| In millions, except per share items | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 | Dec-31-11 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | 66.7 | 62.6 | 53.0 | 8.5 | 50.2 | 0.0 |
| Depreciation and amortization | 39.2 | 35.4 | 28.9 | 16.5 | 14.3 | 12.7 |
| Stock-based compensation | 2.7 | 2.0 | 1.6 | 0.0 | | |
| Deferred taxes | 0.6 | | | | | |
| Change in working capital [+] | 22.4 | 4.2 | 28.7 | -6.4 | -93.5 | 0.8 |
| Accounts receivable | -10.2 | -0.3 | -54.4 | -0.1 | -0.3 | 0.1 |
| Inventories | 5.1 | -0.7 | 1.8 | -2.6 | -1.4 | |
| Other | 27.6 | 5.2 | 81.3 | -3.7 | -91.8 | 0.7 |
| Other operating activities | -23.4 | -31.6 | -22.8 | -55.0 | -99.5 | -67.1 |
| Cash from operations | 108.2 | 72.5 | 89.4 | -36.3 | -128.5 | -53.6 |
| |
| Capital expenditures [+] | -30.3 | -67.6 | -79.3 | -84.8 | -28.1 | -3.9 |
| Purchases of property and equipment | -30.3 | -67.6 | -79.3 | -84.8 | -28.1 | -3.9 |
| Sales of property and equipment | 5.3 | 0.5 | 0.1 | 0.0 | 0.3 | 40.0 |
| Acquisitions | 195.0 | 170.0 | 320.0 | | | |
| Other cash from investing | -195.0 | -170.0 | -320.0 | | | |
| Cash from investing | -25.0 | -67.1 | -79.2 | -84.8 | -27.8 | 36.1 |
| |
| Cash dividends paid | 84.6 | 67.0 | 53.4 | | | |
| Issuance of common stock, net | | | | 325.3 | | |
| Financing costs | -1.2 | -6.8 | | -2.6 | | |
| Other cash from financing | -199.0 | -88.9 | -93.3 | -122.8 | 156.3 | 17.5 |
| Cash from financing | -113.1 | -15.1 | -39.8 | 205.1 | 156.3 | 17.5 |
| |
| Free cash flow | 77.9 | 4.9 | 10.0 | -121.1 | -156.6 | -57.5 |
| Per share (diluted) | $1.48 | $0.10 | $0.22 | ($2.66) | | |
| |
| Cash paid for interest | 25.3 | 13.4 | 1.8 | | | |
| Cash paid for income taxes | 0.4 | 0.5 | 0.0 | | | |