| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Rental and other revenues | 828.9 | 768.0 | 736.9 | 736.0 | 720.0 | 702.7 | | 604.7 |
| Rental and other revenues growth | 7.9% | 4.2% | 0.1% | 2.2% | 2.5% | | -100.0% | 8.8% |
| Operating expenses: | | | | | | | | |
| Rental property and other expenses | 259.8 | 236.4 | 231.8 | 248.5 | 242.4 | 236.9 | 231.1 | 215.9 |
| Depreciation and amortization | 287.6 | 259.3 | 241.6 | 254.5 | 230.0 | 227.8 | 220.1 | 201.9 |
| Impairments of real estate assets | 36.5 | | 1.8 | 5.8 | 0.4 | 1.4 | | |
| General and administrative | 42.3 | 40.6 | 41.0 | 44.1 | 40.0 | 39.6 | 38.2 | 37.6 |
| Total operating expenses | 626.2 | 536.2 | 516.2 | 552.9 | 512.8 | 505.8 | 489.4 | 455.5 |
| Interest expense | -105.4 | -85.9 | -81.0 | -81.6 | -71.4 | -69.1 | -3.5 | -3.8 |
| Other income/(loss) | 1.5 | 1.4 | -1.7 | -2.5 | 1.9 | 2.3 | -2.3 | -2.0 |
| Equity in earnings of unconsolidated affiliates | 1.5 | 1.9 | 4.0 | 3.3 | 2.2 | 7.4 | 5.8 | 5.1 |
| Net income | 164.0 | 323.3 | 357.9 | 141.7 | 177.6 | 191.7 | 541.1 | 101.3 |
| Net (income) attributable to noncontrolling interests in the Operating Partnership | -3.7 | -8.3 | -9.3 | -3.6 | -4.6 | -5.1 | -15.6 | -2.9 |
| Net (income) attributable to noncontrolling interests in consolidated affiliates | -1.2 | -1.7 | -1.2 | | | | | |
| Dividends on Preferred Stock | -2.5 | -2.5 | -2.5 | -2.5 | -2.5 | -2.5 | -2.5 | -2.5 |
| |
| Distributions on Preferred Units | | | | | | | | |
| Net income available for common stockholders | 156.6 | 310.8 | 344.9 | 134.4 | 169.3 | 182.9 | 521.8 | 94.6 |
| |
| Net income available for common unitholders | | | | | | | | |
| Earnings per Common Share - basic: | | | | | | | | |
| Net income available for common stockholders (in dollars per share) | $1.49 | $2.98 | $3.32 | $1.30 | $1.64 | $1.78 | $5.30 | $1.00 |
| |
| Weighted average Common Shares outstanding - basic (in shares) | 105.1 | 104.2 | 103.9 | 103.7 | 103.4 | 102.7 | 98.4 | 94.4 |
| |
| Earnings per Common Share - diluted: | | | | | | | | |
| Net income available for common stockholders (in dollars per share) | $1.49 | $2.98 | $3.32 | $1.30 | $1.64 | $1.78 | $5.30 | $1.00 |
| Weighted average Common Shares outstanding - diluted (in shares) | 107.6 | 107.1 | 106.7 | 106.4 | 106.3 | 105.6 | 101.4 | 97.4 |
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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) | | | | | | | | |