Commitments and Contingencies (Details Textual) $ in Millions	3 Months Ended
Mar. 31, 2021 USD ($)
Commitments related to development, redevelopment and capital improvement activities [Member]
Long-term Purchase Commitment [Line Items]
Commitments related to capital spending activities	$ 266.4
Time Period of Long-term Purchase Commitment	12 months
Commitments related to operations [Member] \| IQHQ [Member]
Long-term Purchase Commitment [Line Items]
Commitment for additional funding to IQHQ	$ 37.5
Commitments related to operations [Member] \| RET Ventures [Member]
Long-term Purchase Commitment [Line Items]
Commitment for additional funding to IQHQ	$ 1.1
Commitments related to operations [Member] \| Maximum [Member]
Long-term Purchase Commitment [Line Items]
Time Period of Long-term Purchase Commitment	1 year

Amount of financial support to be provided in future by investment company to investee.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66023616&loc=SL35737436-115832

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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