Schedule III - Real Estate Investments - Impairment and Amount that Tax Basis of Net Real Estate Assets Less Than the Reported Amounts (Details) $ in Millions	12 Months Ended
Dec. 31, 2020 USD ($)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
Reduction of costs capitalized	$ 24.9
Reduction of accumulated depreciation	13.5
Tax basis of investments, cost for income tax purposes	$ 4,220.0

The amount of asset retirement costs previously incurred and capitalized separately from the capitalized amount of the associated long-lived assets.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant