| In millions, except per share items | Jun-30-23 | Mar-31-23 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 |
| | 8-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q |
| Net income | 68.0 | -117.0 | 56.0 | 38.0 | -288.9 | 30.7 | -120.0 | -87.0 |
| Depreciation and amortization [+] | | 18.0 | 20.0 | 15.0 | 13.9 | | 19.0 | 24.0 |
| Depreciation | | 18.0 | 35.0 | 15.0 | 13.5 | | 43.0 | 24.0 |
| Amortization of intangible assets | | | | | 0.3 | | | |
| Asset impairment charges | | | | -63.0 | 137.4 | | 101.0 | 47.0 |
| Stock-based compensation | | 16.0 | 7.0 | 13.0 | 7.0 | | 11.0 | 10.0 |
| Deferred taxes | | 12.0 | -15.0 | 1.0 | 1.7 | | 5.0 | -5.0 |
| Change in working capital [+] | | | | | 21.2 | | -2.0 | -9.0 |
| Accounts receivable | | | | | -5.4 | | | |
| Accounts payable | | | | | 6.4 | | | |
| Other | | | | | 20.3 | | -2.0 | -9.0 |
| Other operating activities | | -90.0 | -13.0 | -192.0 | 352.6 | 6.6 | 62.0 | -210.0 |
| Cash from operations | | -161.0 | 55.0 | -188.0 | 244.9 | 37.4 | 76.0 | -230.0 |
| |
| Capital expenditures [+] | | -20.0 | -13.0 | -10.0 | -20.5 | 0.0 | -16.0 | -30.0 |
| Purchases of property and equipment | | -20.0 | -13.0 | -10.0 | -20.5 | | -16.0 | -30.0 |
| Sales of property and equipment | | 22.0 | 128.0 | 3.0 | 20.3 | | 35.0 | 8.0 |
| Purchases of short-term investments, net | | 11.0 | 83.0 | -76.0 | -60.1 | | -13.0 | 5.0 |
| Purchases of short-term investments | | -71.0 | -78.0 | -158.0 | -75.0 | | -25.0 | -6.0 |
| Sales of short-term investments | | 82.0 | 161.0 | 82.0 | 15.0 | | 12.0 | 11.0 |
| Other cash from investing | | | -16.0 | -22.0 | 3.4 | | 59.0 | -48.0 |
| Cash from investing | | 13.0 | 182.0 | -105.0 | -56.9 | 0.0 | 65.0 | -65.0 |
| |
| Cash dividends paid | | -10.0 | 10.0 | -10.0 | 9.4 | | | |
| Other cash from financing | | -151.0 | -48.0 | -6.0 | -105.3 | | 627.0 | 28.0 |
| Cash from financing | | -161.0 | -38.0 | -16.0 | -95.8 | 0.0 | 627.0 | 28.0 |
| |
| Free cash flow | | -181.0 | 42.0 | -198.0 | 224.4 | 37.4 | 60.0 | -260.0 |
| Per share (diluted) | | ($1.27) | $0.24 | ($1.38) | $1.59 | $0.26 | $0.43 | ($1.84) |