| In millions, except per share items | Dec-31-18 | Sep-30-18 | Jun-30-18 | Mar-31-18 | Dec-31-17 | Sep-30-17 | Jun-30-17 | Mar-31-17 |
| | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q |
| Net income | 75.0 | 58.0 | 58.0 | 36.0 | 168.0 | 66.0 | 46.0 | 55.0 |
| Depreciation and amortization | 37.0 | 37.0 | 40.0 | 36.0 | 34.0 | 33.0 | 32.0 | 33.0 |
| Stock-based compensation | 6.0 | 5.0 | 6.0 | 4.0 | 5.0 | 4.0 | 5.0 | 4.0 |
| Deferred taxes | -5.0 | 13.0 | 13.0 | 7.0 | 180.0 | 27.0 | 19.0 | 29.0 |
| Change in working capital [+] | -108.0 | | | | -146.0 | | | |
| Accounts receivable | -5.0 | | | | -32.0 | | | |
| Inventories | -42.0 | | | | -13.0 | | | |
| Other current assets | | | | | -3.0 | | | |
| Accounts payable | 7.0 | | | | 20.0 | | | |
| Accrued expenses | -2.0 | | | | -36.0 | | | |
| Other | -66.0 | | | | -82.0 | | | |
| Other operating activities | 129.0 | 16.0 | -83.0 | -99.0 | -62.0 | -56.0 | 56.0 | -150.0 |
| Cash from operations | 134.0 | 129.0 | 34.0 | -16.0 | 179.0 | 74.0 | 158.0 | -29.0 |
| |
| Capital expenditures [+] | -60.0 | -50.0 | -57.0 | -52.0 | -59.0 | -37.0 | -33.0 | -39.0 |
| Purchases of property and equipment | -60.0 | -50.0 | -57.0 | -52.0 | -59.0 | -37.0 | -33.0 | -39.0 |
| Sales of property and equipment | | | 14.0 | | | | 2.0 | |
| Acquisitions | 4.0 | -4.0 | | 2.0 | -52.0 | | | |
| Purchases of short-term investments, net | 3.0 | -4.0 | | 2.0 | -2.0 | -5.0 | 1.0 | -2.0 |
| Purchases of short-term investments | -27.0 | -26.0 | -23.0 | -26.0 | -30.0 | -21.0 | -30.0 | -24.0 |
| Sales of short-term investments | 30.0 | 22.0 | 23.0 | 28.0 | 28.0 | 16.0 | 31.0 | 22.0 |
| Other cash from investing | -2.0 | 6.0 | 3.0 | | | | 1.0 | 6.0 |
| Cash from investing | -55.0 | -52.0 | -40.0 | -48.0 | -113.0 | -42.0 | -29.0 | -35.0 |
| |
| Cash dividends paid | -70.0 | | | | | | | |
| Repurchase of common stock, net | 1.0 | 4.0 | -12.0 | -58.0 | -19.0 | -56.0 | -72.0 | -22.0 |
| Financing costs | | | | | | | -8.0 | |
| Other cash from financing | -8.0 | | | -7.0 | -1.0 | | -37.0 | -3.0 |
| Cash from financing | -77.0 | 4.0 | -12.0 | -65.0 | -20.0 | -56.0 | -101.0 | -25.0 |
| |
| Free cash flow | 74.0 | 79.0 | -23.0 | -68.0 | 120.0 | 37.0 | 125.0 | -68.0 |
| Per share (diluted) | $0.52 | $0.55 | ($0.16) | ($0.47) | $0.82 | $0.26 | $0.85 | ($0.46) |
| |
| Cash paid for interest | 14.0 | 12.0 | 15.0 | 12.0 | 16.0 | 18.0 | 13.0 | 35.0 |
| Cash paid for income taxes | 4.0 | 1.0 | 2.0 | 2.0 | -3.0 | 4.0 | 7.0 | 2.0 |