| In millions, except per share items | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | -11.9 | -0.3 | -24.8 | -52.7 | -39.3 | 16.2 | -7.4 | -16.4 |
| Depreciation and amortization [+] | 22.3 | 24.0 | 28.8 | 28.3 | 27.1 | 18.4 | 15.3 | 16.1 |
| Depreciation | 9.2 | 8.5 | 7.5 | 7.6 | 6.4 | 4.3 | 3.7 | 4.4 |
| Amortization of intangible assets | 13.1 | 15.6 | 21.3 | 20.7 | 20.7 | 14.1 | 11.6 | 11.7 |
| Stock-based compensation | 6.1 | 5.9 | 5.5 | 5.3 | 8.8 | 10.5 | 6.8 | 4.7 |
| Deferred taxes | -1.8 | 8.1 | -7.7 | 9.1 | -0.4 | -25.5 | 1.0 | 0.9 |
| Change in working capital [+] | -4.8 | 6.7 | -14.2 | -9.5 | -3.9 | -13.0 | 4.6 | -2.3 |
| Accounts receivable | -3.5 | 0.6 | -21.6 | -11.1 | -9.8 | -5.4 | -4.1 | -6.5 |
| Other | -1.2 | 6.1 | 7.4 | 1.6 | 5.9 | -7.6 | 8.8 | 4.2 |
| Other operating activities | 44.1 | 18.9 | 28.5 | 33.7 | 27.1 | 20.3 | 0.6 | 4.6 |
| Cash from operations | 54.0 | 63.4 | 16.2 | 14.2 | 19.3 | 26.9 | 20.9 | 7.6 |
| |
| Capital expenditures [+] | -13.0 | -14.5 | -9.9 | -7.1 | -8.3 | -7.4 | -6.9 | -5.5 |
| Purchases of property and equipment | -13.0 | -14.5 | -9.9 | -7.1 | -8.3 | -7.4 | -6.9 | -5.5 |
| Sales of property and equipment | 0.0 | | | | | | 0.1 | |
| Acquisitions | | -6.2 | -0.2 | -4.1 | -36.4 | -9.3 | | 0.6 |
| Other cash from investing | 0.0 | 2.8 | | | 16.5 | 0.1 | -0.3 | -1.0 |
| Cash from investing | -13.0 | -17.8 | -10.1 | -11.2 | -28.2 | -16.6 | -7.0 | -5.9 |
| |
| Cash dividends paid | -7.2 | -8.8 | -3.9 | | | | | |
| Repurchase of common stock, net | -8.1 | -65.5 | 3.8 | -11.7 | -14.3 | -6.3 | -5.2 | -0.6 |
| Financing costs | | | 0.0 | | | | | |
| Other cash from financing | 34.6 | 45.1 | 66.8 | -11.1 | 38.8 | | | |
| Cash from financing | 19.3 | -29.1 | 66.8 | -22.8 | 24.5 | 42.5 | 1.0 | 2.1 |
| |
| Free cash flow | 41.0 | 48.9 | 6.3 | 7.1 | 11.0 | 19.4 | 14.0 | 2.2 |
| Per share (diluted) | $0.29 | $0.25 | $0.03 | $0.04 | $0.06 | $0.09 | $0.08 | $0.01 |
| |
| Cash paid for interest | 21.7 | 9.9 | 2.0 | 3.5 | 3.8 | 5.9 | 16.0 | 23.0 |