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Commitments and Contingencies - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) ground_lease | Dec. 31, 2019 USD ($)
Long-term Purchase Commitment [Line Items] |  |
Commitments for contracts and executed leases, operating and redevelopment and development properties | $ 614.9 |
Weighted average discount rate | 5.11% |
Weighted average remaining lease term | 54 years |
Variable lease, cost | $ 3.0 | $ 2.9
Period after which ground lease rentals are adjusted based on fair market value and the Consumer Price Index | 5 years |
Annual ground lease rental obligations limit | $ 1.0 |
Duration of ground lease prior to increase five years | five years |
Average annual percentage rent for previous five years (percent) | 50.00% |
Duration of ground lease prior to increase ten years | 10 years |
Average annual percentage rent for previous ten years (percent) | 60.00% |
Ground lease fixed ground rent increase, percent | 5.00% |
Ten year ground lease extension option [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
Number of extension options | ground_lease | 3 |
Ground lease extension option term | 10 years |
Forty-five year ground lease extension option [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
Number of extension options | ground_lease | 1 |
Ground lease extension option term | 45 years |
Environmental matters [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
Accrued environmental remediation liabilities | $ 71.3 | $ 80.7

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
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