Segment Information - Assets (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)
Segment Reporting [Abstract]
Number of activity segments | segment	70
Reconciliation of assets from segment to consolidated
Net real estate	$ 32,716,532	$ 31,988,872
Goodwill	3,711,981	3,676,705
Other corporate assets	2,440,870	2,195,800
Total assets	44,062,017	43,137,502
Automotive service
Reconciliation of assets from segment to consolidated
Net real estate	894,082	852,151
Intangible assets	123,378	125,543
Beverages
Reconciliation of assets from segment to consolidated
Net real estate	360,894	362,570
Intangible assets	17,077	17,452
Convenience stores - U.S.
Reconciliation of assets from segment to consolidated
Net real estate	2,896,397	2,844,800
Intangible assets	255,578	275,548
Dollar stores
Reconciliation of assets from segment to consolidated
Net real estate	2,296,944	2,303,906
Intangible assets	348,709	366,319
Drug stores
Reconciliation of assets from segment to consolidated
Net real estate	2,141,458	2,182,432
Intangible assets	345,852	355,779
Financial services
Reconciliation of assets from segment to consolidated
Net real estate	565,437	576,065
Intangible assets	87,572	92,986
General merchandise - U.S.
Reconciliation of assets from segment to consolidated
Net real estate	1,304,448	1,289,735
Intangible assets	251,379	254,343
Grocery stores - U.S.
Reconciliation of assets from segment to consolidated
Net real estate	1,590,169	1,517,237
Intangible assets	370,607	378,181
Grocery stores - U.K.
Reconciliation of assets from segment to consolidated
Net real estate	2,004,833	1,963,057
Intangible assets	443,576	426,714
Health and fitness
Reconciliation of assets from segment to consolidated
Net real estate	1,303,126	1,325,932
Intangible assets	118,271	125,586
Health care - U.S.
Reconciliation of assets from segment to consolidated
Net real estate	671,638	670,864
Intangible assets	100,396	103,143
Home furnishings - U.S.
Reconciliation of assets from segment to consolidated
Net real estate	715,142	583,564
Intangible assets	203,480	210,654
Home improvement - U.S.
Reconciliation of assets from segment to consolidated
Net real estate	956,195	946,870
Intangible assets	206,915	207,637
Home improvement - U.K.
Reconciliation of assets from segment to consolidated
Net real estate	846,093	780,308
Intangible assets	158,519	158,667
Restaurants-casual dining
Reconciliation of assets from segment to consolidated
Net real estate	1,988,707	2,016,017
Intangible assets	402,818	416,653
Restaurants-quick service - U.S.
Reconciliation of assets from segment to consolidated
Net real estate	2,681,001	2,689,806
Intangible assets	247,549	270,092
Theaters - U.S.
Reconciliation of assets from segment to consolidated
Net real estate	738,894	750,877
Intangible assets	32,369	33,527
Transportation services
Reconciliation of assets from segment to consolidated
Net real estate	1,039,295	1,039,220
Intangible assets	119,598	125,971
Wholesale club
Reconciliation of assets from segment to consolidated
Net real estate	873,026	865,658
Intangible assets	156,165	155,032
Other non-reportable segments
Reconciliation of assets from segment to consolidated
Net real estate	6,848,753	6,427,803
Intangible assets	$ 1,202,826	$ 1,176,298