| 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 | 789.7 | 782.1 | 777.4 | 777.4 | 777.4 | 792.6 | 824.1 | 855.8 |
| Revenues growth | 1.6% | -1.3% | -5.7% | -9.2% | -12.4% | -10.0% | -5.5% | -0.8% |
| Expenses | | | | | | | | |
| Depreciation | 240.4 | 235.5 | 231.5 | 232.1 | 232.7 | 236.9 | 250.3 | 264.1 |
| Acquisition-related expenses | 7.6 | 7.5 | 6.6 | 0.3 | | | | 2.3 |
| General and administrative | 18.0 | 18.1 | 15.8 | 15.4 | 14.9 | 16.1 | 16.3 | 17.3 |
| Total Expenses | 291.9 | 286.4 | 279.0 | 272.6 | 272.6 | 472.8 | 487.1 | 511.8 |
| |
| Other income (expense) | | | | | | | | |
| Interest income | 0.3 | 0.6 | 1.0 | 1.4 | 3.6 | 4.3 | 4.9 | 4.6 |
| Interest expense | -261.3 | -265.9 | -265.6 | -261.4 | -248.0 | -228.8 | -223.5 | -226.6 |
| Gain on unhedged interest rate swaps, net | 33.2 | 39.1 | 40.5 | 43.8 | 51.8 | 4.7 | -6.7 | -14.4 |
| Other | -1.6 | -1.6 | -1.3 | -1.1 | -0.8 | -19.0 | -25.6 | -25.9 |
| Non-operating income (expense) | -128.6 | -127.1 | -124.6 | -116.4 | -92.3 | -149.7 | -186.9 | -223.4 |
| Income before income taxes | 369.1 | 368.6 | 373.8 | 388.4 | 412.5 | 170.1 | 150.2 | 120.6 |
| Provision for income taxes | -8.8 | -9.3 | -10.3 | -10.7 | -11.4 | -9.7 | -4.5 | -3.8 |
| Net income | 360.3 | 359.2 | 363.5 | 377.8 | 401.1 | 160.4 | 142.0 | 113.1 |
| Less: Net income attributable to noncontrolling interest | -145.0 | -153.7 | -168.5 | -189.4 | -215.6 | -84.2 | -81.4 | -73.4 |
| Net income attributable to Class A shareholders | 215.3 | 205.5 | 194.9 | 188.3 | 185.5 | 76.1 | 60.6 | 39.7 |
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| 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 | | | | | | | | |