Real Estate and Other Activities - Summary of Operating Results from Properties Sold (parenthetical) (Details) $ in Millions	3 Months Ended
Mar. 31, 2022 USD ($)
Disposal Group, Not Discontinued Operations [Member]
Straight-line rent write-offs	$ 4.5
Gains	451.6
Massachusetts-based General Acute Care Hospitals [Member]
Straight-line rent write-offs	$ 125.0

The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration