| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Revenue from Contract with Customer, Excluding Assessed Tax | 137.2 | 159.8 | 151.4 | 157.7 | 173.6 | 176.7 | 180.3 | 180.3 |
| Revenue from Contract with Customer, Excluding Assessed Tax growth | -14.1% | 5.5% | -4.0% | -9.1% | -1.8% | -2.0% | 0.0% | -5.2% |
| Cost of sales | 33.1 | 34.1 | 35.5 | 31.6 | 34.5 | 35.7 | 36.6 | 34.1 |
| Gross profit | 104.1 | 125.6 | 115.9 | 126.2 | 139.1 | 141.0 | 143.7 | 146.2 |
| Gross margin | 75.9% | 78.6% | 76.5% | 80.0% | 80.1% | 79.8% | 79.7% | 81.1% |
| |
| Operating expenses: | | | | | | | | |
| Commissions and incentives | 55.5 | 63.8 | 61.3 | 64.3 | 73.5 | 74.6 | 74.2 | 73.0 |
| Selling and administrative expenses | 27.5 | 29.4 | 27.8 | 30.8 | 34.2 | 35.5 | 37.2 | 34.5 |
| Depreciation and amortization expense | 1.6 | 1.7 | 2.0 | 2.1 | 2.1 | 1.9 | 1.9 | 1.8 |
| Other operating costs | 20.0 | 21.6 | 20.2 | 22.6 | 29.4 | 26.6 | 29.7 | 24.8 |
| Total operating expenses | 104.6 | 116.6 | 111.4 | 119.7 | 139.2 | 138.5 | 143.1 | 134.0 |
| (Loss) income from operations | -0.4 | 9.0 | 4.5 | 6.4 | -0.1 | 2.5 | 0.7 | 12.1 |
| Operating margin | -0.3% | 5.7% | 3.0% | 4.1% | -0.1% | 1.4% | 0.4% | 6.7% |
| Interest (expense) income, net | 0.1 | 0.1 | 0.1 | 0.0 | 0.3 | 0.3 | 0.2 | 0.2 |
| Other income (expense), net | -0.2 | -0.2 | 1.2 | -0.7 | 0.3 | -0.3 | -1.8 | -4.2 |
| (Loss) income before income taxes | -0.5 | 8.9 | 5.7 | 5.7 | 0.5 | 2.5 | -1.0 | 8.2 |
| Income tax provision | -4.0 | 1.0 | 0.5 | -2.4 | -4.4 | -4.2 | 0.4 | -2.4 |
| Tax rate | | | | 42.7% | 894.7% | 172.6% | 38.6% | 28.8% |
| Net (loss) income | -4.5 | 9.8 | 6.3 | 3.3 | -3.9 | -1.8 | -0.6 | 5.8 |
| |
| (Loss) income per common share: | | | | | | | | |
| Basic (in dollars per share) | ($2.35) | $4.95 | $2.80 | $1.38 | ($1.53) | ($0.66) | ($0.22) | $2.18 |
| Diluted (in dollars per share) | ($2.35) | $4.71 | $2.77 | $1.35 | ($1.53) | ($0.66) | ($0.22) | $2.14 |
| |
| Weighted-average common shares outstanding: | | | | | | | | |
| Basic (in shares) | 1.9 | 2.0 | 2.2 | 2.4 | 2.5 | 2.7 | 2.7 | 2.7 |
| Diluted (in shares) | 1.9 | 2.1 | 2.3 | 2.4 | 2.5 | 2.7 | 2.7 | 2.7 |