| In millions, except per share items | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 | Dec-31-20 | Sep-30-20 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Revenue: | | | | | | | | |
| Revenue | 542.3 | 469.2 | 497.6 | 477.4 | 475.5 | 417.8 | 439.4 | 419.2 |
| Revenue growth | 14.0% | 12.3% | 13.2% | 13.9% | 15.6% | -8.7% | -19.5% | -14.3% |
| Operating expenses: | | | | | | | | |
| Operating expenses | | | | | | | | |
| Selling, general and administrative expense | 108.3 | 108.4 | 104.2 | 100.9 | 101.6 | 94.4 | 88.9 | 91.8 |
| Restructuring expense | 0.8 | 0.5 | 2.5 | 1.1 | 1.0 | 1.0 | 0.9 | 7.1 |
| Operating income | 42.2 | 30.6 | 34.5 | 40.5 | 47.3 | 37.8 | 43.5 | 28.3 |
| Operating margin | 7.8% | 6.5% | 6.9% | 8.5% | 9.9% | 9.0% | 9.9% | 6.8% |
| |
| Pension (income) expense, other than service cost | | | | | | | | |
| Net income before income taxes | 39.7 | 28.5 | 33.5 | 38.3 | 45.2 | 35.7 | 40.2 | 24.3 |
| Income tax provision | 6.3 | 2.9 | 1.9 | 9.0 | 14.7 | 8.7 | 10.1 | 7.1 |
| Net income | 33.4 | 25.6 | 31.6 | 29.3 | 30.5 | 27.0 | 30.1 | 17.2 |
| |
| Basic earnings per share: | | | | | | | | |
| Net income (in Dollars per share) | $1.05 | $0.80 | $0.99 | $0.91 | $0.95 | $0.84 | $0.94 | $0.54 |
| |
| Diluted earnings per share: | | | | | | | | |
| Net income (in Dollars per share) | $1.04 | $0.80 | $0.98 | $0.91 | $0.95 | $0.84 | $0.94 | $0.54 |
| |
| Weighted average shares outstanding: | | | | | | | | |
| Basic (in Shares) | 32.0 | 32.0 | 32.0 | 32.0 | 32.0 | 32.0 | 32.0 | 32.0 |
| Diluted (in Shares) | 32.1 | 32.1 | 32.1 | 32.1 | 32.1 | 32.1 | 32.1 | 32.1 |