| In millions, except per share items | Mar-31-23 | Sep-30-22 | 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 |
| REVENUE | | | | | | | | |
| Revenues | | | | | | | | |
| Total revenue | | 424.9 | 433.5 | 429.6 | 425.1 | 383.8 | 352.8 | 332.4 |
| Total revenue growth | | 10.7% | 22.9% | 29.3% | 28.8% | 13.3% | -0.4% | |
| EXPENSES | | | | | | | | |
| Depreciation and amortization | | 97.4 | 96.2 | 94.0 | 92.3 | 94.9 | 94.6 | 95.4 |
| Real estate taxes | | 63.7 | 63.3 | 63.2 | 63.8 | 63.1 | 62.2 | 61.7 |
| Property operating | | 73.1 | 71.2 | 69.4 | 68.5 | 68.1 | 65.9 | 61.9 |
| General and administrative | | 42.5 | 42.8 | 41.6 | 39.2 | 40.4 | 38.9 | 47.5 |
| Total expenses | | 356.6 | 353.8 | 348.8 | 424.7 | 433.2 | 428.2 | 504.7 |
| Gain on sale of real estate | | | 7.3 | | | 18.6 | | 11.7 |
| Interest income | | 0.8 | 0.6 | 0.4 | 0.4 | 0.5 | 0.7 | 1.1 |
| Interest and debt expense | | -57.3 | -56.6 | -57.1 | -57.9 | -61.3 | -64.8 | -68.7 |
| Income (loss) before income taxes | | 79.5 | 98.2 | 98.4 | 109.0 | 58.6 | 22.4 | 28.3 |
| Income tax expense | | -2.5 | -2.6 | -1.8 | -1.1 | 25.0 | 25.2 | 38.9 |
| Net income (loss) | | 77.0 | 95.7 | 96.6 | 107.8 | 83.5 | 47.6 | 67.2 |
| |
| Less net (income) loss attributable to NCI in: | | | | | | | | |
| Operating partnership | | -3.0 | -3.7 | -3.8 | -4.3 | -10.1 | -9.2 | -7.3 |
| Net income (loss) attributable to common shareholders | | 74.9 | 91.3 | 92.3 | 102.7 | 79.2 | 45.8 | 64.5 |
| |
| Earnings per common share - Basic (in dollars per share) | | $0.65 | $0.79 | $0.80 | $0.89 | $0.68 | $0.39 | $0.55 |
| Earnings per common share - Diluted (in dollars per share) | | $0.65 | $0.79 | $0.80 | $0.89 | $0.68 | $0.39 | $0.55 |
| |
| Weighted average shares outstanding - Basic (in shares) | | 117.3 | 117.2 | 117.1 | 117.0 | 117.2 | 117.1 | 117.0 |
| Weighted average shares outstanding - Diluted (in shares) | | 119.5 | 118.4 | 118.3 | 118.2 | 117.3 | 117.1 | 117.0 |
| Net income (loss) | | 77.0 | 95.7 | 96.6 | 107.8 | 83.5 | 47.6 | 67.2 |
| |
| Comprehensive income (loss) | | | | | | | | |
| Less comprehensive loss attributable to NCI in Operating partnership | | 0.0 | 0.0 | | | | | |
| Less net (income) loss attributable to NCI in Operating partnership | | -3.0 | -3.7 | -3.8 | -4.3 | -10.1 | -9.2 | -7.3 |
| Comprehensive income (loss) attributable to common shareholders | | 33.0 | 48.8 | 49.8 | | 40.3 | 12.5 | |