| In millions, except per share items | Jun-30-23 | Mar-31-23 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 |
| | 10-Q | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q |
| Net income | 40.4 | 71.3 | 102.5 | 69.6 | 65.5 | 63.7 | 61.0 | 23.4 |
| Depreciation and amortization [+] | 35.8 | 35.4 | 35.3 | 34.8 | 33.2 | 30.4 | 30.3 | 30.4 |
| Depreciation | 32.6 | 32.2 | 32.1 | 31.6 | 30.8 | 29.4 | 29.3 | 29.4 |
| Amortization of intangible assets | 3.2 | 3.2 | 3.2 | 3.2 | 2.5 | 1.0 | 1.0 | 1.0 |
| Stock-based compensation | 3.4 | 2.2 | 3.9 | 2.8 | 2.9 | 2.9 | 3.3 | 2.4 |
| Deferred taxes | 1.6 | -9.8 | -5.0 | -1.4 | 1.0 | -1.0 | -2.6 | -5.0 |
| Change in working capital [+] | 5.2 | 48.7 | 34.1 | -109.6 | -23.1 | -64.0 | -5.3 | -18.8 |
| Accounts receivable | 39.6 | 44.0 | 16.6 | -103.7 | -18.9 | -66.1 | -15.2 | -22.6 |
| Income taxes | -42.2 | 6.2 | 7.2 | -3.0 | 5.0 | -4.1 | 5.9 | 6.4 |
| Other | 7.8 | -1.5 | 10.3 | -2.9 | -9.1 | 6.2 | 4.0 | -2.6 |
| Other operating activities | -3.3 | -127.2 | 25.0 | -7.4 | 5.7 | 60.5 | 36.7 | -9.8 |
| Cash from operations | 83.1 | 20.7 | 195.9 | -11.3 | 85.2 | 92.4 | 123.4 | 22.5 |
| |
| Capital expenditures [+] | -51.9 | -38.3 | -34.2 | -24.0 | -20.7 | -22.9 | -19.6 | -15.3 |
| Purchases of property and equipment | -48.5 | -34.7 | -30.2 | -19.5 | -14.9 | -18.1 | -15.8 | -9.6 |
| Capitalized product costs | -3.4 | -3.6 | -4.0 | -4.5 | -5.8 | -4.8 | -3.8 | -5.7 |
| Sales of property and equipment | 1.0 | 1.8 | 3.8 | 5.3 | 2.3 | 0.6 | 0.8 | 10.1 |
| Acquisitions | | | 2.3 | | -239.4 | | | |
| Sales of short-term investments, net [+] | 10.6 | 6.3 | -39.7 | 11.3 | 12.0 | -0.3 | -0.8 | 6.3 |
| Purchases of short-term investments | -11.3 | -35.6 | -52.0 | -12.3 | | -12.3 | -25.6 | -18.1 |
| Sales of short-term investments | 21.8 | 41.9 | 12.3 | 23.6 | 12.0 | 12.0 | 24.7 | 24.4 |
| Other cash from investing | -0.2 | 101.1 | 0.5 | | -25.4 | | 9.0 | |
| Cash from investing | -40.5 | 71.0 | -67.4 | -7.4 | -271.1 | -22.6 | -10.6 | 1.1 |
| |
| Cash dividends paid | -2.9 | -2.9 | -2.9 | -2.0 | -2.0 | -2.1 | -2.1 | -2.0 |
| Repurchase of common stock, net | -27.1 | -14.1 | -14.7 | -16.5 | -75.0 | | -7.1 | -1.0 |
| Financing costs | 0.0 | 0.1 | | | 0.0 | -0.1 | -0.2 | |
| Other cash from financing | -28.6 | -29.6 | -47.8 | 24.6 | -68.7 | -22.3 | -42.7 | -23.0 |
| Cash from financing | -58.6 | -46.7 | -65.5 | 6.1 | -145.7 | -24.2 | -51.7 | -26.0 |
| |
| Free cash flow | 34.6 | -14.0 | 165.7 | -30.7 | 70.3 | 74.3 | 107.6 | 12.9 |
| Per share (diluted) | $1.26 | ($0.70) | $6.31 | ($1.36) | $2.41 | $2.60 | $3.86 | $0.27 |