| 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 | 171.8 | 77.4 | 113.0 | 166.6 | 145.1 | 146.2 | 148.7 | 139.4 |
| Depreciation and amortization | 132.9 | 135.2 | 134.7 | 130.8 | 126.4 | 124.3 | 114.9 | 106.8 |
| Asset impairment charges | | | 5.7 | | | | | |
| Stock-based compensation | | | | 22.3 | 22.0 | 19.8 | 12.8 | 11.7 |
| Tax benefit from stock-based compensation | | | | | | | 1.6 | -1.4 |
| Deferred taxes | | | | -0.6 | 1.2 | 12.2 | -6.0 | -2.4 |
| Change in working capital [+] | 21.6 | -57.7 | 55.5 | 12.1 | 30.4 | 4.4 | 5.9 | 25.6 |
| Income taxes | -0.2 | 0.4 | -1.8 | 1.5 | -1.2 | 2.1 | 0.2 | 3.7 |
| Other | 21.8 | -58.1 | 57.3 | 10.7 | 31.7 | 2.4 | 5.6 | 21.9 |
| Other operating activities | -29.9 | 127.8 | 132.8 | 6.8 | -50.8 | 74.0 | -306.0 | -137.6 |
| Cash from operations | 296.4 | 282.6 | 441.7 | 338.1 | 274.5 | 381.0 | -28.0 | 142.2 |
| |
| Capital expenditures [+] | 90.0 | 69.4 | 108.8 | -117.2 | -195.7 | -148.4 | -81.6 | -117.6 |
| Purchases of property and equipment | 90.0 | 69.4 | 108.8 | -117.2 | -195.7 | -148.4 | -81.6 | -117.6 |
| Sales of property and equipment | | 4.1 | 0.1 | 0.4 | 2.1 | 3.5 | 2.0 | 0.0 |
| Acquisitions | | | | | | -353.6 | | -331.8 |
| Other cash from investing | -87.1 | -127.3 | -213.1 | 12.7 | 5.1 | -1.8 | 1.8 | -3.5 |
| Cash from investing | 3.0 | -53.7 | -104.2 | -104.1 | -188.5 | -500.3 | -77.7 | -452.9 |
| |
| Cash dividends paid | | 30.5 | 216.1 | -232.5 | -229.5 | -227.5 | -194.7 | -187.0 |
| Repurchase of common stock, net | | | -9.0 | | -95.2 | | | |
| Option exercises | 0.3 | 0.3 | 0.6 | 1.3 | 1.9 | 7.0 | 3.3 | 2.8 |
| Financing costs | 41.5 | 9.6 | | -9.9 | -1.0 | -9.5 | -21.1 | -7.1 |
| Other cash from financing | -657.3 | -9.3 | -303.3 | -26.7 | 200.6 | 389.6 | 296.6 | 514.9 |
| Cash from financing | -699.1 | 11.3 | -96.7 | -250.7 | -125.0 | 164.7 | 119.7 | 332.3 |
| |
| Free cash flow | 386.4 | 352.0 | 550.5 | 220.9 | 78.8 | 232.6 | -109.6 | 24.6 |
| Per share (diluted) | $3.16 | $2.92 | $4.59 | $1.85 | $0.65 | $1.93 | ($0.98) | $0.22 |
| |
| Cash paid for interest | 103.8 | 122.2 | 113.3 | 133.6 | 133.6 | 115.4 | 109.4 | 97.7 |