In millions, except per share items | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 |
| 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
Revenues: | | | | | | | | |
Lease income | 430.0 | 481.7 | 482.5 | 538.1 | | | | |
|
Expenses: | | | | | | | | |
Operating expenses | 64.0 | 68.4 | 74.9 | 84.6 | 85.9 | | | |
Real estate taxes | 72.9 | 73.2 | 73.7 | 82.8 | 81.8 | 82.8 | 78.8 | 71.2 |
Depreciation and amortization | 166.0 | 194.6 | 176.0 | 203.9 | 224.4 | 214.7 | 216.0 | 222.7 |
Provision for impairment of investment properties | 2.6 | 12.3 | 2.1 | 67.0 | 20.4 | 19.9 | 72.2 | |
General and administrative expenses | 38.7 | 40.5 | 42.4 | 40.7 | 44.5 | 50.7 | 34.2 | 31.5 |
Total expenses | 344.2 | 389.0 | 369.0 | 478.9 | 457.0 | 462.9 | 498.0 | 474.0 |
|
Other (expense) income: | | | | | | | | |
Interest expense | -78.5 | -76.6 | -73.7 | -146.1 | -109.7 | -138.9 | -133.8 | -146.8 |
Other income (expense), net | -0.2 | -2.6 | 0.7 | 0.4 | 0.1 | 1.7 | 5.5 | 4.7 |
Net income (loss) | 14.6 | 32.4 | 77.6 | 251.5 | | 125.6 | 43.3 | -29.2 |
Net loss attributable to noncontrolling interests | | | | | | -0.5 | | |
Net income (loss) attributable to common shareholders | 14.6 | 32.4 | 77.6 | 251.5 | 166.8 | 125.1 | 43.3 | 13.6 |
|
Earnings (loss) per common share – basic and diluted: | | | | | | | | |
Net income (loss) per common share attributable to common shareholders | $0.07 | $0.15 | $0.35 | $1.03 | $0.66 | $0.49 | $0.14 | $0.02 |
Net income (loss) | 14.6 | 32.4 | 77.6 | 251.5 | | 125.6 | 43.3 | -29.2 |
|
Other comprehensive income (loss): | | | | | | | | |
Net unrealized gain (loss) on derivative instruments (Note 8) | | | | | | | | |
Comprehensive income (loss) | | | | | | | | |
Comprehensive income (loss) attributable to the Company | -4.9 | 21.6 | 75.0 | 251.8 | 167.6 | 125.5 | 43.5 | 14.1 |
|
Weighted average number of common shares outstanding – basic | 213.3 | 212.9 | 217.8 | 230.7 | 236.7 | 236.4 | 236.2 | 234.1 |
Weighted average number of common shares outstanding – diluted | 213.3 | 213.2 | 218.2 | 230.9 | 237.0 | 236.4 | 236.2 | 234.1 |