| 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 | 121.7 | 198.1 | 248.0 | 312.2 | 313.3 | 228.1 | 184.9 | 97.5 |
| Depreciation and amortization [+] | 47.0 | 47.4 | 47.9 | 47.4 | 46.9 | 46.1 | 44.9 | 43.6 |
| Depreciation | 47.0 | 47.4 | 47.9 | 47.4 | 46.9 | 46.1 | 44.9 | 43.6 |
| Stock-based compensation | 7.0 | 6.5 | 6.1 | 5.8 | 5.1 | 4.1 | 3.5 | 3.0 |
| Change in working capital [+] | 16.6 | 9.7 | -11.4 | -15.9 | -20.4 | -27.6 | -6.6 | -9.7 |
| Accounts receivable | 15.1 | 10.7 | -4.1 | -9.4 | -20.1 | -20.7 | -15.0 | -11.7 |
| Inventories | 3.5 | 4.9 | -10.4 | -9.2 | -9.3 | -13.1 | -6.0 | -5.4 |
| Accounts payable | 0.1 | -4.1 | -0.3 | 6.1 | 3.6 | 6.6 | 10.1 | 4.6 |
| Other | -2.2 | -1.8 | 3.5 | -3.3 | 5.3 | -0.4 | 4.3 | 2.8 |
| Other operating activities | -2.0 | 1.8 | 7.6 | -18.8 | -26.2 | -13.5 | -17.4 | 1.4 |
| Cash from operations | 190.2 | 263.4 | 298.3 | 330.7 | 318.8 | 237.1 | 209.2 | 135.9 |
| |
| Capital expenditures [+] | -0.1 | -0.1 | -0.3 | -0.3 | -0.3 | -0.2 | 0.0 | 0.0 |
| Purchases of property and equipment | -0.1 | -0.1 | -0.3 | -0.3 | -0.3 | -0.2 | 0.0 | 0.0 |
| Sales of property and equipment | 55.6 | 23.3 | 14.9 | 14.9 | | | 9.2 | 27.8 |
| Other cash from investing | -116.0 | -61.5 | -38.3 | -29.3 | -53.4 | -85.0 | -134.6 | -122.5 |
| Cash from investing | -60.4 | -38.3 | -23.7 | -14.6 | -44.5 | -76.0 | -125.5 | -94.7 |
| |
| Cash dividends paid | -62.2 | -86.8 | -105.0 | -107.3 | -78.6 | -52.6 | -25.8 | |
| Repurchase of common stock, net | -221.2 | | | | | | 27.1 | 27.2 |
| Option exercises | | | | | | 0.1 | | 0.1 |
| Financing costs | | | | | | -5.6 | -5.7 | -0.4 |
| Other cash from financing | 130.3 | -66.1 | -66.0 | -142.4 | -143.0 | -138.1 | -93.4 | -28.3 |
| Cash from financing | -153.0 | -152.9 | -171.1 | -244.2 | -216.5 | -158.1 | -86.3 | -0.8 |
| |
| Free cash flow | 190.1 | 263.3 | 298.0 | 330.5 | 318.5 | 236.9 | 209.1 | 135.8 |
| Per share (diluted) | $12.32 | $16.98 | $18.30 | $20.49 | $19.83 | $15.72 | $15.00 | $10.78 |
| |
| Cash paid for interest | 20.6 | 18.6 | 16.5 | 21.4 | 19.7 | 26.5 | 26.0 | 26.7 |