| In millions, except per share items | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 | Dec-31-20 | Sep-30-20 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Rental and other revenues | 203.8 | 206.4 | 203.2 | 195.5 | 185.5 | 183.8 | 179.9 | 181.0 |
| Rental and other revenues growth | 9.9% | 12.3% | 13.0% | 8.0% | 1.3% | -4.7% | -6.3% | -3.4% |
| Operating expenses: | | | | | | | | |
| Rental property and other expenses | | | 63.5 | 60.6 | | | 57.6 | 56.9 |
| Depreciation and amortization | | | 69.8 | 66.5 | | | 60.7 | 60.3 |
| Impairments of real estate assets | | | | | | | | |
| General and administrative | | | 10.1 | 10.4 | | | 10.9 | 9.2 |
| Total operating expenses | 176.7 | 144.6 | 143.4 | 137.5 | 128.3 | 127.1 | 129.1 | 126.4 |
| Interest expense | | | -25.1 | -22.0 | | | -20.0 | -19.9 |
| Other income/(loss) | | | 0.3 | 0.4 | | | 0.9 | -3.3 |
| Equity in earnings of unconsolidated affiliates | | | 0.3 | 0.5 | | | 1.0 | 0.8 |
| Net income | | | 129.0 | 75.6 | | | 85.3 | 42.3 |
| Net (income) attributable to noncontrolling interests in the Operating Partnership | 1.2 | 1.0 | -3.2 | -2.0 | 1.6 | 1.5 | -2.3 | -1.1 |
| Net (income) attributable to noncontrolling interests in consolidated affiliates | | | -1.7 | | | | -1.2 | |
| Dividends on Preferred Stock | 0.6 | 0.6 | -0.6 | -0.6 | 0.6 | 0.6 | -0.6 | -0.6 |
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| Distributions on Preferred Units | | | | | | | | |
| Net income available for common stockholders | | | 124.9 | 72.1 | | | 82.1 | 40.3 |
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| Net income available for common unitholders | | | | | | | | |
| Earnings per Common Share - basic: | | | | | | | | |
| Net income available for common stockholders (in dollars per share) | $0.48 | $0.38 | $1.19 | $0.69 | $0.57 | $0.52 | $0.79 | $0.39 |
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| Weighted average Common Shares outstanding - basic (in shares) | 105.2 | 104.9 | 104.2 | 104.3 | 104.1 | 104.0 | 103.9 | 103.9 |
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| Earnings per Common Share - diluted: | | | | | | | | |
| Net income available for common stockholders (in dollars per share) | $0.48 | $0.39 | $1.19 | $0.69 | $0.57 | $0.53 | $0.79 | $0.39 |
| Weighted average Common Shares outstanding - diluted (in shares) | 107.2 | 107.0 | 107.1 | 107.1 | 106.6 | 106.4 | 106.7 | 106.7 |
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| Earnings per Common Unit - basic: | | | | | | | | |
| Net income available for common unitholders (in dollars per share) | | | | | | | | |
| Weighted average Common Units outstanding - basic (in shares) | | | | | | | | |
| Earnings per Common Unit - diluted: | | | | | | | | |
| Net income available for common unitholders (in dollars per share) | | | | | | | | |
| Weighted average Common Units outstanding - diluted (in shares) | | | | | | | | |