| 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 | 332.2 | 289.0 | 75.4 | 222.9 | 216.4 | 122.3 | 106.7 | 128.0 |
| Depreciation and amortization | 30.4 | 24.8 | 25.8 | 18.8 | 14.3 | 6.7 | 7.0 | 11.5 |
| Asset impairment charges | | 0.3 | 14.8 | 10.4 | 4.3 | | | |
| Deferred taxes | -19.6 | -1.0 | -44.8 | 9.8 | -3.5 | 57.1 | -29.7 | 0.6 |
| Change in working capital [+] | | | | | | | | 24.2 |
| Accounts receivable | | | | | | | | 0.4 |
| Accounts payable | | | | | | | | 6.5 |
| Accrued expenses | | | | | | | | 5.2 |
| Deferred revenues | | | | | | | | 5.3 |
| Income taxes | | | | | | | | 0.8 |
| Other | | | | | | | | 6.1 |
| Other operating activities | 24.1 | 70.7 | 38.9 | 8.7 | 11.4 | 71.3 | 68.1 | 0.7 |
| Cash from operations | 367.1 | 383.7 | 110.1 | 270.6 | 242.9 | 257.4 | 152.0 | 165.1 |
| |
| Capital expenditures [+] | -90.0 | -74.3 | -33.6 | -57.3 | -47.7 | -23.4 | -25.2 | -27.8 |
| Purchases of property and equipment | -90.0 | -74.3 | -33.6 | -57.3 | -47.7 | -23.4 | -25.2 | -27.8 |
| Sales of property and equipment | 166.6 | 6.1 | | 10.6 | 3.1 | 1.0 | 11.5 | 6.3 |
| Purchases of intangible assets | -3.6 | -3.6 | -1.4 | -6.7 | -1.8 | -2.5 | -2.6 | -0.7 |
| Acquisitions | -551.3 | | | -169.0 | -231.3 | | -1.3 | -13.3 |
| Other cash from investing | 35.9 | -7.2 | 10.5 | -28.8 | -43.5 | -65.2 | -80.8 | -64.4 |
| Cash from investing | -442.4 | -78.9 | -24.5 | -251.2 | -321.3 | -90.1 | -98.5 | -99.8 |
| |
| Cash dividends paid | -52.5 | -25.0 | -25.3 | -48.1 | -48.7 | -48.7 | -46.2 | -45.2 |
| Repurchase of common stock, net | -434.8 | -13.4 | -55.5 | -50.6 | -148.7 | -9.8 | -35.9 | -72.9 |
| Option exercises | 3.8 | 11.1 | 10.2 | 21.4 | 41.4 | 14.1 | 13.0 | 7.1 |
| Financing costs | 0.0 | -0.4 | -4.6 | -3.9 | -2.6 | | -0.3 | -2.2 |
| Other cash from financing | 96.9 | 21.4 | 201.7 | 103.7 | 106.7 | -63.2 | 50.7 | 38.3 |
| Cash from financing | -394.2 | -27.7 | 115.4 | -12.5 | -129.4 | -135.8 | -44.1 | -84.7 |
| |
| Free cash flow | 277.1 | 309.4 | 76.5 | 213.2 | 195.2 | 233.9 | 126.8 | 137.3 |
| Per share (diluted) | $5.03 | $5.54 | $1.38 | $3.83 | $3.45 | $4.14 | $2.26 | $2.40 |
| |
| Cash paid for interest | 46.9 | 43.9 | 45.1 | 48.2 | 43.3 | 42.4 | 42.0 | 40.1 |
| Cash paid for income taxes | 116.0 | 106.5 | 8.6 | 41.9 | 77.4 | 39.2 | 65.7 | 55.0 |