| In millions, except per share items | Jun-30-23 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Sep-30-21 | Jun-30-21 | Mar-31-21 | Dec-31-20 |
| | 10-Q | 10-Q | 10-Q | 10-Q | 10-Q | 10-Q | 10-Q | 8-K |
| Net income | 16.0 | 21.7 | 15.5 | 21.0 | 26.7 | 18.8 | 14.9 | 8.1 |
| Depreciation and amortization | | 1.2 | 1.2 | 1.2 | 1.3 | 1.3 | 1.4 | |
| Asset impairment charges | | | | | | 0.6 | | |
| Stock-based compensation | | 1.1 | -1.1 | 1.1 | 1.1 | 1.6 | 0.6 | |
| Deferred taxes | | -0.8 | -3.4 | 3.4 | 1.0 | -0.6 | 1.8 | |
| Change in working capital [+] | | 18.1 | 3.3 | -22.7 | 2.5 | 4.0 | -5.7 | |
| Accounts receivable | | 2.5 | | | | | | |
| Other | | 15.6 | 3.3 | -22.7 | 2.5 | 4.0 | -5.7 | |
| Other operating activities | -13.0 | -2.6 | -6.9 | 10.4 | -9.2 | 25.5 | -22.8 | |
| Cash from operations | 3.0 | 38.7 | 8.7 | 14.5 | 23.4 | 51.2 | -9.7 | |
| |
| Capital expenditures [+] | 0.0 | -0.7 | 2.1 | -1.0 | -0.5 | 0.0 | -0.1 | |
| Purchases of property and equipment | | -0.7 | 2.1 | -1.0 | -0.5 | 0.0 | -0.1 | |
| Sales of property and equipment | | 0.0 | | 0.0 | 0.4 | 0.1 | | |
| Purchases of short-term investments, net | | -1.8 | 133.5 | -37.6 | -5.4 | -22.6 | -41.2 | |
| Purchases of short-term investments | | -8.9 | 122.5 | -49.1 | -44.1 | -50.0 | -74.6 | |
| Sales of short-term investments | | 7.1 | 10.9 | 11.6 | 38.7 | 27.4 | 33.3 | |
| Other cash from investing | | -145.5 | -333.0 | -92.7 | 4.7 | 272.5 | -73.3 | |
| Cash from investing | 0.0 | -148.1 | -197.5 | -131.2 | -0.8 | 250.0 | -114.7 | |
| |
| Repurchase of common stock, net | | -10.8 | -3.4 | -16.6 | 0.0 | -12.9 | -1.1 | |
| Other cash from financing | | 151.7 | 192.9 | -72.5 | 73.4 | -698.3 | 347.4 | |
| Cash from financing | 0.0 | 140.8 | 189.5 | -89.1 | 73.4 | -711.2 | 346.4 | |
| |
| Free cash flow | 3.0 | 37.9 | 10.8 | 13.5 | 22.8 | 51.2 | -9.9 | |
| Per share (diluted) | $0.06 | $0.76 | $0.22 | $0.27 | $0.44 | $0.98 | ($0.19) | |
| |
| Cash paid for interest | | 14.8 | 6.1 | 4.8 | 5.7 | 6.4 | 7.3 | |
| Cash paid for income taxes | | 6.7 | 3.9 | | 4.1 | 4.1 | 0.1 | |