| 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 |
| Net income | 5.6 | 77.8 | 32.2 | 61.3 | 37.7 | 37.7 | 30.5 | 9.8 |
| Depreciation and amortization | 86.9 | 73.0 | 61.1 | 53.6 | 51.4 | 51.4 | 51.5 | 58.4 |
| Stock-based compensation | 68.2 | 53.2 | 44.7 | 34.0 | 28.9 | 28.9 | 21.9 | 19.5 |
| Deferred taxes | -37.3 | -3.3 | -6.5 | -1.3 | -5.7 | -5.7 | -31.4 | -5.1 |
| Change in working capital [+] | 6.7 | -4.9 | 55.0 | -13.0 | -2.0 | 8.9 | -42.1 | -21.1 |
| Accounts receivable | | -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 |
| Other current assets | 6.4 | 2.8 | -6.4 | -2.0 | 1.2 | 1.2 | -2.1 | -1.1 |
| Accounts payable | -7.8 | 29.1 | -6.3 | 7.9 | -9.2 | -9.2 | 19.7 | -5.0 |
| Accrued expenses | 19.1 | 34.9 | 4.4 | 3.0 | 8.2 | 22.6 | 4.4 | -3.3 |
| Deferred revenues | 24.5 | | | | | 3.0 | | |
| Other | -5.4 | -5.0 | 14.1 | 7.7 | 10.8 | -2.0 | 3.3 | -18.3 |
| Other operating activities | -52.4 | 36.0 | -0.5 | 10.4 | -6.3 | -17.2 | -5.6 | -11.5 |
| Cash from operations | 77.8 | 231.8 | 185.9 | 145.0 | 104.0 | 104.0 | 24.8 | 49.9 |
| |
| Capital expenditures | -47.5 | -29.0 | -22.8 | -15.9 | -23.7 | -23.7 | -15.3 | -13.4 |
| Purchases of property and equipment | -47.5 | -29.0 | -22.8 | -15.9 | -23.7 | -23.7 | -15.3 | -13.4 |
| Purchases of intangible assets | | | | | | | -0.2 | -1.4 |
| Acquisitions | -3.4 | -354.2 | -225.0 | | | | -4.4 | -312.2 |
| Other cash from investing | -7.7 | -29.4 | -32.0 | -45.8 | -30.7 | -30.7 | -15.0 | -14.3 |
| Cash from investing | -58.7 | -412.5 | -279.9 | -61.7 | -54.4 | -54.4 | -35.0 | -341.3 |
| |
| Repurchase of common stock, net | -52.2 | | -53.0 | 37.8 | 39.6 | | 13.9 | |
| Option exercises | | 67.3 | 54.3 | 40.7 | 30.6 | | 30.1 | 17.7 |
| Other cash from financing | 31.3 | 114.7 | 563.6 | -20.6 | -22.6 | -13.6 | 6.3 | 281.4 |
| Cash from financing | -21.0 | 47.4 | 456.3 | -23.5 | -13.6 | -13.6 | -9.9 | 263.8 |
| |
| Free cash flow | 30.2 | 202.8 | 163.0 | 129.1 | 80.3 | 80.3 | 9.5 | 36.5 |
| Per share (diluted) | $0.66 | $4.23 | $3.73 | $3.01 | $1.98 | $1.98 | $0.25 | $0.99 |
| |
| Cash paid for interest | | 1.9 | 0.5 | 3.6 | 7.5 | | 6.6 | 5.3 |
| Cash paid for income taxes | | -1.7 | 10.3 | 7.8 | 3.5 | | 7.8 | 11.1 |