| 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 | 8-K | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Assets [Abstract] | | | | | | | | |
| Assets, Current [Abstract] | | | | | | | | |
| Cash and cash equivalents | 14.3 | 10.5 | 12.8 | 12.6 | 15.2 | 20.6 | 28.7 | 24.6 |
| Accounts receivable, net of allowances of $1,495 and $1,469 at June 30, 2023 and December 31, 2022 | 79.3 | 80.0 | 74.1 | 83.5 | 82.6 | 89.4 | 71.4 | 84.0 |
| Inventories | 77.4 | 81.8 | 80.7 | 84.2 | 84.7 | 81.2 | 75.0 | 75.3 |
| Income tax receivable | 12.5 | 12.1 | 12.2 | 11.1 | 10.9 | 11.1 | 11.8 | 11.7 |
| Other current assets | 9.2 | 9.0 | 9.1 | 12.8 | 13.3 | 15.0 | 7.2 | 11.8 |
| Total current assets | 197.4 | 200.5 | 191.7 | 204.1 | 206.7 | 217.3 | 196.3 | 207.5 |
| Intangible assets, net | 65.8 | | 72.9 | 78.0 | 81.5 | 85.1 | 88.7 | 92.3 |
| Investment in joint venture | 31.6 | 32.2 | 31.8 | 28.2 | 30.9 | 32.2 | 34.0 | 30.8 |
| Deferred tax assets | 0.1 | 0.1 | 0.1 | 0.4 | 0.4 | 0.3 | 0.3 | 0.1 |
| Other non-current assets | 6.4 | 4.3 | 5.3 | 5.8 | 5.4 | 5.9 | 4.2 | 4.1 |
| Total assets | 538.4 | 547.3 | 546.1 | 557.6 | 573.2 | 595.8 | 579.1 | 594.7 |
| |
| Liabilities and Equity [Abstract] | | | | | | | | |
| Liabilities, Current [Abstract] | | | | | | | | |
| Accounts payable | 51.4 | 50.0 | 45.9 | 45.1 | 47.9 | 48.9 | 36.7 | 44.0 |
| Accrued salaries, wages and benefits | 13.3 | 14.3 | 11.7 | 13.0 | 15.2 | 20.7 | 17.7 | 18.9 |
| Income tax payable | 0.5 | 0.6 | 0.9 | 0.9 | 0.7 | 0.7 | 2.1 | 1.3 |
| Short-term debt and current maturities of long-term debt | 6.8 | | 3.3 | 3.2 | 3.1 | 3.1 | 3.1 | 3.4 |
| Other current liabilities | 13.6 | 15.3 | 11.7 | 11.4 | 12.4 | 13.5 | 8.7 | 12.0 |
| Total current liabilities | 91.0 | 91.3 | 78.8 | 78.6 | 84.4 | 91.8 | 74.0 | 85.1 |
| Deferred tax liabilities | 5.7 | 6.1 | 5.6 | 6.4 | 8.1 | 7.9 | 7.5 | 8.3 |
| Long-term debt, net of current portion | 148.6 | | 149.4 | 154.4 | 151.3 | 150.4 | 151.1 | 151.3 |
| Other non-current liabilities | 18.5 | 10.7 | 10.0 | 10.6 | 13.0 | 14.7 | 17.3 | 21.3 |
| Total liabilities | 313.0 | 305.1 | 295.2 | 301.1 | 307.8 | 316.5 | 301.1 | 318.5 |
| |
| Commitments and contingencies (Note 9) | | | | | | | | |
| Common stock | 0.5 | | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 |
| Additional paid-in capital | 462.5 | 465.4 | 468.1 | 470.5 | 473.0 | 473.1 | 474.8 | 476.5 |
| Accumulated deficit | -269.8 | -255.4 | -245.2 | -233.2 | -231.0 | -222.4 | -219.1 | -219.6 |
| Accumulated other comprehensive loss | -38.8 | -36.0 | -37.1 | -43.0 | -36.2 | -28.1 | -31.9 | -32.6 |
| Total stockholders’ equity | 154.4 | | 186.3 | 194.8 | 206.3 | 223.0 | 224.2 | 224.8 |
| Total liabilities, preferred stock, and stockholders’ equity | 538.4 | | 546.1 | 557.6 | 573.2 | 595.8 | 579.1 | 594.7 |