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Investments in Unconsolidated Entities (Details) $ in Millions	1 Months Ended		12 Months Ended
	Jul. 31, 2018 USD ($)	Mar. 31, 2018 USD ($) joint_venture	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Equity method investments
Equity Method Investment, Other than Temporary Impairment		$ 35.7
Real Estate Joint Ventures
Equity method investments
Ownership interests in properties accounted for under the equity method	25.00%
Equity investments in an unconsolidated real estate venture with recognized impairment \| joint_venture		1
Proceeds from sale of equity method investments	$ 57.5
Management Service
Equity method investments
Management fees earned			$ 3.4	$ 5.8	$ 6.3
Atria
Equity method investments
Ownership interests in properties accounted for under the equity method			34.00%
Eclipse Senior Living
Equity method investments
Ownership interests in properties accounted for under the equity method			34.00%
Ardent
Equity method investments
Ownership interests in properties accounted for under the equity method			9.80%