| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Jun-30-17 | Jun-30-16 | Jun-30-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | 15.6 | 15.4 | 10.3 | 9.0 | 7.1 | 5.1 | 4.0 | -5.1 |
| Depreciation and amortization [+] | 2.1 | 1.4 | 1.4 | 1.3 | 1.3 | 1.2 | 1.1 | 1.0 |
| Depreciation | 2.0 | 1.4 | 1.4 | 1.3 | 1.3 | 1.2 | 1.1 | 1.0 |
| Amortization of intangible assets | 0.1 | 0.0 | | | | | | |
| Stock-based compensation | 1.6 | 2.3 | 1.3 | 1.1 | 1.1 | 1.0 | | |
| Deferred taxes | -1.5 | 0.1 | -1.1 | 0.3 | -0.4 | -1.2 | -0.9 | -1.0 |
| Change in working capital [+] | -2.2 | -7.2 | 4.9 | 1.0 | 0.0 | -7.5 | 6.7 | 3.8 |
| Other current assets | -3.9 | -15.4 | 0.8 | -4.1 | -0.1 | 0.4 | -0.9 | 0.8 |
| Accrued expenses | 3.1 | 6.2 | 7.5 | 6.3 | 0.1 | -7.8 | 8.0 | 1.4 |
| Other | -1.4 | 2.0 | -3.4 | -1.3 | -0.1 | -0.2 | -0.3 | 1.6 |
| Other operating activities | 0.4 | 3.1 | -3.5 | 1.4 | 4.2 | 2.5 | -0.3 | 0.2 |
| Cash from operations | 15.9 | 15.2 | 13.3 | 14.1 | 13.3 | 1.1 | 10.6 | -1.2 |
| |
| Capital expenditures | -2.9 | -6.0 | -1.8 | -0.4 | -2.8 | -1.0 | -2.1 | -1.3 |
| Purchases of property and equipment | -2.9 | -6.0 | -1.8 | -0.4 | -2.8 | -1.0 | -2.1 | -1.3 |
| Purchases of short-term investments, net | -35.2 | 16.6 | -38.3 | -11.8 | 28.2 | 38.8 | 38.5 | -115.6 |
| Purchases of short-term investments | -78.4 | -152.9 | -305.7 | -58.5 | -63.0 | -41.5 | -123.2 | -149.0 |
| Sales of short-term investments | 43.2 | 169.5 | 267.4 | 46.7 | 91.2 | 80.3 | 161.7 | 33.4 |
| Other cash from investing | -199.5 | -147.4 | -275.9 | -7.8 | -86.0 | -118.2 | -129.5 | -2.6 |
| Cash from investing | -237.6 | -136.9 | -316.0 | -20.0 | -60.7 | -80.3 | -93.1 | -119.5 |
| |
| Cash dividends paid | -2.8 | -2.5 | -2.2 | -1.4 | -0.3 | | | |
| Issuance of common stock, net | -5.4 | -6.0 | -7.4 | -7.8 | -10.0 | -16.5 | -6.8 | 115.1 |
| Other cash from financing | 149.6 | 191.1 | 328.7 | 37.5 | 47.2 | 97.3 | 66.9 | 31.6 |
| Cash from financing | 141.3 | 182.6 | 319.1 | 28.3 | 36.9 | 80.8 | 60.1 | 146.7 |
| |
| Free cash flow | 13.0 | 9.1 | 11.4 | 13.7 | 10.5 | 0.2 | 8.5 | -2.4 |
| Per share (diluted) | $1.42 | $0.99 | $1.22 | $1.38 | $1.01 | $0.02 | $0.71 | ($0.20) |
| |
| Cash paid for interest | 10.5 | 4.6 | 8.0 | 11.6 | 8.8 | 5.1 | 4.8 | 4.6 |
| Cash paid for income taxes | 4.4 | 4.3 | 2.9 | 1.7 | 1.0 | | | |