Provision for Impairment of Investment Properties - Impairment Indicators (Details)	Jun. 30, 2020 property
Impaired Long-Lived Assets Held and Used [Line Items]
Number of properties for which indicators of impairment were identified	2
Number of properties for which an impairment charge was recorded	0
Number of properties held for sale with impairment indicators but not impaired	0
Remaining properties with impairment indicators but not impaired	2
Weighted average percentage by which projected undiscounted cash flows exceeded carrying value for remaining properties	166.00%