| In millions, except per share items | Sep-30-19 | Jun-30-19 | Mar-31-19 | Dec-31-18 | Sep-30-18 | Jun-30-18 | Mar-31-18 | Dec-31-17 |
| | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q |
| Net income | 24.0 | 9.8 | 5.0 | 5.6 | 14.7 | 14.2 | 0.5 | 99.4 |
| Depreciation and amortization [+] | 21.9 | 21.7 | 21.6 | 21.5 | 21.5 | 21.5 | 20.5 | 21.1 |
| Depreciation | 3.1 | 2.9 | 2.9 | 2.7 | 2.6 | 2.6 | 2.2 | 2.3 |
| Amortization of intangible assets | 18.8 | 18.8 | 18.7 | 18.8 | 18.9 | 18.9 | 18.3 | 18.8 |
| Stock-based compensation | 1.6 | 2.6 | 2.2 | 2.6 | 2.1 | 1.4 | 3.0 | 1.8 |
| Deferred taxes | -2.4 | 0.9 | 2.1 | 0.9 | -3.9 | -5.4 | 0.9 | -83.4 |
| Change in working capital [+] | -77.9 | -36.9 | -1.3 | 41.7 | -33.1 | 15.1 | -23.4 | |
| Accounts receivable | -27.4 | -71.9 | 18.5 | -2.2 | -47.2 | -30.5 | 15.5 | 9.7 |
| Inventories | -1.0 | 2.2 | -4.6 | 12.3 | -7.4 | -0.7 | 3.2 | -4.1 |
| Other current assets | -36.2 | -27.0 | -35.8 | 6.8 | -30.7 | -4.3 | -21.2 | 31.8 |
| Accounts payable | -11.8 | 4.7 | 16.4 | -4.3 | 23.2 | 21.9 | -6.2 | -40.2 |
| Accrued expenses | -1.5 | 55.1 | 4.2 | 29.1 | 29.0 | 28.7 | -14.7 | 2.8 |
| Other operating activities | 0.5 | 3.3 | 1.0 | 1.0 | 1.4 | 2.5 | 16.6 | 2.1 |
| Cash from operations | -32.3 | 1.4 | 30.6 | 73.3 | 2.7 | 49.3 | 18.1 | 41.0 |
| |
| Capital expenditures [+] | -2.2 | -3.8 | -3.1 | -4.4 | -3.8 | -3.9 | -3.3 | -2.5 |
| Purchases of property and equipment | -2.2 | -3.8 | -3.1 | -4.4 | -3.8 | -3.9 | -3.3 | -2.5 |
| Sales of property and equipment | 0.4 | 0.1 | 0.5 | 0.1 | | | | 0.1 |
| Acquisitions | | | | | | -33.3 | | |
| Other cash from investing | -32.2 | -17.6 | -35.9 | -48.3 | -32.1 | -26.7 | -30.4 | -29.6 |
| Cash from investing | -34.0 | -21.3 | -38.5 | -52.6 | -35.9 | -63.9 | -33.7 | -32.0 |
| |
| Cash dividends paid | -3.3 | -16.5 | 9.9 | -3.3 | | | | |
| Repurchase of common stock, net | | | | | -158.6 | | | |
| Option exercises | 4.1 | 1.3 | 2.3 | 0.5 | 1.0 | 2.1 | 1.4 | 1.6 |
| Financing costs | | 0.1 | -0.5 | | -0.3 | | -0.6 | -0.6 |
| Other cash from financing | 71.0 | 39.5 | -2.1 | -16.2 | 185.7 | 28.8 | 20.6 | -12.2 |
| Cash from financing | 63.6 | 21.6 | 6.0 | -20.0 | 26.4 | 26.7 | 19.8 | -13.2 |
| |
| Free cash flow | -34.5 | -2.4 | 27.5 | 68.9 | -1.1 | 45.4 | 14.8 | 38.5 |
| Per share (diluted) | ($0.40) | ($0.03) | $0.32 | $0.80 | ($0.01) | $0.47 | $0.15 | $0.40 |
| |
| Cash paid for interest | 11.7 | 12.2 | 12.0 | 10.6 | 9.7 | 8.8 | 13.4 | 8.4 |
| Cash paid for income taxes | 3.6 | 1.4 | 1.6 | 8.6 | 5.7 | -9.6 | 7.0 | 14.9 |