| In millions, except per share items | Jun-30-23 | Mar-31-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Cash flows from operating activities | | | | | | | | |
| Net income (loss) | -9.9 | 21.1 | 14.9 | 15.8 | -3.1 | -12.4 | 22.3 | 9.2 |
| |
| Adjustments to reconcile net income to net cash from operating activities: | | | | | | | | |
| Depreciation | 2.6 | 2.6 | 2.6 | 2.6 | 2.7 | 2.6 | 2.6 | 2.7 |
| Amortization of deferred financing costs | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Benefit for deferred income taxes | 0.0 | 0.0 | -1.6 | 1.4 | -1.0 | -0.7 | 1.7 | -3.3 |
| Change in fair value of equity securities | -2.6 | -0.5 | 0.4 | 0.6 | 3.2 | 4.1 | -0.1 | 0.8 |
| Change in fair value of derivative instruments | 1.6 | -4.9 | 2.7 | -0.7 | -0.9 | -1.5 | -1.5 | 1.0 |
| Loss on the sale of investments | 2.5 | | | | | 0.0 | | |
| Loss on disposal of property and equipment | 0.0 | | 0.0 | 0.0 | 0.0 | 0.0 | | 0.0 |
| Noncash interest expense | 0.0 | 0.0 | | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Changes in operating assets and liabilities: | | | | | | | | |
| Accounts receivable | -2.6 | 0.3 | -2.5 | 13.8 | -19.4 | 11.3 | -2.8 | 4.9 |
| Accounts receivable – related parties | 0.0 | | 0.0 | 0.1 | -0.1 | 0.1 | 0.0 | -0.1 |
| Inventory | 1.9 | -42.5 | -9.4 | 14.2 | 6.0 | -10.7 | 16.8 | 9.8 |
| Income tax receivable | 0.0 | 0.0 | 0.0 | 7.8 | 0.0 | 0.0 | 0.0 | 7.1 |
| Prepaid expenses | 1.2 | 0.5 | -2.8 | 0.9 | 1.1 | 0.6 | -2.8 | 1.2 |
| Prepaid expenses - related parties | | | | | | 0.0 | 0.0 | |
| Other assets | 7.0 | -5.2 | 0.5 | 0.2 | 0.1 | 0.0 | 0.2 | -0.1 |
| Accounts payable | -6.7 | 0.4 | 4.5 | -9.9 | 19.9 | -0.7 | -11.3 | -9.7 |
| Accounts payable - related parties | 0.0 | 0.0 | -0.5 | 0.0 | 0.3 | 0.1 | -0.7 | -0.3 |
| Accrued expenses and other current liabilities | 0.6 | -0.3 | -1.0 | 0.7 | 0.3 | -0.9 | 1.3 | -0.4 |
| Accrued expenses and other current liabilities – related parties | | 0.0 | 0.0 | | | 0.0 | | |
| Deferred revenue | -0.8 | -1.3 | 0.1 | -1.4 | -0.5 | -2.3 | -1.3 | -0.3 |
| Other noncurrent liabilities | 0.5 | -0.1 | -0.1 | -0.1 | -0.1 | -0.1 | -0.2 | -0.2 |
| Net cash used in operating activities | -4.5 | -29.8 | 8.3 | 46.0 | 8.7 | -10.6 | 24.3 | 22.2 |
| |
| Cash flows from investing activities | | | | | | | | |
| Collateralization of derivative instruments | -7.5 | 4.3 | -1.3 | 0.5 | 3.0 | -2.7 | 1.8 | -0.5 |
| Proceeds from the sale of marketable securities | 37.7 | | 1.0 | 0.0 | | 0.3 | | 2.8 |
| Proceeds from the sale of property and equipment | | | | 0.0 | | 0.1 | | |
| Capital expenditures | -1.4 | -2.5 | -1.1 | -1.8 | -0.9 | -1.0 | -0.8 | -0.2 |
| Net cash provided by (used in) investing activities | 28.8 | 1.9 | -1.3 | -1.3 | 2.1 | -3.3 | -0.9 | -0.4 |
| |
| Cash flows from financing activities | | | | | | | | |
| Payment of dividends | -2.6 | -2.6 | -2.6 | -2.6 | -2.6 | -2.6 | -2.6 | -2.6 |
| Deferred financing costs | | 0.0 | | | | | | |
| Net cash used in financing activities | -2.6 | -2.6 | -2.6 | -2.6 | -2.6 | -2.6 | -2.6 | -2.6 |
| Net change in cash and cash equivalents | 21.6 | -30.6 | 4.4 | 42.1 | 8.2 | -16.5 | 20.7 | 19.2 |
| Cash paid for income taxes | 0.0 | | 0.0 | -0.2 | 0.3 | | | 0.0 |
| |
| Noncash investing and financing activities: | | | | | | | | |
| Noncash capital expenditures | 0.0 | 0.3 | 0.0 | 0.1 | -0.1 | 0.2 | 0.3 | 0.0 |