| In millions, except per share items | Jun-30-23 | Jun-30-22 | Mar-31-22 | Jun-30-21 | Mar-31-21 | Dec-31-20 | Sep-30-20 | Jun-30-20 |
| | 10-Q | 10-Q | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q |
| Cash flows from operating activities: | | | | | | | | |
| Net income (loss) | | | | 133.3 | 83.4 | -51.9 | -112.4 | -156.8 |
| Adjustments to reconcile net income (loss) to cash flows from (used for) operating activities: | | | | | | | | |
| Depreciation and amortization | | | | 511.0 | 521.9 | 525.0 | 521.2 | 540.8 |
| Impairment of long-lived assets | | | | 0.2 | 0.2 | | | |
| Losses (gains) on investments, net | | | | -130.7 | -94.0 | 31.3 | 36.9 | 43.6 |
| Equity in losses of unconsolidated affiliates, net | | | | 6.2 | 8.5 | 7.3 | 6.3 | 7.4 |
| Deferred tax provision, net | | | | 54.6 | 46.6 | 18.1 | 14.1 | 23.1 |
| Stock-based compensation | | | | 8.2 | 8.5 | 8.9 | 9.1 | 9.0 |
| Other-than-temporary impairment losses on equity method investments | | | | | | | | |
| Other, net | | | | 1.0 | 3.9 | -12.5 | -12.5 | -3.7 |
| Changes in assets and liabilities, net: | | | | | | | | |
| Trade accounts receivable and contract assets, net | | | | 4.1 | 3.8 | 2.2 | 4.6 | 2.9 |
| Other current assets, net | | | | -2.5 | 1.4 | -13.0 | -18.1 | -50.7 |
| Trade accounts payable | | | | -10.3 | -21.2 | -12.3 | -22.9 | 1.7 |
| Contract liabilities | | | | 38.0 | 14.7 | 3.5 | -22.3 | -18.9 |
| Accrued expenses and other current liabilities | | | | 16.4 | 20.3 | 42.8 | 67.5 | 76.6 |
| Non-current assets and non-current liabilities, net | | | | -25.9 | -11.5 | -15.1 | 13.2 | 17.5 |
| Net cash provided by (used for) operating activities | | | | 597.7 | 580.0 | 534.4 | 488.7 | 520.8 |
| |
| Cash flows from investing activities: | | | | | | | | |
| Purchases of marketable investment securities | | | | -3,183.7 | -2,638.0 | -2,799.8 | -2,572.8 | -1,044.5 |
| Expenditures for property and equipment | | | | -474.4 | -483.4 | -408.8 | -398.8 | -396.0 |
| Expenditures for externally marketed software | | | | -36.3 | -37.9 | -38.7 | -35.8 | -33.2 |
| Net cash provided by (used for) investing activities | | | | -776.7 | -423.4 | -1,142.5 | -1,500.7 | 140.0 |
| |
| Cash flows from financing activities: | | | | | | | | |
| Proceeds from Class A common stock issued under the Employee Stock Purchase Plan | | | | 9.6 | 9.7 | 10.1 | 10.1 | 10.0 |
| Net cash provided by (used for) financing activities | | | | -1,078.5 | -180.9 | -15.6 | 21.3 | 9.5 |
| Effect of exchange rates on cash and cash equivalents | | | | 17.4 | 1.6 | -1.4 | -8.5 | -19.9 |
| Net increase (decrease) in cash and cash equivalents | | | | -1,240.1 | -22.7 | -625.1 | -999.3 | 650.4 |