| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Revenues | | | | | | | | |
| Lease revenue | 553.7 | 509.1 | 493.2 | 512.3 | 504.9 | | | |
| Other property revenue | 2.9 | 2.6 | 4.9 | | | | | |
| Construction contract and other service revenues | 664.4 | 582.4 | 611.8 | 578.1 | 612.8 | 574.3 | 519.1 | 479.7 |
| Construction contract and other service revenues growth | 14.1% | -4.8% | 5.8% | -5.7% | 6.7% | 10.6% | 8.2% | -3.8% |
| Total revenues | 664.4 | 582.4 | 611.8 | 578.1 | 612.8 | 574.3 | 519.1 | 479.7 |
| Total revenues growth | 14.1% | -4.8% | 5.8% | -5.7% | 6.7% | 10.6% | 8.2% | -3.8% |
| Operating expenses | | | | | | | | |
| Depreciation and amortization associated with real estate operations | 137.5 | 126.5 | 125.0 | 137.1 | 134.2 | 132.7 | 140.0 | 136.1 |
| Construction contract and other service expenses | 104.1 | 67.6 | 110.0 | 58.3 | | | | |
| General, administrative and leasing expenses | 36.1 | 33.0 | 35.4 | 28.9 | 30.8 | 36.6 | 31.4 | 31.8 |
| Business development expenses and land carry costs | 4.6 | 4.5 | 4.2 | 5.8 | 6.2 | 8.2 | | |
| Total operating expenses | 495.7 | 423.9 | 460.4 | 433.6 | 477.0 | 521.9 | 505.4 | 454.9 |
| Interest expense | -65.4 | -67.9 | -71.1 | -75.4 | -77.0 | -83.2 | -89.1 | -92.4 |
| Interest and other income | 7.9 | 8.6 | 7.9 | 4.4 | 6.3 | 5.4 | 4.5 | 4.9 |
| Loss on early extinguishment of debt | -100.6 | -7.3 | | -0.3 | -0.5 | -1.1 | 85.3 | -9.6 |
| Income from continuing operations before equity in (loss) income of unconsolidated entities and income taxes | 77.3 | 99.1 | 193.5 | 75.6 | 74.5 | 33.3 | 120.8 | 34.6 |
| Equity in (loss) income of unconsolidated entities | 1.1 | 1.8 | 1.6 | 2.7 | 1.5 | 0.8 | 0.1 | 0.2 |
| Income tax expense | -0.1 | -0.4 | 0.2 | 0.4 | -1.1 | -0.2 | -0.2 | -0.3 |
| Tax rate | 0.2% | 0.4% | | | 1.5% | 0.7% | 0.2% | 0.9% |
| Income from continuing operations | 78.2 | 100.6 | 195.4 | 78.6 | 74.9 | 33.8 | 120.7 | 34.5 |
| Discontinued operations | 3.4 | 2.3 | 4.7 | | | | 0.2 | 0.0 |
| Net income | 81.6 | 102.9 | 200.0 | 78.6 | 74.9 | 33.8 | 188.9 | 45.2 |
| |
| Net income attributable to noncontrolling interests: | | | | | | | | |
| Common units in COPLP | -1.0 | -1.2 | -2.4 | -1.7 | -1.9 | -0.5 | -6.4 | -1.0 |
| Other consolidated entities | -4.0 | -4.0 | -5.4 | -3.9 | -3.6 | -3.7 | -3.5 | -3.3 |
| Net income attributable to common shareholders | 81.6 | 102.9 | 200.0 | 78.6 | 74.9 | 14.6 | 164.1 | 22.5 |
| |
| 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) | $0.68 | $0.87 | $1.72 | $0.69 | $0.56 | $0.15 | $1.74 | $0.25 |
| |
| 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) | $0.68 | $0.87 | $1.71 | $0.69 | $0.56 | $0.15 | $1.74 | $0.25 |