| In millions, except per share items | Jun-30-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 |
| | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q |
| Revenue from Contract with Customer, Excluding Assessed Tax | | 137.2 | 142.4 | 146.3 | 153.8 | 159.8 | 159.5 | 158.0 |
| Revenue from Contract with Customer, Excluding Assessed Tax growth | | -14.1% | -10.7% | -7.4% | 0.5% | 5.5% | 5.2% | 3.1% |
| Cost of sales | | 33.1 | 31.3 | 31.8 | 34.0 | 34.1 | 35.7 | 37.1 |
| Gross profit | | 104.1 | 111.0 | 114.5 | 119.8 | 125.6 | 123.7 | 120.8 |
| Gross margin | | 75.9% | 78.0% | 78.3% | 77.9% | 78.6% | 77.6% | 76.5% |
| |
| Operating expenses: | | | | | | | | |
| Commissions and incentives | | 55.5 | 57.0 | 58.5 | 61.3 | 63.8 | 64.3 | 63.6 |
| Selling and administrative expenses | | 27.5 | 28.1 | 28.6 | 29.2 | 29.4 | 21.8 | 21.3 |
| Depreciation and amortization expense | | 1.6 | 1.7 | 1.4 | 1.5 | 1.7 | 1.4 | 1.4 |
| Other operating costs | | 20.0 | 21.0 | 20.9 | 21.5 | 21.6 | 20.5 | 20.6 |
| Total operating expenses | | 104.6 | 107.8 | 109.4 | 113.5 | 116.6 | 99.2 | 98.2 |
| (Loss) income from operations | | -0.4 | 3.2 | 5.1 | 6.3 | 9.0 | 8.1 | 6.2 |
| Operating margin | | -0.3% | 2.2% | 3.5% | 4.1% | 5.7% | 5.1% | 3.9% |
| Interest (expense) income, net | | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.0 |
| Other income (expense), net | | -0.2 | 0.2 | -0.1 | 0.1 | -0.2 | -0.1 | 0.1 |
| (Loss) income before income taxes | | -0.5 | 3.5 | 5.1 | 6.5 | 8.9 | 8.0 | 6.3 |
| Income tax provision | | -4.0 | 1.1 | 1.2 | 1.3 | 1.0 | -1.0 | -0.6 |
| Tax rate | | | -31.9% | -24.1% | -19.8% | | 11.9% | 9.8% |
| Net (loss) income | | -4.5 | 4.6 | 6.3 | 7.8 | 9.8 | 8.0 | 6.7 |
| |
| (Loss) income per common share: | | | | | | | | |
| Basic (in dollars per share) | | ($2.35) | $2.37 | $3.29 | $3.96 | $4.95 | $3.98 | $3.21 |
| Diluted (in dollars per share) | | ($2.35) | $2.25 | $3.08 | $3.73 | $4.71 | $3.81 | $3.13 |
| |
| Weighted-average common shares outstanding: | | | | | | | | |
| Basic (in shares) | | 1.9 | 1.9 | 1.9 | 2.0 | 2.0 | 2.0 | 2.1 |
| Diluted (in shares) | | 2.0 | 2.0 | 2.1 | 2.1 | 2.1 | 2.1 | 2.1 |