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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 04, 2017
Other Commitments [Line Items]
Percentage of capital committed to strategic investments that may be drawn down	100.00%
Positive Outcome of Litigation [Member] | Lennar
Other Commitments [Line Items]
Legal fee recovery, applied amount		$ 17.0

X

- Definition

Represents the percentage of capital committed to strategic investments by the entity that may be drawn down.

+ References

No definition available.

+ Details

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X

- Definition

The amount or range of possible amounts of gain that could be realized upon the resolution of a contingency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6397426&loc=d3e17499-108355

+ Details

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X

- 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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X

- Details

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X

- Details

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