| In millions, except per share items | Jun-30-23 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 | Dec-31-20 |
| | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K |
| Net sales | 685.1 | 723.6 | 662.6 | 576.6 | 622.2 | 590.7 | 566.6 | 527.8 |
| Net sales growth | -5.3% | 22.5% | 16.9% | 9.2% | 21.3% | 43.8% | 1.3% | -1.2% |
| Cost of goods sold | 489.5 | 566.2 | 507.4 | 469.8 | 484.0 | 449.7 | 404.9 | 377.0 |
| Gross profit | 195.6 | 157.5 | 155.2 | 106.7 | 138.2 | 141.0 | 161.8 | 150.8 |
| Gross margin | 28.6% | 21.8% | 23.4% | 18.5% | 22.2% | 23.9% | 28.5% | 28.6% |
| Selling, general, and administrative expenses | 37.4 | 38.5 | 35.6 | 34.6 | 39.7 | 34.7 | 36.9 | 37.0 |
| Research, development, and testing expenses | 34.0 | 35.4 | 36.3 | 36.7 | 35.4 | 35.5 | 36.3 | 38.2 |
| Operating profit | 124.2 | 83.6 | 83.3 | 35.4 | 63.1 | 70.7 | 88.5 | 75.6 |
| Operating margin | 18.1% | 11.6% | 12.6% | 6.1% | 10.1% | 12.0% | 15.6% | 14.3% |
| Interest and financing expenses, net | -10.3 | -7.1 | -9.4 | -9.7 | -9.3 | -8.9 | -6.3 | -5.8 |
| Loss on early extinguishment of debt | | | 7.5 | | | | | |
| Other income (expense), net | 10.7 | 9.1 | 7.2 | 4.2 | 7.4 | 5.2 | 7.2 | 6.5 |
| Income before income tax expense | 124.7 | 85.6 | 73.5 | 30.0 | 61.2 | 67.1 | 89.4 | 76.3 |
| Income tax expense | 25.1 | 19.1 | 14.2 | 12.8 | 9.1 | 15.1 | 19.7 | 9.4 |
| Net income | 99.6 | 66.5 | 59.3 | 17.2 | 52.0 | 52.0 | 69.7 | 66.9 |
| |
| Earnings per share - basic (in dollars per share) | $10.36 | $6.54 | $5.75 | $1.77 | $4.80 | $4.75 | $6.38 | $6.12 |
| Earnings per share - diluted (in dollars per share) | $10.36 | $6.54 | $5.75 | $1.77 | $4.80 | $4.75 | $6.38 | $6.12 |
| |
| Cash dividends declared per share (in dollars per share) | $2.25 | $2.10 | $2.10 | $2.10 | $2.10 | $1.90 | $1.90 | $1.90 |