| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 |
| | 10-K | 10-K | 10-K |
| Revenue | 889.1 | 491.8 | 299.3 |
| Revenue growth | 80.8% | 64.3% | |
| Operating costs and expenses: | | | |
| Cost of revenue, exclusive of depreciation and amortization shown separately below | 440.8 | 256.1 | 164.5 |
| Operations and support | 187.0 | 116.2 | 78.8 |
| Technology and development | 48.7 | 27.0 | 16.9 |
| Sales and marketing | 187.9 | 80.0 | 70.6 |
| General and administrative | 88.8 | 57.6 | 36.3 |
| Depreciation | 17.1 | 15.5 | 5.7 |
| Amortization of intangible assets | 44.2 | 18.8 | 8.0 |
| Total operating costs and expenses | 1,014.5 | 571.2 | 380.7 |
| Loss from operations | -125.4 | -79.4 | -81.5 |
| Operating margin | -14.1% | -16.1% | -27.2% |
| Interest income | 0.0 | 0.4 | 1.1 |
| Interest expense | -31.7 | -7.9 | -1.2 |
| Other income, net | 3.3 | -5.7 | -3.4 |
| Income (loss) before income taxes | -153.8 | -92.7 | -84.9 |
| Income tax expense | -0.8 | 0.3 | 0.1 |
| Net income (loss) | -154.6 | -92.3 | -84.9 |
| |
| Less: Net income (loss) attributable to redeemable noncontrolling interests | | | |
| Net income (loss) attributable to Class A Common Stockholders, basic | -12.7 | | |
| |
| Net income (loss) per share of Class A Common Stock, basic (in usd per share) | ($0.06) | | |
| Net income (loss) per share of Class A Common Stock, diluted (in usd per share) | ($0.06) | | |
| |
| Weighted-average shares of Class A Common Stock used to compute net income | 214.8 | 0.2 | 0.2 |
| Weighted-average shares of Class A Common Stock used to compute net income | 214.8 | 0.2 | 0.2 |