| In millions, except per share items | Jun-30-23 | Mar-31-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Net income | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Depreciation and amortization | 19.4 | 19.0 | 19.0 | 18.6 | 18.6 | 17.6 | 18.6 | 17.5 |
| Stock-based compensation | 4.8 | 3.9 | 2.1 | 3.1 | 5.0 | 4.0 | 3.8 | 5.6 |
| Deferred taxes | | | 5.5 | -45.2 | | | 40.1 | |
| Change in working capital [+] | -19.9 | -1.9 | -27.0 | 9.3 | -20.9 | -13.6 | 17.4 | 18.0 |
| Accounts receivable | -0.7 | -4.3 | 4.6 | 12.4 | -13.7 | 11.8 | -15.6 | 6.1 |
| Accounts payable | -1.1 | 8.1 | -22.5 | 4.6 | 10.9 | -33.5 | 49.6 | -3.9 |
| Income taxes | -13.9 | 3.1 | 3.3 | 0.9 | -16.9 | 12.0 | -11.6 | 14.8 |
| Other | -4.2 | -8.8 | -12.4 | -8.6 | -1.3 | -3.9 | -5.0 | 1.0 |
| Other operating activities | 76.3 | -34.1 | 108.1 | 79.3 | 74.7 | -13.3 | 80.6 | 26.1 |
| Cash from operations | 80.6 | -13.0 | 107.7 | 65.0 | 77.4 | -5.4 | 160.4 | 67.3 |
| |
| Capital expenditures | -39.8 | -29.8 | -63.7 | -39.6 | -42.5 | -52.4 | -74.4 | -66.5 |
| Purchases of property and equipment | -39.8 | -29.8 | -63.7 | -39.6 | -42.5 | -52.4 | -74.4 | -66.5 |
| Acquisitions | | | -47.3 | 47.3 | -47.3 | | | |
| Sales of short-term investments | | | | -2.0 | | | | |
| Sales of short-term investments | | | | -2.0 | | | | |
| Other cash from investing | 3.7 | | 47.9 | -34.0 | -9.0 | -13.5 | 3.8 | 2.0 |
| Cash from investing | -36.1 | -29.8 | -63.2 | -28.3 | -98.8 | -65.9 | -70.6 | -64.5 |
| |
| Cash dividends paid | -21.1 | -21.7 | -20.2 | -20.1 | -20.1 | -20.7 | -19.4 | -20.0 |
| Repurchase of common stock, net | | | | | | -20.0 | -40.0 | -165.8 |
| Option exercises | | | | 0.1 | | | | |
| Financing costs | | | -2.4 | | | | | |
| Other cash from financing | -31.6 | 71.0 | -44.6 | -28.6 | 84.6 | 101.2 | -66.1 | 61.7 |
| Cash from financing | -52.6 | 49.3 | -62.3 | -48.8 | 64.5 | 60.6 | -125.5 | -124.1 |
| |
| Free cash flow | 40.8 | -42.8 | 43.9 | 25.4 | 34.9 | -57.8 | 86.1 | 0.8 |
| Per share (diluted) | $0.44 | ($0.47) | $0.48 | $0.28 | $0.38 | ($0.63) | $0.91 | $0.01 |
| |
| Cash paid for interest | 26.4 | 8.2 | 24.5 | 5.1 | 19.8 | 1.9 | 18.6 | 11.9 |
| Cash paid for income taxes | 32.8 | 15.5 | 4.2 | 67.6 | 38.9 | 6.3 | 1.7 | 2.6 |