Accounting Policies and Related Matters - Spot Occupancy (Details) - Seniors Housing Operating - COVID-19	Sep. 30, 2020	Aug. 31, 2020	Jul. 31, 2020	Jun. 30, 2020	May 31, 2020	Apr. 30, 2020	Mar. 31, 2020	Feb. 29, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Spot occupancy	78.40%	78.70%	79.20%	79.90%	80.80%	82.50%	84.80%	85.60%
Sequential occupancy change	(0.30%)	(0.50%)	(0.70%)	(0.90%)	(1.70%)	(2.30%)	(0.80%)