| 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 | 84.4 | 109.2 | 77.6 | 42.1 | 65.2 | 7.4 | -25.6 | -17.6 |
| Depreciation and amortization | 15.5 | 14.4 | 6.1 | 4.6 | 5.0 | 3.8 | 2.1 | 1.1 |
| Stock-based compensation | | | | | 20.8 | 5.0 | 0.3 | 1.0 |
| Tax benefit from stock-based compensation | | | | | | | -0.8 | 0.0 |
| Deferred taxes | | | | | -39.0 | -1.1 | 0.8 | -0.6 |
| Change in working capital [+] | | | | | 0.0 | -2.6 | 4.7 | 12.8 |
| Accounts receivable | | | | | -1.9 | -7.0 | -1.4 | -0.7 |
| Other current assets | | | | | -11.8 | -2.3 | -2.2 | -0.8 |
| Accounts payable | | | | | 9.3 | 6.2 | 5.8 | 6.1 |
| Accrued expenses | | | | | | | | 2.5 |
| Deferred revenues | | | | | | | | 1.1 |
| Other | | | | | 4.3 | 0.5 | 2.5 | 4.7 |
| Other operating activities | 156.2 | -25.4 | 73.1 | 23.4 | -0.2 | 13.2 | 38.6 | 16.2 |
| Cash from operations | 256.1 | 98.3 | 156.7 | 70.1 | 51.7 | 25.7 | 20.0 | 12.9 |
| |
| Capital expenditures [+] | 17.3 | 13.9 | 7.5 | 14.2 | -7.5 | -7.4 | -7.2 | -7.6 |
| Purchases of property and equipment | 5.9 | 7.7 | 3.0 | 11.2 | -6.0 | -5.2 | -5.8 | -6.4 |
| Capitalized product costs | 11.3 | 6.2 | 4.6 | 3.0 | -1.5 | -2.2 | -1.4 | -1.3 |
| Acquisitions | | 64.3 | 21.1 | 19.1 | | | | |
| Purchases of short-term investments | | 120.0 | 100.0 | 177.8 | -212.8 | -50.0 | -59.8 | |
| Purchases of short-term investments | | 120.0 | 100.0 | 177.8 | -212.8 | -50.0 | -59.8 | |
| Other cash from investing | 55.5 | -266.3 | -145.5 | -233.4 | 140.0 | 44.8 | 15.0 | |
| Cash from investing | 72.7 | -68.1 | -16.9 | -22.3 | -80.3 | -12.6 | -52.0 | -7.6 |
| |
| Repurchase of common stock, net | 14.4 | | | | | 47.7 | -60.0 | -18.0 |
| Option exercises | 0.7 | 0.7 | 1.1 | 1.8 | 3.6 | 0.4 | 0.1 | 0.1 |
| Other cash from financing | -106.3 | 18.5 | -8.9 | -12.9 | -19.8 | -2.5 | 60.8 | 68.0 |
| Cash from financing | -92.6 | 17.8 | -10.1 | -14.7 | -23.4 | 44.8 | 0.7 | 50.0 |
| |
| Free cash flow | 262.0 | 106.0 | 159.7 | 81.3 | 45.8 | 20.5 | 14.2 | 6.6 |
| Per share (diluted) | $2.13 | $0.96 | $1.44 | $0.74 | $0.39 | $0.30 | $0.29 | $0.12 |
| |
| Cash paid for interest | 0.1 | | | | | | 0.0 | 0.0 |