| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | S-1/A |
| Net income | 58.2 | 58.6 | 45.4 | 29.2 | 29.3 | 0.0 |
| Depreciation and amortization | 7.0 | 6.4 | 6.6 | 5.2 | 5.2 | 5.3 |
| Stock-based compensation | 2.8 | 1.6 | 1.3 | 0.9 | | |
| Deferred taxes | 1.4 | 1.5 | -1.6 | | | |
| Change in working capital [+] | 16.9 | -0.2 | 1.7 | 4.5 | 3.3 | 5.2 |
| Accrued expenses | 16.9 | -0.2 | 1.7 | 4.5 | 3.3 | |
| Other | | | | | | 5.2 |
| Other operating activities | 37.4 | 28.3 | -47.7 | -9.3 | -10.8 | 24.9 |
| Cash from operations | 123.6 | 96.3 | 5.6 | 30.5 | 26.9 | 35.3 |
| |
| Capital expenditures [+] | -4.5 | -2.9 | -3.3 | -4.0 | -3.1 | -9.0 |
| Purchases of property and equipment | -4.5 | -2.9 | -3.3 | -4.0 | -3.1 | -9.0 |
| Sales of property and equipment | 0.5 | 1.5 | 0.2 | 0.2 | 0.1 | |
| Acquisitions | | | -0.7 | | | |
| Purchases of short-term investments, net | -95.5 | 58.8 | -70.4 | -297.3 | -57.2 | |
| Purchases of short-term investments | -176.7 | -61.5 | -279.7 | -489.0 | -539.1 | |
| Sales of short-term investments | 81.3 | 120.3 | 209.4 | 191.8 | 481.9 | |
| Other cash from investing | -309.4 | -217.2 | -82.1 | 87.6 | -123.9 | -139.1 |
| Cash from investing | -408.9 | -159.8 | -156.2 | -213.5 | -184.1 | -148.1 |
| |
| Cash dividends paid | -8.0 | -5.4 | -2.5 | -1.1 | -30.0 | -7.9 |
| Issuance of common stock, net | -22.7 | -9.2 | -0.3 | 51.4 | | |
| Other cash from financing | 64.0 | 264.7 | 295.6 | 44.8 | 138.6 | 51.8 |
| Cash from financing | 33.3 | 250.1 | 292.8 | 95.1 | 108.6 | 43.9 |
| |
| Free cash flow | 119.1 | 93.4 | 2.3 | 26.5 | 23.8 | 26.3 |
| Per share (diluted) | $6.61 | $5.05 | $0.13 | $1.55 | $1.61 | |
| |
| Cash paid for interest | 21.8 | 13.5 | 16.1 | 28.1 | 22.0 | |