| 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 |
| Assets | | | | | | | | |
| Current assets: | | | | | | | | |
| Cash and cash equivalents | 210.3 | 213.3 | 220.6 | 51.0 | 104.3 | 55.0 | 145.7 | 173.2 |
| Accounts receivable, net of allowances of $608 and $610 at June 30, 2022 and December 31, 2021, respectively | 78.3 | 74.3 | 83.0 | 62.2 | 64.7 | 65.7 | 82.3 | 49.7 |
| Contract assets, current (net of allowance) | 46.9 | 61.5 | 67.5 | 68.5 | 63.0 | 61.6 | 62.5 | 69.8 |
| Deferred commissions, current | 11.5 | 10.8 | 10.5 | 8.0 | 7.7 | 6.8 | 6.6 | 5.8 |
| Prepaid expenses | 19.9 | 21.1 | 16.7 | 18.2 | 14.1 | 15.3 | 17.6 | 17.7 |
| Other current assets | 3.0 | 2.1 | 2.9 | 2.8 | 2.2 | 1.8 | 1.9 | 1.1 |
| Total current assets | 369.9 | 383.0 | 401.1 | 210.8 | 256.0 | 206.2 | 316.7 | 317.2 |
| |
| Noncurrent assets: | | | | | | | | |
| Property and equipment, net | 8.8 | 9.0 | 9.4 | 8.3 | 8.8 | 9.1 | 9.4 | 9.6 |
| Goodwill | 526.0 | 527.9 | 528.5 | 529.6 | 473.7 | 441.4 | 441.2 | 418.7 |
| Intangible assets, net | 176.1 | 183.3 | 190.1 | 196.0 | 179.3 | 175.5 | 180.4 | 177.4 |
| Contract assets, noncurrent (net of allowance) | 5.7 | 5.6 | 3.5 | 4.2 | 5.2 | 8.1 | 11.3 | 14.2 |
| Deferred commissions, noncurrent | 20.6 | 19.4 | 19.4 | 13.7 | 11.8 | 9.7 | 9.3 | 8.2 |
| Deferred income taxes, net | 4.2 | 3.1 | 6.2 | 3.9 | 3.4 | 4.0 | 4.0 | 2.7 |
| Operating lease right-of-use assets | 11.8 | 12.9 | 13.7 | 13.2 | 14.1 | 14.8 | 15.6 | 15.1 |
| Other noncurrent assets | 8.8 | 9.0 | 6.1 | 4.7 | 2.9 | 3.3 | 2.5 | 2.5 |
| |
| Total noncurrent assets | | | | | | | | |
| Total assets | 1,132.0 | 1,153.1 | 1,178.0 | 984.4 | 955.1 | 872.1 | 990.5 | 965.6 |
| |
| Liabilities and stockholders' equity | | | | | | | | |
| Current liabilities: | | | | | | | | |
| Accounts payable | 4.9 | 9.7 | 4.5 | 1.7 | 2.9 | 0.6 | 2.8 | 0.7 |
| Accrued expenses and other current liabilities | 20.2 | 16.8 | 29.3 | 19.3 | 20.2 | 12.9 | 17.2 | 10.4 |
| Accrued compensation | 20.2 | 16.8 | 29.3 | 19.3 | 20.2 | 12.9 | 17.2 | 10.4 |
| Deferred revenue, current | 81.2 | 70.4 | 72.0 | 45.5 | 43.4 | 46.0 | 49.2 | 35.6 |
| Operating lease liabilities, current | 4.3 | 4.4 | 4.3 | 4.1 | 4.1 | 4.1 | 4.0 | 3.8 |
| Current portion of long-term debt (net of issuance costs) | 1.9 | 1.9 | 1.1 | | | | | |
| Total current liabilities | 122.9 | 113.0 | 121.5 | 81.7 | 78.4 | 71.6 | 80.5 | 57.4 |
| |
| Noncurrent liabilities: | | | | | | | | |
| Deferred revenue, noncurrent | 3.9 | 4.3 | 5.6 | 4.2 | 4.3 | 3.4 | 3.2 | 2.4 |
| Long-term debt (net of issuance costs) | 290.2 | 290.7 | 291.2 | 119.2 | 119.1 | 39.1 | 149.0 | 149.0 |
| Deferred income taxes, net | 1.9 | 0.8 | 4.2 | 6.8 | 9.6 | 14.3 | 17.9 | 19.7 |
| Operating lease liabilities, noncurrent | 11.7 | 13.1 | 14.1 | 14.1 | 15.2 | 16.2 | 17.2 | 17.0 |
| Total noncurrent liabilities | 307.8 | 308.8 | 315.1 | 145.9 | 149.8 | 74.5 | 188.9 | 190.6 |
| Total liabilities | 430.7 | 421.8 | 436.6 | 227.6 | 228.2 | 146.1 | 269.3 | 248.0 |
| |
| Commitments and contingencies (Note 15) | | | | | | | | |
| Stockholders' equity: | | | | | | | | |
| Preferred stock; $0.001 par value; 50,000,000 shares authorized at June 30, 2022 and December 31, 2021; no shares issued or outstanding at June 30, 2022 or December 31, 2021 | | | | | | | | |
| Common stock; $0.001 par value; 500 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Additional paid-in capital | 856.0 | 835.5 | 824.5 | 813.9 | 771.3 | 759.6 | 739.1 | 733.8 |
| Accumulated other comprehensive income (loss) | -2.8 | -0.2 | 0.7 | 0.7 | 1.8 | 1.6 | 1.4 | -0.6 |
| Accumulated deficit | -151.9 | -104.0 | -83.8 | -57.8 | -46.3 | -35.3 | -19.4 | -15.7 |
| Total stockholders' equity | 701.4 | 731.3 | 741.4 | 756.8 | 726.9 | 726.0 | 721.1 | 717.6 |
| Total liabilities and stockholders' equity | 1,132.0 | 1,153.1 | 1,178.0 | 984.4 | 955.1 | 872.1 | 990.5 | 965.6 |