| In millions, except per share items | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 | Dec-31-20 | Sep-30-20 | Jun-30-20 |
| | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q |
| Revenues | 201.9 | 199.0 | 194.3 | 194.3 | 194.3 | 194.3 | 194.3 | 194.3 |
| Revenues growth | 3.9% | 2.4% | 0.0% | 0.0% | -7.3% | -14.0% | -14.0% | -13.9% |
| Expenses | | | | | | | | |
| Depreciation | 62.8 | 62.2 | 57.6 | 57.8 | 57.9 | 58.2 | 58.2 | 58.4 |
| Property transactions, net | 1.5 | | | | 0.8 | | | |
| Ground lease expense | 5.8 | | | | 5.9 | | | |
| Acquisition-related expenses | 0.1 | 0.9 | 6.3 | 0.3 | | | | 0.4 |
| General and administrative | 3.6 | 6.2 | 3.9 | 4.3 | 3.7 | 4.0 | 3.5 | 3.7 |
| Total Expenses | 73.9 | 75.7 | 74.0 | 68.3 | 68.4 | 68.3 | 67.6 | 68.3 |
| |
| Other income (expense) | | | | | | | | |
| Interest income | 0.0 | 0.1 | 0.1 | 0.1 | 0.3 | 0.4 | 0.5 | 2.3 |
| Interest expense | -63.8 | -64.5 | -64.2 | -68.7 | -68.4 | -64.2 | -60.0 | -55.4 |
| Gain on unhedged interest rate swaps, net | 29.2 | 6.1 | 4.4 | -6.5 | 35.1 | 7.5 | 7.7 | 1.6 |
| Other | -0.1 | -0.5 | -0.2 | -0.7 | -0.2 | -0.2 | 0.0 | -0.4 |
| Non-operating income (expense) | -9.3 | -33.9 | -34.8 | -50.6 | -7.8 | -31.5 | -26.6 | -26.5 |
| Income before income taxes | 118.8 | 89.4 | 85.5 | 75.5 | 118.2 | 94.6 | 100.1 | 99.5 |
| Provision for income taxes | -2.3 | -2.4 | -2.4 | -1.8 | -2.8 | -3.4 | -2.7 | -2.5 |
| Net income | 116.5 | 87.0 | 83.1 | 73.7 | 115.4 | 91.3 | 97.4 | 97.0 |
| Less: Net income attributable to noncontrolling interest | -47.1 | -35.0 | -33.1 | -29.8 | -55.8 | -49.8 | -54.0 | -56.0 |
| Net income attributable to Class A shareholders | 69.4 | 52.0 | 50.0 | 43.9 | 59.6 | 41.5 | 43.4 | 41.0 |
| |
| Weighted average Class A shares outstanding | | | | | | | | |
| Basic (in shares) | | | | | | | | |
| Diluted (in shares) | | | | | | | | |
| Earnings per Class A share | | | | | | | | |
| Basic (in usd per share) | | | | | | | | |
| Diluted (in usd per share) | | | | | | | | |
| Weighted average units outstanding | | | | | | | | |
| Basic (in shares) | | | | | | | | |
| Diluted (in shares) | | | | | | | | |
| Net income (loss) per Operating Partnership unit (Basic) (in dollars per share) | | | | | | | | |
| Net income | | | | | | | | |