Consolidated Investment Products (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2017	Dec. 31, 2016
Variable Interest Entity [Line Items]
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	$ 1.0
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	232.5	$ 234.4
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	$ 232.5
Pay interest at Libor or Euribor plus	10.00%
Collateral assets, default percentage	0.44%	0.30%
Notes issued by collateralized loan obligations terms of arrangements interest rate margin spread low	1.15%
Notes issued by collateralized loan obligations terms of arrangements interest rate margin spread high	8.25%
CLO [Member]
Variable Interest Entity [Line Items]
Weighted average maturity (years)	9 years 8 months
Bank Loan Obligations [Member]
Variable Interest Entity [Line Items]
CLO Collateral Assets	$ 4,286.7	$ 4,397.8
Senior Secured Bank Loans And Bonds [Member] \| CLO [Member]
Variable Interest Entity [Line Items]
Fair value, option, aggregate differences, long-term debt instruments	$ 46.4	$ 96.6
Minimum [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity Term	7 years
Maximum [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity Term	12 years
Consolidation, Eliminations [Member] \| Bank Loan Obligations [Member] \| CLO [Member]
Variable Interest Entity [Line Items]
CLO Collateral Assets	$ 4,278.1

Collateral Assets Default Percentage

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Collateralized Loan Obligation, Collateral Assets

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Collateralized Loan Obligations Terms Of Arrangements Interest Rate Margin Spread High

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- Definition

Issued Note Maturity Average Years

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Notes Issued By Collateralized Loan Obligations Terms Of Arrangements Interest Rate Margin Spread High

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Notes Issued By Collateralized Loan Obligations Terms Of Arrangements Interest Rate Margin Spread Low

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- Definition

Variable Interest Entity Term

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No definition available.

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- Definition

Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of long-term debt instruments that have contractual principal amounts and for which the fair value option has been elected.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

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- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=64801991&loc=d3e5728-111685

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
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-Section 50
-Paragraph 6
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=64801991&loc=d3e5747-111685

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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.

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No definition available.

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- Definition

Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

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