| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-05-18 | Dec-31-17 | Dec-31-16 |
| | 8-K | 10-K | 10-K | 10-K | 10-K | 8-K | 10-K | 10-K |
| Operating Activities | | | | | | | | |
| Net income (loss) | 5.6 | 77.8 | 32.2 | 61.3 | 37.7 | 37.7 | 30.5 | 9.8 |
| |
| Adjustments to reconcile net income (loss) to net cash from (used in) operating activities: | | | | | | | | |
| Depreciation and amortization | 86.9 | 73.0 | 61.1 | 53.6 | 51.4 | 51.4 | 51.5 | 58.4 |
| Loss on disposal of property and equipment | | 0.4 | 0.3 | 0.4 | 0.1 | | 0.5 | 0.0 |
| Share-based compensation expense | 68.2 | 53.2 | 44.7 | 34.0 | 28.9 | 28.9 | 21.9 | 19.5 |
| Deferred income taxes | -37.3 | -3.3 | -6.5 | -1.3 | -5.7 | -5.7 | -31.4 | -5.1 |
| Amortization of operating lease right-of-use assets | | 11.9 | 10.5 | 10.6 | | | | |
| Amortization of debt issuance costs | 4.2 | 3.4 | 1.6 | 2.2 | 2.3 | 2.3 | 1.6 | 1.6 |
| Changes in operating assets and liabilities: | | | | | | | | |
| Accounts receivable and unbilled receivables | | -41.0 | 36.8 | -21.5 | -6.2 | | -40.6 | 9.9 |
| Inventories | -30.1 | -25.7 | 12.4 | -8.1 | -6.8 | -6.8 | -26.8 | -3.4 |
| Prepaid expenses | -4.7 | -5.7 | -2.1 | 2.9 | -0.3 | -0.3 | -4.9 | -0.4 |
| Other current assets | 6.4 | 2.8 | -6.4 | -2.0 | 1.2 | 1.2 | -2.1 | -1.1 |
| Investment in sales-type leases | | 3.3 | -2.9 | -3.7 | -1.7 | | 6.6 | -9.6 |
| Prepaid commissions | | -6.9 | -8.1 | -2.7 | -4.7 | | -4.0 | -7.2 |
| Other long-term assets | 5.0 | -3.3 | -7.7 | 4.5 | -7.1 | -7.1 | -1.4 | -5.1 |
| Accounts payable | -7.8 | 29.1 | -6.3 | 7.9 | -9.2 | -9.2 | 19.7 | -5.0 |
| Accrued compensation | | 12.3 | 11.6 | 2.5 | 14.4 | | 0.5 | -2.1 |
| Accrued liabilities | 19.1 | 34.9 | 4.4 | 3.0 | 8.2 | 22.6 | 4.4 | -3.3 |
| Deferred revenues | | 24.2 | 7.6 | 5.4 | 3.0 | | -2.3 | -1.9 |
| Operating lease liabilities | | -12.5 | -9.5 | -10.0 | | | | |
| Other long-term liabilities | -0.7 | -14.9 | 7.5 | 6.0 | -1.7 | -1.7 | 1.1 | -6.3 |
| Net cash provided by (used in) operating activities | 77.8 | 231.8 | 185.9 | 145.0 | 104.0 | 104.0 | 24.8 | 49.9 |
| |
| Investing Activities | | | | | | | | |
| Purchases of property and equipment | | -29.0 | -22.8 | -15.9 | -23.7 | | -15.3 | -13.4 |
| Business acquisition, net of cash acquired | -3.4 | -354.2 | -225.0 | | | | -4.4 | -312.2 |
| Net cash used in investing activities | -58.7 | -412.5 | -279.9 | -61.7 | -54.4 | -54.4 | -35.0 | -341.3 |
| |
| Financing Activities | | | | | | | | |
| Proceeds from issuances under stock-based compensation plans | | 67.3 | 54.3 | 40.7 | 30.6 | | 30.1 | 17.7 |
| Employees’ taxes paid related to restricted stock units | | -16.3 | -8.7 | -9.7 | -6.8 | | -5.9 | -3.5 |
| Stock repurchases | -52.2 | | -53.0 | | | | | |
| Net cash provided by (used in) financing activities | -21.0 | 47.4 | 456.3 | -23.5 | -13.6 | -13.6 | -9.9 | 263.8 |
| Net increase (decrease) in cash, cash equivalents, and restricted cash | | -134.3 | 362.7 | 60.0 | | | | |
| |
| Reconciliation of cash, cash equivalents, and restricted cash to the Condensed Consolidated Balance Sheets: | | | | | | | | |
| Cash and cash equivalents | | | | | | | | |
| Restricted cash included in other current assets | | | | | | | | |
| Supplemental disclosure of non-cash investing activities | | | | | | | | |
| Unpaid purchases of property and equipment | | 0.9 | 0.4 | 0.9 | 1.1 | | 1.7 | 0.2 |
| Transfers between inventory and property and equipment, net | | 1.9 | | 1.6 | 2.0 | | | |