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Real Estate (Significant Acquisition and Disposition) (Details) $ in Millions			3 Months Ended
	Mar. 12, 2026 USD ($) ft² notesReceivable shares	Jan. 06, 2026 USD ($)	Mar. 31, 2026 USD ($)
One of our ground leases at Bethesda Row
Significant Acquisition and Disposition
Purchase price of real estate acquisition		$ 2.5
Congressional North Shopping Center
Significant Acquisition and Disposition
Purchase price of real estate acquisition	$ 72.3
Square footage of real estate property \| ft²	217,000
Mortgage notes receivable repaid with property acquisition, number \| notesReceivable	2
Below market leases	$ 1.5
Congressional North Shopping Center \| downREIT OP units
Significant Acquisition and Disposition
Issuance of downREIT partnership units at acquisition \| shares	2,513
Congressional North Shopping Center \| Acquired lease costs
Significant Acquisition and Disposition
Acquired lease costs	$ 5.2
Congressional North Shopping Center \| Above market leases
Significant Acquisition and Disposition
Above market leases	$ 0.1
A residential building at our Santana Row property and our Courthouse Center retail property
Significant Acquisition and Disposition
Sales price of real estate			$ 158.5
Gain on sale of real estate			$ 92.2