| 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 |
| Revenues | | | | | | | | |
| Lease revenue | 150.6 | 142.3 | 141.4 | 119.6 | 145.7 | 136.5 | 137.3 | 139.1 |
| Other property revenue | 1.1 | 1.0 | 0.9 | 0.8 | 0.8 | 0.8 | 0.5 | |
| Construction contract and other service revenues | 167.5 | 185.8 | 195.5 | 163.7 | 174.6 | 157.2 | 154.4 | 164.0 |
| Construction contract and other service revenues growth | -14.3% | 18.2% | 26.6% | -0.2% | 12.8% | 8.6% | 5.9% | 4.0% |
| Total revenues | 167.5 | 185.8 | 195.5 | 163.7 | 174.6 | 157.2 | 154.4 | 164.0 |
| Total revenues growth | -14.3% | 18.2% | 26.6% | -0.2% | 12.8% | 8.6% | 5.9% | 4.0% |
| Operating expenses | | | | | | | | |
| Property operating expenses | 59.4 | 54.1 | 57.2 | | | 50.9 | 53.3 | |
| Depreciation and amortization associated with real estate operations | 37.0 | 34.8 | 34.3 | 26.1 | 36.6 | 34.7 | 34.5 | 36.7 |
| Construction contract and other service expenses | 15.2 | 41.3 | 51.7 | 42.1 | 27.1 | 19.1 | 15.8 | 23.6 |
| General, administrative and leasing expenses | 10.0 | 8.4 | 8.5 | 9.2 | 9.3 | 9.2 | 8.4 | 9.9 |
| Business development expenses and land carry costs | 0.5 | 0.7 | 0.8 | 1.1 | 1.1 | 1.4 | 1.1 | 1.0 |
| Total operating expenses | 122.1 | 139.3 | 152.4 | 123.0 | 131.3 | 115.3 | 113.1 | 123.2 |
| Interest expense | -16.4 | -14.8 | -14.4 | -16.2 | -15.7 | -15.9 | -17.5 | -17.1 |
| Interest and other income | 2.3 | 1.8 | 1.9 | 2.0 | 1.8 | 2.2 | 1.9 | 3.3 |
| Credit loss (expense) recoveries | -0.1 | -0.2 | 0.3 | | | -0.2 | | |
| Loss on early extinguishment of debt | | | -0.3 | -41.1 | -1.2 | -25.2 | -33.2 | -4.1 |
| Income from continuing operations before equity in (loss) income of unconsolidated entities and income taxes | 80.6 | 33.3 | 30.5 | 11.3 | 28.5 | 43.0 | -7.1 | 83.4 |
| Equity in (loss) income of unconsolidated entities | -0.1 | 0.3 | 0.9 | 0.3 | 0.3 | 0.3 | 0.2 | 0.5 |
| Income tax expense | -0.1 | 0.0 | -0.2 | 0.0 | 0.0 | 0.0 | 0.0 | -0.3 |
| Tax rate | 0.2% | 0.0% | 0.5% | 0.4% | 0.2% | 0.1% | | 0.3% |
| Income from continuing operations | 80.4 | 33.6 | 31.3 | 11.6 | 28.8 | 43.2 | -6.9 | 83.5 |
| Discontinued operations | | | 29.6 | | | 0.7 | 0.8 | |
| Net income | 80.4 | 33.6 | 60.8 | 15.0 | 28.8 | 43.9 | -13.0 | 83.5 |
| |
| Net income attributable to noncontrolling interests: | | | | | | | | |
| Common units in COPLP | -1.3 | -0.5 | -0.9 | -0.2 | -0.4 | -0.6 | 0.1 | -1.0 |
| Other consolidated entities | -0.3 | -0.8 | -0.6 | -1.1 | -1.3 | -0.9 | -0.7 | -0.8 |
| Net income attributable to common shareholders | 78.8 | 33.6 | 59.3 | 15.0 | 28.8 | 43.9 | -13.0 | 83.5 |
| |
| Basic earnings per common share: | | | | | | | | |
| Income from continuing operations - basic (in dollars per share) | 0.0 | 0.0 | 0.0 | | | 0.0 | 0.0 | |
| Discontinued operations - basic (in dollars per share) | | | 0.0 | | | 0.0 | 0.0 | |
| |
| Net income attributable to common shareholders - basic (in dollars per share) | $0.70 | $0.29 | $0.53 | $0.12 | $0.24 | $0.38 | ($0.06) | $0.73 |
| |
| Diluted earnings per common share: | | | | | | | | |
| Income from continuing operations - diluted (in dollars per share) | 0.0 | 0.0 | 0.0 | | | 0.0 | 0.0 | |
| Discontinued operations - diluted (in dollars per share) | | | 0.0 | | | 0.0 | 0.0 | |
| Net income attributable to common shareholders - diluted (in dollars per share) | $0.70 | $0.29 | $0.52 | $0.12 | $0.24 | $0.38 | ($0.06) | $0.73 |