| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | 146.3 | 139.6 | 73.9 | 90.7 | 39.3 | 15.1 | 12.6 | 8.7 |
| Depreciation and amortization [+] | 18.7 | 15.7 | 15.8 | 15.9 | 7.1 | 2.8 | 1.7 | 1.4 |
| Depreciation | 8.7 | 5.7 | 5.0 | 5.0 | 3.6 | 1.9 | 1.3 | 1.1 |
| Amortization of intangible assets | 10.0 | 10.1 | 10.8 | 10.9 | 3.5 | 1.0 | 0.4 | 0.3 |
| Asset impairment charges | 1.8 | 0.1 | 0.4 | 0.2 | | | | |
| Stock-based compensation | 11.9 | 10.6 | 8.0 | 21.7 | 4.0 | 1.9 | 1.0 | 0.6 |
| Tax benefit from stock-based compensation | | | | | -0.2 | -0.3 | -0.2 | |
| Deferred taxes | -5.7 | 4.6 | -9.4 | 9.1 | 2.7 | 5.1 | -1.4 | -0.4 |
| Change in working capital | 45.4 | 2.6 | 3.8 | -17.3 | 1.0 | -1.5 | 1.0 | 0.1 |
| Other | 45.4 | 2.6 | 3.8 | -17.3 | 1.0 | -1.5 | 1.0 | 0.1 |
| Other operating activities | -25.7 | 20.3 | 15.1 | -16.3 | -3.5 | 3.4 | -3.8 | 5.8 |
| Cash from operations | 192.7 | 193.5 | 107.7 | 104.0 | 50.4 | 26.7 | 10.9 | 16.2 |
| |
| Capital expenditures [+] | -4.6 | -13.6 | -2.9 | -7.7 | -5.0 | -40.6 | -1.1 | -2.4 |
| Purchases of property and equipment | -4.6 | -13.6 | -2.9 | -7.7 | -5.0 | -40.6 | -1.1 | -2.4 |
| Sales of property and equipment | | 14.6 | 2.2 | | | | | |
| Purchases of intangible assets | | | | | | -4.2 | | |
| Acquisitions | | -55.5 | | 112.7 | | | | |
| Purchases of short-term investments, net | -348.9 | 5.1 | -27.5 | -45.8 | -38.7 | 93.6 | -29.4 | -27.0 |
| Purchases of short-term investments | -452.6 | -201.4 | -1,175.1 | -745.3 | -811.1 | -840.0 | -357.2 | -344.8 |
| Sales of short-term investments | 103.7 | 206.5 | 1,147.6 | 699.5 | 772.4 | 933.6 | 327.8 | 317.8 |
| Other cash from investing | -2,045.8 | -767.0 | -846.3 | -105.6 | -356.3 | -173.7 | -172.8 | -116.6 |
| Cash from investing | -2,399.4 | -816.4 | -874.6 | -46.3 | -400.0 | -124.9 | -203.3 | -146.0 |
| |
| Cash dividends paid | -42.3 | -36.5 | -34.1 | -26.8 | | | | |
| Issuance of common stock, net | 154.4 | -15.5 | -57.5 | -94.5 | | 56.7 | 94.5 | |
| Option exercises | 1.2 | 6.3 | 4.3 | 4.1 | 0.5 | 0.2 | | 0.2 |
| Other cash from financing | 2,152.0 | 830.2 | 842.0 | 235.0 | 285.5 | -44.1 | 261.2 | 108.3 |
| Cash from financing | 2,262.9 | 771.9 | 746.2 | 109.5 | 285.0 | 12.4 | 355.7 | 108.1 |
| |
| Free cash flow | 188.1 | 179.9 | 104.8 | 96.3 | 45.4 | -13.9 | 9.8 | 13.8 |
| Per share (diluted) | $3.54 | $3.64 | $2.10 | $1.81 | $1.88 | ($0.76) | $0.90 | $1.37 |
| |
| Cash paid for interest | 77.3 | 37.1 | 58.2 | 88.2 | 29.2 | 10.7 | | |