| 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/A | 10-K |
| Net income | 70.3 | -7.4 | 55.9 | 78.2 | 132.9 | 71.5 | 156.1 | 159.8 |
| Depreciation and amortization [+] | 63.1 | 62.2 | 61.1 | 55.0 | 47.9 | 48.5 | 51.0 | 53.0 |
| Depreciation | 22.2 | 21.6 | 21.3 | 18.0 | 16.7 | 17.3 | 19.6 | 21.2 |
| Amortization of intangible assets | 40.9 | 40.6 | 39.8 | 37.0 | 31.2 | 31.2 | 31.4 | 31.8 |
| Asset impairment charges | | | | | | | 9.9 | |
| Stock-based compensation | 15.0 | 4.7 | 7.3 | 7.0 | 11.1 | 6.3 | 2.3 | 2.4 |
| Deferred taxes | -8.9 | -8.2 | -19.8 | -12.4 | -64.3 | -7.6 | -29.0 | -17.5 |
| Change in working capital [+] | -87.8 | -43.9 | -393.6 | -600.6 | -561.5 | -489.9 | -33.9 | 1.3 |
| Accounts receivable | -57.9 | 21.8 | -351.4 | -590.4 | -541.2 | -502.8 | -7.5 | -0.3 |
| Inventories | -116.2 | 10.2 | 5.0 | -25.5 | -1.8 | -3.6 | 4.7 | -23.8 |
| Accounts payable | 42.9 | -21.6 | -46.8 | 39.3 | -7.9 | -11.1 | -25.6 | 21.2 |
| Other | 43.4 | -54.3 | -0.4 | -24.0 | -10.6 | 27.6 | -5.5 | 4.2 |
| Other operating activities | 4.4 | 7.6 | 19.4 | 24.3 | 2.6 | -0.8 | -13.4 | 1.2 |
| Cash from operations | 56.1 | 15.0 | -269.7 | -448.5 | -431.3 | -372.0 | 143.0 | 200.2 |
| |
| Capital expenditures [+] | -25.9 | -20.1 | -33.9 | -21.4 | -20.7 | -16.0 | -13.2 | -25.3 |
| Purchases of property and equipment | -25.9 | -20.1 | -33.9 | -21.4 | -20.7 | -16.0 | -13.2 | -25.3 |
| Sales of property and equipment | | | | | 12.3 | 0.5 | | |
| Purchases of intangible assets | | -0.2 | | -2.8 | -1.2 | | | |
| Acquisitions | | | | -215.6 | | | -5.3 | |
| Purchases of short-term investments, net | | | 32.0 | -14.3 | | -18.7 | | |
| Purchases of short-term investments | | | | -35.0 | | -18.7 | | |
| Sales of short-term investments | | | 32.0 | 20.7 | | | | |
| Other cash from investing | | -3.9 | 281.8 | 567.6 | 553.0 | 495.4 | 77.6 | |
| Cash from investing | -25.9 | -24.2 | 279.9 | 313.5 | 543.4 | 461.2 | 59.1 | -25.3 |
| |
| Option exercises | 10.9 | 1.2 | 3.2 | 11.3 | 6.7 | 16.2 | | |
| Financing costs | | -2.1 | | -6.8 | -2.0 | -41.3 | | |
| Other cash from financing | -10.5 | -2.2 | 49.8 | 106.8 | -47.0 | -106.3 | -183.1 | -167.0 |
| Cash from financing | -21.4 | -1.3 | 46.6 | 102.3 | -51.7 | -81.2 | -183.1 | -167.0 |
| |
| Free cash flow | 30.2 | -5.1 | -303.6 | -469.9 | -452.0 | -388.0 | 129.8 | 174.9 |
| Per share (diluted) | $0.21 | ($0.04) | ($2.14) | ($3.32) | ($3.21) | ($2.78) | $0.95 | $1.28 |
| |
| Cash paid for interest | 69.9 | 76.0 | 79.0 | 94.6 | 94.7 | 69.6 | | |
| Cash paid for income taxes | 30.8 | 17.8 | 36.0 | 47.0 | 34.3 | 42.1 | 13.2 | |