Preferred Shares, Common Shares and Common Shares in Treasury and Non-Controlling Interests - Common Share Dividends Declared (Detail) - $ / shares		3 Months Ended		12 Months Ended
	Oct. 01, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Equity [Abstract]
Common share cash dividends declared per share	$ 22.29	$ 0.52	$ 0.52	$ 1.04	$ 2.72	$ 2.08
Curbline Properties spin-off stock dividend per share	$ 44.58			$ 44.58	$ 0	$ 0