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Subsequent Event (Details)
$ in Millions
Oct. 01, 2019
USD ($)
community
entry_fee
extension_option
Subsequent Event  
Subsequent Event [Line Items]  
Number of additional entry fee | entry_fee 1
Number of communities, acquired, previously leased or managed 18
CCRC Ventures, LLC | CCRCs | Subsequent Event  
Subsequent Event [Line Items]  
Business acquisition, percentage of voting interests acquired 51.00%
Number of entry fee | entry_fee 14
Payments to acquire interest in joint venture | $ $ 1,060.0
Number of communities to be sold at a future date 2
Number of entry fee, sales | entry_fee 2
CCRC Ventures, LLC | CCRCs | Minimum | Subsequent Event  
Subsequent Event [Line Items]  
Number of entry fee, sales, period 12 months
CCRC Ventures, LLC | CCRCs | Maximum | Subsequent Event  
Subsequent Event [Line Items]  
Number of entry fee, sales, period 18 months
HCP, Inc. | CCRCs | Subsequent Event  
Subsequent Event [Line Items]  
Business acquisition, percentage of voting interests acquired 51.00%
Payments (proceeds) for management agreement termination fee | $ $ 100.0
Proceeds from divestiture of business | $ $ 291.0
Master Lease Transactions | Subsequent Event  
Subsequent Event [Line Items]  
Number of continuing communities 24
Operating leases, rent expense | $ $ 41.8
Operating leases, rent expense, annual escalator rate 2.40%
Operating lease, initial lease rate 7.00%
Master Lease Transactions | HCP, Inc.  
Subsequent Event [Line Items]  
Operating lease, capital expenditures, period 5 years
Master Lease Transactions | HCP, Inc. | Subsequent Event  
Subsequent Event [Line Items]  
Payments to acquire interest in joint venture | $ $ 405.5
Number of communities leased 25
Number of communities, acquired, previously leased or managed 18
Number of leases communities transferred to successor operator 1
Number of continuing communities 24
Lessee, operating lease, number of extensions | extension_option 2
Lessee, operating lease, number of extensions, term 10 years
Operating lease, capital expenditures, availability | $ $ 35.0