| In millions, except per share items | Mar-31-23 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 | Dec-31-20 |
| | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K |
| Cash flows from operating activities: | | | | | | | | |
| Net income (loss) | | 242.1 | 451.9 | 525.9 | 643.6 | 522.1 | 295.1 | 428.3 |
| Adjustments to reconcile net income (loss) to net cash from (used in) operating activities: | | | | | | | | |
| Stock-based compensation amortization expense | | 18.8 | 18.6 | 18.2 | 17.9 | 17.9 | 16.9 | 17.4 |
| Amortization of deferred financing costs | | 10.3 | 9.7 | 9.2 | 9.2 | 9.4 | 9.8 | 10.2 |
| Straight-line rents | | -39.7 | -33.2 | -31.2 | -24.1 | -25.3 | -27.4 | -24.5 |
| Equity loss (income) from unconsolidated joint ventures | | -6.7 | -12.4 | -11.2 | 9.7 | 31.6 | 54.8 | 67.8 |
| Distributions of earnings from unconsolidated joint ventures | | 1.4 | 5.0 | 5.0 | 5.1 | 4.7 | 3.0 | 12.3 |
| Loss (gain) on sales of real estate, net | | -64.9 | -349.4 | -605.3 | -901.1 | -859.9 | -645.3 | -550.5 |
| Casualty-related loss (recoveries), net | | 0.6 | | | 1.6 | 1.5 | 1.3 | |
| Changes in: | | | | | | | | |
| Decrease (increase) in accounts receivable and other assets, net | | -3.6 | 2.9 | 18.6 | 20.4 | 35.1 | 31.9 | 15.3 |
| Increase (decrease) in accounts payable, accrued liabilities, and deferred revenue | | 98.6 | 85.9 | 7.8 | 33.5 | 36.4 | 37.3 | 93.5 |
| Net cash provided by (used in) operating activities | | 885.3 | 866.7 | 795.2 | 790.0 | 798.2 | 786.1 | 758.4 |
| |
| Cash flows from investing activities: | | | | | | | | |
| Acquisitions of real estate | | -1,144.1 | -1,602.2 | -1,483.0 | -1,808.7 | -1,367.8 | -1,165.5 | -1,170.7 |
| Development, redevelopment, and other major improvements of real estate | | -695.1 | -653.5 | -610.6 | -644.6 | -682.2 | -717.5 | -791.6 |
| Investments in unconsolidated joint ventures | | -17.1 | -20.8 | -25.3 | -42.2 | -47.3 | -43.3 | -39.1 |
| Distributions in excess of earnings from unconsolidated joint ventures | | 8.6 | 30.7 | 37.6 | 49.5 | 49.9 | 26.7 | 18.6 |
| Net cash provided by (used in) investing activities | | -1,642.4 | -482.7 | 531.0 | 962.5 | 1,239.9 | -89.0 | -1,007.7 |
| |
| Cash flows from financing activities: | | | | | | | | |
| Issuances and borrowings of term loans, senior unsecured notes, and mortgage debt | | | | 1,088.5 | 591.5 | 142.1 | | |
| Payments for debt extinguishment and deferred financing costs | | | | | | | | |
| Issuance of common stock and exercise of options, net of offering costs | | 3.9 | 3.9 | 5.0 | 5.9 | 2.9 | 3.5 | 1,068.9 |
| Repurchase of common stock | | -12.0 | -12.0 | -12.8 | -12.8 | -13.0 | -13.0 | -10.5 |
| Dividends paid on common stock | | -649.3 | -649.4 | -650.1 | -687.6 | -725.1 | -762.7 | -787.1 |
| Distributions to and purchase of noncontrolling interests | | -92.4 | -93.1 | -93.3 | -42.1 | -42.1 | -39.9 | -40.6 |
| Contributions from and issuance of noncontrolling interests | | 1.2 | 0.9 | 0.6 | 0.4 | | | |
| Net cash provided by (used in) financing activities | | 648.7 | -382.9 | -1,288.5 | -1,783.2 | -2,630.4 | -1,439.1 | 246.5 |