Segment Information (Summary Of Segment Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenue	$ 3,415,824	$ 2,915,068	$ 2,855,108
Cost of operations	(852,030)	(807,543)	(762,416)
Cost of operations	(68,568)	(59,919)	(50,736)
Depreciation and amortization	(713,428)	(553,257)	(512,918)
General and administrative	(101,254)	(83,199)	(62,146)
Interest and other income	12,306	22,323	26,683
Interest expense	(90,774)	(56,283)	(45,641)
Equity in earnings of unconsolidated real estate entities	232,093	80,497	69,547
Foreign currency exchange gain (loss)	111,787	(97,953)	7,829
Gain on sale of real estate	13,683	1,493	341
Net income	1,959,639	1,361,227	1,525,651
Operating Segments
Segment Reporting Information [Line Items]
Net income	1,781,798	1,494,349	1,529,038
Segment Reconciling Items
Segment Reporting Information [Line Items]
General and administrative	(101,254)	(83,199)	(62,146)
Interest and other income	12,306	22,323	26,683
Interest expense	(90,774)	(56,283)	(45,641)
Equity in earnings of unconsolidated real estate entities	232,093	80,497	69,547
Foreign currency exchange gain (loss)	111,787	(97,953)	7,829
Gain on sale of real estate	13,683	1,493	341
Self-Storage Operations Reportable Segment | Operating Segments
Segment Reporting Information [Line Items]
Revenue	3,203,566	2,721,630	2,684,552
Cost of operations	(852,030)	(807,543)	(762,416)
Net operating income	2,351,536	1,914,087	1,922,136
Depreciation and amortization	(713,428)	(553,257)	(512,918)
Net income	1,638,108	1,360,830	1,409,218
Ancillary Operations | Operating Segments
Segment Reporting Information [Line Items]
Revenue	212,258	193,438	170,556
Cost of operations	(68,568)	(59,919)	(50,736)
Net operating income	$ 143,690	$ 133,519	$ 119,820