.1 | -12.9 | -18.2 | -11.3 | -20.4 |
| Sales of property and equipment | 0.1 | 0.3 | 0.1 | 0.1 | 0.5 | 0.0 | 0.2 | 1.2 |
| Purchases of intangible assets | -5.6 | -1.0 | 0.0 | | -144.2 | -2.6 | | |
| Acquisitions | -625.6 | | | | | | | |
| Other cash from investing | 1.7 | 7.4 | -110.0 | -138.5 | -71.4 | -9.2 | -61.6 | -37.4 |
| Cash from investing | -770.4 | -16.4 | -123.1 | -147.4 | -228.0 | -29.9 | -72.7 | -56.6 |
| |
| Cash dividends paid | 170.9 | 161.6 | 136.8 | 113.7 | 97.7 | 85.6 | 75.0 | |
| Financing costs | -8.2 | -6.2 | | | -5.3 | -6.0 | | |
| Other cash from financing | 402.8 | -426.6 | -208.0 | -95.7 | -28.0 | -148.2 | -103.0 | -13.3 |
| Cash from financing | 581.9 | -258.8 | -71.2 | 18.0 | 74.9 | -56.7 | -28.0 | -13.3 |
| |
| Free cash flow | 51.1 | 252.1 | 179.7 | 121.3 | 140.0 | 73.0 | 89.4 | 47.7 |
| Per share (diluted) | $1.17 | $5.80 | $5.35 | $4.97 | $5.74 | $3.00 | $3.96 | $3.86 |
| |
| Cash paid for interest | 78.1 | 44.6 | 40.6 | 44.8 | 39.0 | 19.4 | 12.2 | 9.0 |