| In millions, except per share items | Jun-30-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 |
| | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q |
| Net income | 11.2 | 16.5 | 18.6 | 19.9 | 16.4 | 20.1 | 18.7 | 17.4 |
| Depreciation and amortization [+] | 0.4 | 1.1 | 1.1 | 1.0 | 1.1 | 1.1 | 1.1 | 1.1 |
| Depreciation | 0.2 | 0.9 | 0.9 | 0.8 | 0.8 | 0.9 | 0.9 | 0.8 |
| Amortization of intangible assets | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| Stock-based compensation | | 0.7 | 1.0 | 0.7 | 0.9 | 0.6 | 0.8 | 1.0 |
| Deferred taxes | | 1.2 | | | | 2.2 | | |
| Change in working capital | | 8.6 | 25.2 | 25.3 | -25.1 | -3.0 | -2.6 | 1.4 |
| Other | | 8.6 | 25.2 | 25.3 | -25.1 | -3.0 | -2.6 | 1.4 |
| Other operating activities | -0.4 | 13.1 | -25.7 | -34.0 | 45.3 | -27.0 | 29.5 | 41.9 |
| Cash from operations | 11.3 | 41.2 | 20.2 | 13.0 | 38.6 | -6.1 | 47.5 | 62.8 |
| |
| Capital expenditures | -1.9 | -2.3 | -1.3 | -1.6 | -0.8 | -1.3 | -0.3 | -0.9 |
| Purchases of property and equipment | -1.9 | -2.3 | -1.3 | -1.6 | -0.8 | -1.3 | -0.3 | -0.9 |
| Sales of short-term investments, net [+] | | 18.6 | 22.3 | 21.3 | 43.1 | 33.3 | 21.2 | -5.3 |
| Purchases of short-term investments | | | -0.5 | -10.0 | -0.3 | -30.3 | -46.5 | -97.1 |
| Sales of short-term investments | | 18.6 | 22.8 | 31.3 | 43.3 | 63.6 | 67.7 | 91.8 |
| Other cash from investing | | -291.6 | -432.0 | -295.0 | -79.7 | 17.0 | -37.6 | -204.1 |
| Cash from investing | -1.9 | -275.3 | -411.0 | -275.3 | -37.4 | 49.0 | -16.8 | -210.4 |
| |
| Cash dividends paid | | -9.3 | -9.3 | -9.6 | -9.4 | -9.0 | -9.0 | -9.3 |
| Repurchase of common stock, net | | -0.1 | -0.9 | -9.3 | 0.0 | 0.0 | | 0.1 |
| Other cash from financing | | 229.1 | 435.2 | 151.7 | 57.9 | -155.7 | 146.5 | 118.2 |
| Cash from financing | 0.0 | 219.7 | 425.0 | 132.8 | 48.5 | -164.7 | 137.4 | 109.0 |
| |
| Free cash flow | 9.4 | 38.8 | 18.9 | 11.4 | 37.7 | -7.4 | 47.2 | 61.9 |
| Per share (diluted) | $0.55 | $2.23 | $1.09 | $0.65 | $2.16 | ($0.43) | $2.70 | $3.55 |
| |
| Cash paid for interest | | 16.4 | 8.0 | 4.2 | 3.5 | 3.6 | 3.9 | 4.6 |