| In millions, except per share items | Dec-30-21 | Dec-31-20 | Dec-26-19 | Dec-27-18 | Dec-28-17 | Dec-29-16 | Dec-31-15 | Jan-01-15 |
| | 8-K | 8-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | -48.7 | -65.4 | 36.1 | 29.8 | 58.3 | 32.9 | 11.3 | 13.4 |
| Depreciation and amortization [+] | | | 40.3 | 39.9 | 37.6 | 35.8 | 32.2 | 32.4 |
| Depreciation | 10.9 | 13.1 | 13.6 | 12.6 | 11.0 | | | |
| Amortization | | | 26.7 | 27.3 | 26.6 | | | |
| Asset impairment charges | | | 2.0 | 0.4 | 3.1 | 0.7 | | |
| Stock-based compensation | | | 5.5 | 7.8 | 11.2 | 18.3 | 14.8 | 7.7 |
| Tax benefit from stock-based compensation | | | | | | | -0.1 | 0.1 |
| Deferred taxes | | | 12.1 | 23.3 | 181.9 | 16.7 | 13.8 | 12.6 |
| Change in working capital [+] | | | -16.9 | 17.6 | -2.3 | -18.7 | -15.9 | -0.6 |
| Accounts receivable | | | -20.9 | 10.7 | -0.1 | -13.5 | -35.5 | 2.7 |
| Deferred revenues | | | | | | | 1.7 | 3.8 |
| Income taxes | | | -1.7 | 2.2 | -4.2 | -1.0 | 8.7 | 0.2 |
| Other | | | 5.7 | 4.7 | 2.0 | -4.2 | 9.2 | -7.3 |
| Other operating activities | | | 64.5 | 31.5 | -150.9 | 47.8 | 49.2 | |
| Cash from operations | | | 143.6 | 150.3 | 138.9 | 133.5 | 105.3 | 117.9 |
| |
| Capital expenditures | | | -14.0 | -14.2 | -11.6 | -12.9 | -12.6 | -8.7 |
| Purchases of property and equipment | | | -14.0 | -14.2 | -11.6 | -12.9 | -12.6 | -8.7 |
| Purchases of intangible assets | | | | -0.1 | -2.1 | -2.3 | -2.7 | -3.0 |
| Purchases of short-term investments, net | | | 10.0 | -4.6 | 16.5 | 8.1 | -70.6 | 4.0 |
| Purchases of short-term investments | | | -24.5 | -36.8 | -34.4 | -54.7 | -70.6 | -116.8 |
| Sales of short-term investments | | | 34.5 | 32.2 | 50.9 | 62.8 | | 120.8 |
| Other cash from investing | | | 5.6 | 2.8 | 5.7 | 2.8 | 87.3 | 4.2 |
| Cash from investing | | | 1.6 | -16.1 | 8.5 | -4.3 | 1.4 | -3.5 |
| |
| Cash dividends paid | | | -53.6 | -54.4 | -58.7 | -54.6 | -52.3 | -81.0 |
| Option exercises | | | | | 0.6 | 0.5 | 1.3 | 0.8 |
| Financing costs | | | -4.6 | -6.9 | | -4.8 | | -0.6 |
| Other cash from financing | | | -81.7 | -75.5 | -80.9 | -87.6 | -34.8 | -74.5 |
| Cash from financing | | | -130.7 | -123.0 | -140.2 | -137.9 | -88.4 | -155.7 |
| |
| Free cash flow | | | 129.6 | 136.1 | 127.3 | 120.6 | 92.7 | 109.2 |
| Per share (diluted) | | | $1.67 | $1.73 | $0.84 | $1.99 | $1.56 | $1.85 |
| |
| Cash paid for interest | | | 54.3 | 54.1 | 49.9 | 52.5 | 49.7 | 49.9 |
| Cash paid for income taxes | | | 0.1 | 0.3 | -1.7 | 0.5 | -2.7 | -5.2 |