| 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 | 6.2 | 21.0 | 33.6 | 60.8 | 87.7 | 62.0 | 69.3 | 56.6 |
| Adjustments to reconcile net income to net cash from operations from operating activities: | | | | | | | | |
| Amortization of patent formulations | | | | | | | | |
| Amortization of other intangibles | | | | | | | | |
| Inventory write-off and disposal | | | | | | | | |
| Depreciation of fixed assets | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 |
| Amortization of debt issuance costs | 0.5 | 0.5 | -1.4 | 3.0 | 0.5 | 0.1 | 0.7 | 2.1 |
| Deferred taxes | 0.4 | 0.8 | 13.7 | -4.5 | -1.8 | -1.7 | -1.4 | 3.9 |
| Share-based compensation expense | 2.6 | 2.0 | 1.8 | 5.5 | 1.7 | 1.7 | 0.8 | 3.1 |
| Loss on extinguishment of debt | | | | 18.8 | | 18.8 | | |
| Other operating | 0.3 | 0.3 | 0.3 | 0.1 | | | | |
| Changes in operating assets and liabilities, net of effects of acquisition (as applicable): | | | | | | | | |
| Accounts receivable, net | -4.8 | 0.7 | 47.1 | -52.5 | -12.4 | -28.1 | 18.5 | -44.9 |
| Inventory | 0.3 | 10.4 | 4.5 | -57.1 | -22.8 | -22.9 | -28.6 | -35.1 |
| Other current assets | 2.5 | -7.1 | -5.5 | 6.3 | 2.4 | 1.4 | -1.4 | -5.8 |
| Accounts payable | 4.3 | -0.3 | -13.4 | 4.0 | -8.3 | 9.8 | -6.8 | 9.2 |
| Accrued expenses and other current liabilities | -1.1 | 5.1 | -21.6 | 14.3 | -3.5 | 14.4 | 10.3 | 9.4 |
| Other assets and liabilities | | 0.0 | 2.3 | -8.6 | | | | |
| Net cash provided by operating activities | 27.0 | 48.1 | 73.5 | 53.8 | 56.1 | 72.0 | 69.7 | 55.4 |
| |
| Cash flows from investing activities: | | | | | | | | |
| Purchase of property and equipment | 0.0 | -0.1 | -0.6 | -0.1 | 0.0 | -0.1 | 0.0 | -0.9 |
| Purchase of intangible assets | -0.5 | | | | | | | |
| Purchase of software | -0.8 | -0.5 | -0.4 | -1.6 | -0.4 | -0.4 | -0.9 | |
| Net cash used in investing activities | -1.4 | -0.6 | -1.0 | -0.8 | -0.5 | -0.5 | -0.9 | -5.3 |
| |
| Cash flows from financing activities: | | | | | | | | |
| Proceeds from exercise of stock options | 1.6 | 2.5 | 1.1 | 0.8 | 0.7 | | | |
| Payments for shares withheld and retired for taxes and exercise price for stock-settled share appreciation rights | | -0.1 | -0.2 | -0.6 | | -0.6 | | |
| Payment to pre-IPO stockholders pursuant to tax receivable agreement | -16.5 | | | | | | | |
| Principal payments for 2022 Term Loan Facility, and principal payments and prepayment fees for 2020 Term Loan Facility | -1.7 | -3.4 | 0.0 | -780.4 | -1.7 | -777.0 | -5.0 | -15.1 |
| Proceeds from the issuance of 2022 Term Loan Facility | | | | 675.0 | | 675.0 | | |
| Payments of debt issuance costs | | | | -11.9 | | -11.9 | | |
| Net cash used in financing activities | -16.6 | -0.9 | 0.9 | -1.6 | -0.9 | -114.5 | -3.9 | -5.0 |
| Net increase in cash and cash equivalents | 55.6 | | | | 11.6 | | | |
| |
| Supplemental disclosure of cash flow information: | | | | | | | | |
| Cash paid for income taxes | 9.4 | 0.1 | 5.0 | 54.9 | 35.2 | 0.0 | 17.7 | 16.1 |
| Cash paid during the year for interest | 15.5 | 13.9 | 19.5 | 21.7 | 2.9 | 10.6 | 14.3 | 44.0 |
| Supplemental disclosure of noncash activities: | | | | | | | | |
| Cash-settled units liability reclassification to additional paid in capital | | | | | | 1.6 | | |