Equity - Stock Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions										1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Aug. 29, 2024	Aug. 06, 2024	May 07, 2024	Apr. 01, 2024	Mar. 06, 2024	Jan. 11, 2024	Mar. 01, 2023	Mar. 18, 2022	Mar. 11, 2022	Mar. 31, 2024	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2021	Dec. 31, 2020
Restricted stock
Stock-based incentive plan awards
Compensation expense, net of capitalization														$ 14.2	$ 11.7
Restricted stock | Employees
Stock-based incentive plan awards
Awards granted (in units)		824		129,178
Weighted average fair value of shares granted during the year (in dollars per share)		$ 155.54		$ 156.49
Vesting service period (in years)		3 years		3 years
Restricted stock | Non-employee Director
Stock-based incentive plan awards
Awards granted (in units)			14,534			396
Weighted average fair value of shares granted during the year (in dollars per share)			$ 147.95			$ 144.68
Vesting service period (in years)			1 year			1 year
2019 Stock Incentive Plan | Time Based Restricted Stock Units
Stock-based incentive plan awards
Awards granted (in units)					53,679		64,852	52,673	52,673							37,976	312,263
Weighted average fair value of shares granted during the year (in dollars per share)					$ 152.32		$ 121.25	$ 130.84	$ 130.05							$ 112.92	$ 84.37
Vesting rights each year beginning 2022 (as a percent)																	0.3333%
Grant date fair value					$ 8.2		$ 7.9						$ 6.9			$ 4.3	$ 26.3
Vesting service period (in years)					3 years		3 years						3 years			3 years	3 years
LTIP programs
Stock-based incentive plan awards
Percent of distributions of Operating Partnership that participants are entitled to receive during performance period (in %)														10.00%
Compensation expense, net of capitalization														$ 17.0	$ 18.8
2021 LTIP program | LTIP Units
Stock-based incentive plan awards
Performance period (in years)																3 years
LTIP Units Earned										209,784				209,784
Grant date fair value														$ 5.7
Grant date target value														12.2
2022 LTIP program | LTIP Units
Stock-based incentive plan awards
Performance period (in years)													3 years
Grant date target value														13.7
2022 LTIP program | LTIP Units | Maximum
Stock-based incentive plan awards
Grant date fair value													$ 20.6
2023 LTIP program | LTIP Units
Stock-based incentive plan awards
Performance period (in years)												3 years
Grant date target value														23.6
2023 LTIP program | LTIP Units | Maximum
Stock-based incentive plan awards
Grant date fair value												$ 42.5
2024 LTIP program | LTIP Units
Stock-based incentive plan awards
Performance period (in years)											3 years
Grant date fair value											$ 44.1
Grant date target value														$ 24.5
2024 OPI awards | LTIP Units
Stock-based incentive plan awards
Awards granted (in units)	406,976
Weighted average fair value of shares granted during the year (in dollars per share)	$ 165.50
Grant date fair value	$ 67.4
Vesting service period (in years)	5 years
2024 OPI awards | Restricted stock
Stock-based incentive plan awards
Awards granted (in units)	178,931
Weighted average fair value of shares granted during the year (in dollars per share)	$ 165.50
Grant date fair value	$ 29.6
Vesting service period (in years)	4 years