Consolidated Investment Products (Fair Value Hierarchy Levels Of Investments Held And Notes Issued By Consolidated Investment Products) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
CLO-related derivative assets		$ 10.8
Total assets at fair value	1,786.6	1,752.2
Liabilities	(8,443.4)	(10,209.4)
CLO-related derivative liabilities		(5.8)
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Private Equity Fund Assets	21.0	11.4
CLO-related derivative assets		0
Total assets at fair value	1,776.1	1,751.1
CLO-related derivative liabilities		0
Derivative Liability, Fair Value, Gross Liability	0	0
Significant Other Observable Inputs (Level 2) [Member]
Private Equity Fund Assets	9.9	0.1
CLO-related derivative assets		10.8
Total assets at fair value	1.8	1.1
CLO-related derivative liabilities		(5.8)
Derivative Liability, Fair Value, Gross Liability	0	5.8
Significant Unobservable Inputs (Level 3) [Member]
Real Estate Investments, Net	5.3
Private Equity Fund Assets	94.1	126.7
CLO-related derivative assets		0
Total assets at fair value	8.7	0
CLO-related derivative liabilities		0
Derivative Liability, Fair Value, Gross Liability	3,899.4	5,512.9
Fair Value [Member]
Private Equity Fund Assets	125.0	138.2
Derivative Liability, Fair Value, Gross Liability	3,899.4	5,518.7
Bank Loans [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
CLO Collateral Assets	0	0
Bank Loans [Member] \| Significant Other Observable Inputs (Level 2) [Member]
CLO Collateral Assets	3,709.3	5,354.3
Bank Loans [Member] \| Significant Unobservable Inputs (Level 3) [Member]
CLO Collateral Assets	0	0
Bank Loans [Member] \| Fair Value [Member]
CLO Collateral Assets	3,709.3	5,354.3
Bonds [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
CLO Collateral Assets	0	0
Bonds [Member] \| Significant Other Observable Inputs (Level 2) [Member]
CLO Collateral Assets	185.4	292.8
Bonds [Member] \| Significant Unobservable Inputs (Level 3) [Member]
CLO Collateral Assets	0	0
Bonds [Member] \| Fair Value [Member]
CLO Collateral Assets	185.4	292.8
Equity Securities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
CLO Collateral Assets	0	0
Equity Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
CLO Collateral Assets	12.1	35.3
Equity Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
CLO Collateral Assets	0	0
Equity Securities [Member] \| Fair Value [Member]
CLO Collateral Assets	12.1	35.3
Private Equity Funds, Priced Using NAV Practical Expedient [Member] \| Fair Value [Member]
Private Equity Fund Assets	503.5	559.5
Debt Securities [Member]
Investments fair value		10.0
Debt Securities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Investments fair value		0
Debt Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Investments fair value		0
Debt Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Investments fair value		10.0
Investments in Other Private Equity Funds [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Private Equity Fund Assets	0	0
Investments in Other Private Equity Funds [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Private Equity Fund Assets	0	0
Investments in Other Private Equity Funds [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Private Equity Fund Assets	503.5	559.5
Debt Securities Issued By U.S. Treasury [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Private Equity Fund Assets	10.0	6.0
Debt Securities Issued By U.S. Treasury [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Private Equity Fund Assets	0	0
Debt Securities Issued By U.S. Treasury [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Private Equity Fund Assets	0	0
Debt Securities Issued By U.S. Treasury [Member] \| Fair Value [Member]
Private Equity Fund Assets	10.0	6.0
Real Estate Investment [Member]
Investments fair value		232.9
Real Estate Investment [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Investments fair value	0	0
Real Estate Investment [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Investments fair value	0	0
Real Estate Investment [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Investments fair value	5.3	232.9
Asset-backed Securities [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Liabilities	0	0
Asset-backed Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Liabilities	0	0
Asset-backed Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Liabilities	(3,899.4)	(5,512.9)
Asset-backed Securities [Member] \| Fair Value [Member]
Liabilities	(3,899.4)	(5,512.9)
Consolidated Investment Products [Member]
Liabilities	(3,994.8)	(5,668.4)
Consolidated Investment Products [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Total assets at fair value	31.0	17.4
Consolidated Investment Products [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Total assets at fair value	3,916.7	5,693.3
Consolidated Investment Products [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Total assets at fair value	602.9	929.1
Consolidated Investment Products [Member] \| Fair Value [Member]
Total assets at fair value	$ 4,550.6	$ 6,639.8

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- Definition

Private Equity Fund Assets

+ References

No definition available.

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

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-Topic 820

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Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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Amount of real estate investments, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; (7) other real estate investments; (8) real estate joint ventures; and (9) unconsolidated real estate and other joint ventures not separately presented.

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