| 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 | 121.5 | 203.1 | 244.1 | 279.8 | 275.6 | 187.9 | 171.4 | 135.5 |
| 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 | 0.6 | 0.6 | 0.5 | 0.5 | 0.3 | 0.2 | 0.2 | 0.1 |
| Amortization of debt issuance costs | 2.4 | 2.5 | 2.2 | 4.3 | 3.5 | 3.0 | 3.5 | 3.2 |
| Deferred taxes | 10.4 | 8.2 | 5.6 | -9.4 | -1.1 | 0.8 | 4.4 | 4.7 |
| Share-based compensation expense | 11.9 | 11.0 | 10.7 | 9.7 | 7.4 | 5.7 | 4.6 | 4.3 |
| Loss on extinguishment of debt | | | | 37.6 | | 18.8 | | |
| Other operating | 0.9 | 0.7 | 0.4 | 0.1 | | | | |
| Changes in operating assets and liabilities, net of effects of acquisition (as applicable): | | | | | | | | |
| Accounts receivable, net | -9.5 | -17.2 | -46.0 | -74.6 | -67.0 | -54.5 | -46.8 | -59.2 |
| Inventory | -42.0 | -65.0 | -98.3 | -131.4 | -109.4 | -86.6 | -72.6 | -55.7 |
| Other current assets | -3.8 | -3.8 | 4.7 | 8.8 | -3.3 | -5.8 | -9.8 | -7.7 |
| Accounts payable | -5.5 | -18.1 | -7.9 | -1.3 | 3.9 | 12.2 | -3.1 | 14.7 |
| Accrued expenses and other current liabilities | -3.3 | -5.7 | 3.6 | 35.4 | 30.5 | 34.0 | 36.8 | 19.8 |
| Other assets and liabilities | | -6.3 | -6.2 | -8.6 | | | | |
| Net cash provided by operating activities | 202.4 | 231.4 | 255.3 | 251.5 | 253.1 | 197.0 | 166.4 | 141.1 |
| |
| Cash flows from investing activities: | | | | | | | | |
| Purchase of property and equipment | -0.8 | -0.8 | -0.7 | -0.2 | -1.0 | -0.9 | -0.9 | -0.8 |
| Purchase of intangible assets | -0.5 | | | | | | | |
| Purchase of software | -3.4 | -3.0 | -2.9 | -3.4 | -1.8 | -1.3 | -0.9 | |
| Net cash used in investing activities | -3.7 | -2.8 | -2.7 | -2.6 | -7.1 | -6.7 | -6.2 | -5.3 |
| |
| Cash flows from financing activities: | | | | | | | | |
| Proceeds from exercise of stock options | 6.0 | 5.1 | 2.6 | 1.6 | 0.7 | | | |
| Payments for shares withheld and retired for taxes and exercise price for stock-settled share appreciation rights | | -0.8 | -1.3 | -1.1 | | -0.6 | | |
| Principal payments for 2022 Term Loan Facility, and principal payments and prepayment fees for 2020 Term Loan Facility | -785.4 | -785.4 | -1,559.1 | -1,564.1 | -798.8 | -797.1 | -25.1 | -25.1 |
| Proceeds from the issuance of 2022 Term Loan Facility | | | | 1,350.0 | | 675.0 | | |
| Payments of debt issuance costs | | | | -23.9 | | -11.9 | | |
| Net cash used in financing activities | -18.2 | -2.6 | -116.2 | -121.0 | -124.4 | -123.4 | -13.3 | -164.5 |
| |
| Supplemental disclosure of cash flow information: | | | | | | | | |
| Cash paid for income taxes | 69.4 | 95.2 | 95.1 | 107.8 | 69.0 | 33.8 | 33.8 | 25.0 |
| Cash paid during the year for interest | 70.6 | 58.0 | 54.7 | 49.6 | 71.8 | 68.9 | 73.5 | 68.2 |
| Supplemental disclosure of noncash activities: | | | | | | | | |