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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Number of Potential Board Members

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Number of Board Members Appointed

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Related Party Transactions (Details) $ in Millions	12 Months Ended
Related Party Transactions (Details) $ in Millions	Dec. 31, 2018 USD ($) board_member property	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Related party transaction
Ownership interests in properties accounted for under the equity method	25.00%
Number of real estate properties \| property	1,200
Ardent
Related party transaction
Number of real estate properties \| property	11
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
Ardent
Related party transaction
Ownership interests in properties accounted for under the equity method	9.80%
Number of board members appointed	1
Number of board members	11
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 \| $	$ 60.1	$ 59.7	$ 58.7
Ardent
Related party transaction
Revenue from related parties \| $	114.8	$ 110.8	$ 106.9
Eclipse Senior Living (ESL)
Related party transaction
Related party fees \| $	$ 12.9
Triple Net Leased Properties
Related party transaction
Number of real estate properties \| property	442
Triple Net Leased Properties \| Ardent
Related party transaction
Number of real estate properties \| property	10