| In millions, except per share items | Dec-31-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 | Dec-31-20 |
| | 8-K | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K |
| Net income | -0.2 | 27.7 | 120.8 | -57.9 | -36.5 | 12.9 | 17.4 | 17.0 |
| Depreciation and amortization | | 25.3 | 27.3 | 26.0 | 26.8 | 27.2 | 28.0 | 27.4 |
| Stock-based compensation | | 47.1 | 47.8 | 43.9 | 49.0 | 54.8 | 49.5 | 47.6 |
| Deferred taxes | | -1.3 | 4.8 | -3.6 | -13.2 | -2.1 | 3.3 | -35.8 |
| Change in working capital [+] | | -45.8 | -138.1 | 6.1 | 68.7 | -8.8 | 6.7 | -55.6 |
| Accounts receivable | | -37.7 | -54.8 | 0.1 | 48.1 | -22.9 | 40.3 | -26.1 |
| Inventories | | -2.6 | 1.1 | -15.9 | -25.5 | 12.8 | -6.4 | 12.2 |
| Other current assets | | -4.0 | -8.0 | 2.7 | -7.3 | -8.5 | 42.8 | -14.5 |
| Other | | -1.5 | -76.4 | 19.2 | 53.4 | 9.7 | -70.0 | -27.1 |
| Other operating activities | | 3.3 | -108.1 | -3.3 | 2.2 | -1.3 | 8.7 | -14.0 |
| Cash from operations | | 56.2 | -45.4 | 11.2 | 97.1 | 82.8 | 113.5 | -13.4 |
| |
| Capital expenditures | | -27.2 | -28.8 | -28.7 | -18.7 | -22.6 | -25.5 | -31.0 |
| Purchases of property and equipment | | -27.2 | -28.8 | -28.7 | -18.7 | -22.6 | -25.5 | -31.0 |
| Purchases of intangible assets | | -0.9 | -1.9 | -15.6 | -1.6 | -3.7 | -2.7 | -8.8 |
| Purchases of short-term investments | | 147.4 | -147.4 | 737.1 | -252.6 | 237.2 | -237.2 | 369.9 |
| Purchases of short-term investments | | 147.4 | -147.4 | 737.1 | -252.6 | 237.2 | -237.2 | 369.9 |
| Other cash from investing | | -149.0 | 265.8 | -748.2 | 153.1 | -331.2 | 194.6 | -319.1 |
| Cash from investing | | -29.7 | 87.8 | -55.4 | -119.8 | -120.3 | -70.8 | 11.0 |
| |
| Option exercises | | 21.3 | 8.2 | 16.3 | 5.2 | 21.8 | 5.8 | 11.6 |
| Other cash from financing | | 9.5 | -17.0 | 30.7 | 4.2 | 32.8 | -18.5 | -354.5 |
| Cash from financing | | -11.8 | -25.3 | 14.4 | -1.0 | 11.0 | -24.4 | -366.2 |
| |
| Free cash flow | | 29.1 | -74.2 | -17.6 | 78.3 | 60.2 | 88.0 | -44.4 |
| Per share (diluted) | | $0.16 | ($0.38) | ($0.10) | $0.43 | $0.32 | $0.48 | ($0.23) |
| |
| Cash paid for interest | | 3.7 | 1.4 | 3.7 | 1.5 | 3.7 | 1.5 | 6.6 |