| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | 72.3 | 58.7 | 82.8 | 66.1 | 61.4 | 62.9 | 62.6 | 35.7 |
| Depreciation and amortization [+] | | | | 62.6 | 42.9 | 41.2 | 44.1 | 47.6 |
| Depreciation | | | | 18.3 | 13.4 | 13.6 | 14.8 | 14.1 |
| Amortization of intangible assets | | | | 44.3 | 29.5 | 27.6 | 29.3 | 33.6 |
| Asset impairment charges | | | | 1.9 | 3.1 | | 1.7 | |
| Stock-based compensation | | | | 19.4 | 21.0 | 22.7 | 21.1 | 16.7 |
| Tax benefit from stock-based compensation | | | | | | -4.7 | -2.2 | -2.1 |
| Deferred taxes | | | | 4.9 | 7.1 | -2.8 | -16.1 | 0.0 |
| Change in working capital [+] | -24.4 | 0.7 | -6.0 | -2.2 | -13.5 | -43.1 | 28.5 | -17.8 |
| Accounts receivable | | | | -0.1 | -6.4 | -23.2 | 1.8 | -14.3 |
| Deferred revenues | | | | | | | 3.8 | -5.6 |
| Income taxes | -8.7 | 6.4 | 4.3 | 5.1 | -2.7 | -14.2 | 9.0 | -2.3 |
| Other | -15.6 | -5.8 | -10.3 | -7.1 | -4.4 | -5.7 | 13.9 | 4.4 |
| Other operating activities | 92.2 | 113.6 | 74.3 | -9.3 | 5.2 | 8.0 | -2.7 | 3.5 |
| Cash from operations | 140.2 | 173.0 | 151.0 | 143.3 | 127.2 | 84.2 | 137.0 | 83.7 |
| |
| Capital expenditures | 26.6 | 29.4 | 37.3 | -57.1 | -28.9 | -14.3 | -18.8 | -26.0 |
| Purchases of property and equipment | 26.6 | 29.4 | 37.3 | -57.1 | -28.9 | -14.3 | -18.8 | -26.0 |
| Purchases of intangible assets | | | | | -12.2 | -7.6 | -8.0 | -5.6 |
| Acquisitions | 63.6 | 11.5 | 17.2 | -144.8 | | | -1.3 | |
| Sales of short-term investments, net [+] | 157.4 | 138.3 | 106.4 | 115.8 | 11.2 | -39.1 | 11.4 | 7.0 |
| Purchases of short-term investments | 67.0 | 81.8 | 54.3 | -75.0 | -182.2 | -197.0 | -181.6 | -190.4 |
| Sales of short-term investments | 90.5 | 56.5 | 52.1 | 190.8 | 193.5 | 157.8 | 193.0 | 197.5 |
| Other cash from investing | -314.3 | -245.4 | -217.5 | | | 8.9 | | 1.1 |
| Cash from investing | -66.7 | -66.3 | -56.6 | -86.1 | -29.9 | -52.1 | -16.7 | -23.4 |
| |
| Cash dividends paid | | | | -28.0 | -26.9 | -24.1 | -22.2 | -20.5 |
| Repurchase of common stock, net | -39.6 | -35.6 | -28.7 | -32.4 | -28.9 | -23.6 | -63.5 | -23.7 |
| Financing costs | | | | -1.5 | | -6.7 | -2.7 | |
| Other cash from financing | 6.3 | -56.5 | -7.2 | 21.4 | -49.8 | -1.9 | 18.4 | -14.0 |
| Cash from financing | -33.4 | -92.1 | -35.9 | -37.5 | -105.5 | -43.0 | -64.6 | -58.3 |
| |
| Free cash flow | 166.8 | 202.4 | 188.4 | 86.2 | 98.3 | 69.9 | 118.1 | 57.7 |
| Per share (diluted) | $5.21 | $6.27 | $5.80 | $2.62 | $2.99 | $2.12 | $3.53 | $1.71 |
| |
| Cash paid for interest | 12.9 | 13.7 | 16.1 | 15.9 | 14.7 | 12.2 | 8.4 | 8.3 |