Summary of Significant Accounting Policies - Principles of Consolidation (Details) $ in Millions	Jun. 30, 2017 USD ($)
Variable Interest Entity [Line Items]
Consolidated VIEs, assets	$ 4,600.0
Consolidated VIEs, liabilities	4,500.0
Collateralized Loan Obligations
Variable Interest Entity [Line Items]
Investments in CLOs	$ 194.1

Total of investments in CLOs that were consolidated.

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=64801991&loc=d3e5710-111685

+ Details

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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

+ Details

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- 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.

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