| 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 | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Revenue: | | | | | | | | |
| Total revenue | 575.1 | 598.7 | 603.5 | 589.0 | 565.1 | 515.6 | 467.7 | 409.4 |
| Total revenue growth | 1.8% | 16.1% | 29.0% | 43.9% | 53.4% | 60.7% | 55.9% | 34.1% |
| Cost of revenue: | | | | | | | | |
| Cost of Revenue | 216.6 | 238.6 | 254.8 | 256.3 | 247.1 | 221.8 | 194.2 | 163.2 |
| Gross profit | 358.5 | 360.1 | 348.7 | 332.7 | 318.0 | 293.8 | 273.5 | 246.2 |
| Gross margin | 62.3% | 60.1% | 57.8% | 56.5% | 56.3% | 57.0% | 58.5% | 60.1% |
| |
| Operating expenses: | | | | | | | | |
| Marketing | 61.0 | 62.7 | 63.1 | 66.8 | 69.0 | 65.1 | 62.7 | 61.4 |
| Operations and technology | 276.2 | 279.9 | 279.0 | 270.1 | 260.4 | 251.0 | 235.8 | 218.9 |
| Selling, general and administrative | 250.2 | 259.6 | 258.5 | 258.0 | 258.2 | 246.5 | 239.5 | 233.0 |
| Restructuring charges | 38.3 | 36.7 | | | 0.3 | | | |
| Total operating expenses | 564.8 | 576.3 | 537.9 | 530.1 | 521.1 | 510.6 | 488.4 | 463.3 |
| Loss from operations | -206.2 | -216.3 | -189.2 | -197.4 | -203.0 | -216.8 | -214.9 | -217.1 |
| Operating margin | -35.9% | -36.1% | -31.3% | -33.5% | -35.9% | -42.1% | -46.0% | -53.0% |
| Interest income | 7.3 | 5.1 | 3.2 | 1.5 | 0.5 | 0.4 | 0.4 | 0.4 |
| Interest expense | -10.5 | -10.5 | -10.5 | -14.2 | -17.6 | -20.9 | -21.5 | -17.8 |
| Other income (expense), net | | | 0.2 | 0.1 | 0.1 | -0.1 | 0.0 | -0.1 |
| Loss before provision for income taxes | -209.4 | -221.3 | -196.3 | -210.0 | -219.9 | -237.5 | -236.1 | -234.5 |
| Provision for income taxes | 0.3 | 0.3 | 0.2 | 0.1 | 0.0 | | 0.1 | 0.1 |
| Net loss attributable to common stockholders | -209.7 | -221.5 | -196.4 | -210.0 | -220.0 | -237.5 | -236.1 | -234.7 |
| |
| Net loss per share attributable to common stockholders, basic | ($2.12) | ($2.27) | ($2.05) | ($2.22) | ($2.35) | ($2.57) | ($2.58) | ($2.60) |
| Net loss per share attributable to common stockholders, diluted | ($2.12) | ($2.27) | ($2.05) | ($2.22) | ($2.35) | ($2.57) | ($2.58) | ($2.60) |
| |
| Shares used to compute net loss per share attributable to common stockholders, basic | 98.3 | 96.8 | 95.2 | 94.1 | 92.9 | 92.0 | 91.1 | 90.1 |
| Shares used to compute net loss per share attributable to common stockholders, diluted | 98.3 | 96.8 | 95.2 | 94.1 | 92.9 | 92.0 | 91.1 | 90.1 |