| In millions, except per share items | Jun-30-23 | 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: | | | | | | | | |
| Total Revenues | | 751.5 | 752.4 | 755.1 | 748.1 | 742.7 | 736.0 | 740.3 |
| Total Revenues growth | | 1.2% | 2.2% | 2.0% | -0.5% | -1.8% | 2.4% | 12.6% |
| Expenses: | | | | | | | | |
| Reimbursed expenses | | 2.7 | 2.5 | 2.5 | 1.5 | 1.5 | 1.4 | 1.6 |
| General and administrative expenses | | 30.3 | 30.7 | 29.3 | 29.2 | 26.9 | 28.1 | 27.0 |
| Interest expense | | -65.2 | -65.3 | -67.0 | -66.2 | -64.6 | -61.9 | -60.6 |
| Depreciation and amortization | | 286.4 | 288.0 | 288.1 | 287.1 | 286.5 | 287.9 | 288.6 |
| Other | | 1.4 | 1.8 | 2.1 | 2.1 | 2.4 | 2.1 | 2.1 |
| Total costs and expenses | | 642.5 | 646.1 | 648.5 | 658.2 | 651.5 | 649.1 | 646.1 |
| Income from unconsolidated joint ventures | | 9.5 | 6.0 | 6.8 | 7.0 | 6.5 | 6.4 | 7.9 |
| Loss on extinguishment of debt | | -0.1 | | | | | | |
| Net income | | 284.0 | 277.8 | 279.0 | 122.8 | 96.9 | 92.1 | 238.1 |
| Net income attributable to noncontrolling interests | | -0.6 | -0.4 | -0.4 | -0.4 | -0.4 | -0.7 | -0.8 |
| Net income available to common stockholders | | 283.4 | 277.5 | 278.6 | 122.4 | 96.5 | 91.4 | 237.3 |
| |
| Net income per common share — basic (in usd per share) | | $1.90 | $1.86 | $1.87 | $0.82 | $0.65 | $0.62 | $1.61 |
| Net income per common share — diluted (in usd per share) | | $1.90 | $1.86 | $1.87 | $0.83 | $0.66 | $0.63 | $1.61 |
| |
| Weighted average shares — basic (in shares) | | 148.7 | 148.7 | 148.7 | 148.6 | 148.5 | 148.5 | 148.2 |
| Weighted average shares — diluted (in shares) | | 149.0 | 148.9 | 148.8 | 148.7 | 148.7 | 148.6 | 148.6 |