Variable Interest Entities and Noncontrolling Interests - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2018 USD ($) joint_venture	Dec. 31, 2017 USD ($) joint_venture
Noncontrolling Interest [Line Items]
Number of joint ventures \| joint_venture	13	13
Consolidated variable interest entities, assets	$ 202.3	$ 219.6
Consolidated variable interest entities, liabilities	92.1	99.4
Cash
Noncontrolling Interest [Line Items]
Consolidated variable interest entities, assets	6.9	10.7
Real estate
Noncontrolling Interest [Line Items]
Consolidated variable interest entities, assets	$ 224.8	$ 230.8

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.

No definition available.

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- Definition

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5710-111685

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- Definition

The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

+ References

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- Definition

Number Of Joint Ventures Formed

+ References

No definition available.

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