| 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 | 44.4 | 35.1 | 39.5 | 35.0 | 128.8 | 134.0 | 130.2 | 114.7 |
| Depreciation and amortization [+] | 86.7 | 86.3 | 86.1 | 85.0 | 84.6 | 83.7 | 82.7 | 82.7 |
| Depreciation | 11.6 | 11.1 | 10.8 | 10.1 | 9.7 | 9.3 | 8.8 | 8.7 |
| Amortization of intangible assets | 75.1 | 75.2 | 75.3 | 74.9 | 74.9 | 74.4 | 73.9 | 74.0 |
| Stock-based compensation | 9.0 | 9.5 | 8.3 | 9.1 | 8.3 | 7.0 | 6.9 | 11.8 |
| Deferred taxes | 1.5 | 0.0 | -6.3 | -7.5 | -91.8 | -93.4 | -91.2 | -97.2 |
| Change in working capital [+] | -74.4 | -29.6 | 22.4 | 0.3 | -41.4 | 36.3 | -56.6 | |
| Accounts receivable | -83.0 | -102.8 | -61.4 | -64.4 | -52.5 | -19.6 | -124.5 | -53.9 |
| Inventories | 8.9 | 2.5 | -0.4 | 7.4 | -9.0 | 0.3 | -2.6 | 10.1 |
| Other current assets | -92.2 | -86.7 | -64.0 | -49.4 | -24.4 | -25.1 | -16.2 | -2.1 |
| Accounts payable | 5.0 | 40.0 | 57.2 | 34.6 | -1.3 | 96.4 | 78.3 | -26.5 |
| Accrued expenses | 86.9 | 117.4 | 91.0 | 72.1 | 45.8 | -15.7 | 8.4 | 15.2 |
| Other operating activities | 5.8 | 6.7 | 5.9 | 21.5 | 22.6 | 24.4 | 25.4 | 37.5 |
| Cash from operations | 73.0 | 108.0 | 155.9 | 143.4 | 111.1 | 192.0 | 97.4 | 92.3 |
| |
| Capital expenditures [+] | -13.5 | -15.1 | -15.2 | -15.4 | -13.5 | -14.4 | -13.0 | -11.9 |
| Purchases of property and equipment | -13.5 | -15.1 | -15.2 | -15.4 | -13.5 | -14.4 | -13.0 | -11.9 |
| Sales of property and equipment | 1.1 | 0.7 | 0.6 | 0.1 | | | | 1.7 |
| Acquisitions | | | | | | -42.8 | | |
| Other cash from investing | -134.0 | -133.9 | -143.0 | -137.5 | -118.8 | -105.6 | -102.1 | -83.8 |
| Cash from investing | -146.4 | -148.3 | -190.9 | -186.1 | -165.5 | -162.1 | -123.8 | -103.5 |
| |
| Cash dividends paid | -13.2 | -9.9 | 6.6 | -3.3 | | | | |
| Repurchase of common stock, net | | | | | -158.6 | | | |
| Option exercises | 8.2 | 5.1 | 5.9 | 5.0 | 6.1 | 8.0 | 6.4 | 5.5 |
| Financing costs | | -0.7 | -0.8 | | -1.5 | | -1.2 | -0.6 |
| Other cash from financing | 92.2 | 206.9 | 196.2 | 218.9 | 222.9 | -13.6 | 28.7 | -256.2 |
| Cash from financing | 71.2 | 34.0 | 39.1 | 52.9 | 59.7 | -20.4 | 23.5 | -13.6 |
| |
| Free cash flow | 59.5 | 92.9 | 140.7 | 128.0 | 97.6 | 177.6 | 84.4 | 80.4 |
| Per share (diluted) | $0.69 | $1.04 | $1.55 | $1.37 | $1.01 | $1.84 | $0.91 | $0.92 |
| |
| Cash paid for interest | 46.5 | 44.5 | 41.1 | 42.5 | 40.3 | 44.8 | 43.0 | 60.9 |
| Cash paid for income taxes | 15.2 | 17.3 | 6.3 | 11.7 | 18.0 | 20.3 | 30.6 | 24.5 |