| 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 | -45.4 | 5.7 | 7.7 | 11.9 | 44.8 | 73.6 | 45.4 | 25.6 |
| Depreciation and amortization [+] | 102.4 | 82.4 | 92.7 | 85.7 | 79.6 | 73.9 | 70.5 | 56.0 |
| Depreciation | 99.4 | 80.2 | 89.8 | 80.4 | 74.7 | 70.7 | 67.7 | 53.8 |
| Amortization | 2.9 | 2.2 | 2.9 | 5.3 | 4.8 | 3.3 | 2.8 | 2.2 |
| Asset impairment charges | | | | | | | | 0.2 |
| Stock-based compensation | 110.3 | 120.4 | 87.3 | 58.6 | 48.3 | 40.6 | 32.6 | 25.2 |
| Deferred taxes | -26.6 | -2.4 | 8.8 | -3.6 | -0.6 | -17.8 | 5.4 | 3.2 |
| Change in working capital [+] | 49.2 | -15.9 | -65.6 | 15.5 | 23.6 | -7.1 | -4.1 | 9.4 |
| Accounts receivable | -7.3 | -6.5 | -18.4 | -6.6 | 2.2 | -15.8 | -13.0 | -7.6 |
| Other current assets | 26.2 | -2.0 | 22.6 | 6.4 | -5.2 | -9.6 | -8.5 | -11.0 |
| Accounts payable | 21.6 | -9.7 | -20.0 | 12.9 | 9.5 | 1.0 | 3.7 | 6.1 |
| Deferred revenues | 11.1 | 10.5 | -0.5 | 12.5 | 19.2 | 22.2 | 14.4 | 12.6 |
| Other | -2.4 | -8.2 | -49.2 | -9.7 | -2.0 | -5.0 | -0.8 | 9.3 |
| Other operating activities | 14.1 | 23.5 | 17.0 | 14.4 | 5.7 | 13.0 | 3.8 | 9.5 |
| Cash from operations | 203.9 | 213.7 | 148.0 | 182.5 | 201.4 | 176.3 | 153.6 | 129.2 |
| |
| Capital expenditures [+] | -71.1 | -52.2 | -71.8 | -58.4 | -52.3 | -38.6 | -44.1 | -34.1 |
| Purchases of property and equipment | -12.3 | -11.7 | -29.7 | -11.5 | -14.7 | -10.2 | -17.7 | -18.6 |
| Capitalized product costs | -58.8 | -40.5 | -42.2 | -46.9 | -37.6 | -28.3 | -26.4 | -15.5 |
| Acquisitions | -20.9 | -419.1 | | -109.4 | -44.9 | -146.8 | -3.4 | -106.7 |
| Other cash from investing | 6.4 | | | 0.5 | -0.5 | 0.5 | | -0.5 |
| Cash from investing | -85.5 | -471.3 | -71.8 | -167.2 | -97.8 | -184.9 | -47.4 | -141.4 |
| |
| Cash dividends paid | | | -6.0 | -23.6 | -23.3 | -23.1 | -22.8 | -22.5 |
| Repurchase of common stock, net | | -108.4 | -41.0 | | | | | |
| Option exercises | | | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Financing costs | | -3.1 | -4.6 | | | -3.1 | | -0.4 |
| Other cash from financing | -25.7 | 369.4 | 31.7 | 134.8 | -268.6 | 298.6 | 14.3 | 151.9 |
| Cash from financing | -25.7 | 264.1 | -10.7 | 111.2 | -291.9 | 278.6 | -8.5 | 129.8 |
| |
| Free cash flow | 191.6 | 202.0 | 118.3 | 171.0 | 186.7 | 166.1 | 135.9 | 110.6 |
| Per share (diluted) | $2.58 | $3.35 | $1.56 | $2.57 | $3.10 | $2.88 | $2.32 | $2.05 |
| |
| Cash paid for interest | -33.4 | -16.4 | -15.7 | -19.9 | -15.3 | -10.6 | -9.6 | -7.2 |
| Cash paid for income taxes | -9.7 | -10.1 | -3.6 | -0.4 | 7.1 | -5.6 | -1.3 | -4.8 |