The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The number of real estate properties owned as of the balance sheet date.

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Direct costs arising from transactions with related parties who are not affiliates or joint Ventures. These costs are categorized as cost of goods sold.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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Remaining ownership percentage retained by investee

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Related Party Transactions (Details) $ in Millions	12 Months Ended
Related Party Transactions (Details) $ in Millions	Dec. 31, 2021 USD ($) board_member property	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jan. 31, 2018
Related party transaction
Number of real estate properties \| property	1,200
Ardent
Related party transaction
Ownership interests in properties accounted for under the equity method	9.80%
Number of board members appointed	1
Eclipse Senior Living
Related party transaction
Ownership interests in properties accounted for under the equity method				34.00%
Number of board members appointed	2
Number of board members	6
Remaining ownership percentage retained by investee	66.00%
Ardent \| Triple-net leased properties
Related party transaction
Number of real estate properties \| property	11
Ardent
Related party transaction
Number of board members appointed	1
Number of board members	10
Atria
Related party transaction
Ownership interests in properties accounted for under the equity method	34.00%
Number of board members appointed	2
Number of board members	6
Atria
Related party transaction
Related party fees \| $	$ 50.8	$ 54.1	$ 61.4
Atria \| Sale Or Transition Of Senior Housing Communities Operated By Related Party
Related party transaction
Related party fees \| $	20.3	1.1	0.7
Ardent
Related party transaction
Revenue from related parties \| $	127.2	122.6	118.8
Eclipse Senior Living (ESL)
Related party transaction
Related party fees \| $	11.8	15.1	14.6
Eclipse Senior Living (ESL) \| Transition Of Operations At Senior Housing Communities
Related party transaction
Related party fees \| $	$ 24.0	$ 5.2	$ 8.2