Summary of Significant Accounting Policies - Corporate Function Expense Allocations (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
HCP, Inc. \| General and administrative expenses
Expense allocations
Expense allocations related to certain corporate functions	$ 0.6	$ 4.3	$ 1.1	$ 8.7

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