Consolidated Investment Products (Level 3 Valuation Techniques) (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liabilities	11,177,200,000us-gaap_Liabilities	10,293,200,000us-gaap_Liabilities
Two Thousand Twelve And Thereafter [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Probability of Default	2.00%	1.40%
Private Equity Fund, Equity Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Private Equity Fund Assets	273.2
Asset-backed Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Liabilities	5,149,600,000	4,181,700,000
Private Equity Funds, Priced Using Private Market Transactions [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Private Equity Fund Assets	85,000,000	5,800,000
Private Equity Funds, Priced Using NAV Practical Expedient [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Private Equity Fund Assets	410,000,000	442,200,000
Market Comparable [Member] \| Minimum [Member] \| Private Equity Fund, Equity Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative Revenue Multiple	200.00%	100.00%
Derivative Discount Rate	25.00%
Fair Value Inputs, Offered Quotes	27,000,000
Market Comparable [Member] \| Maximum [Member] \| Private Equity Fund, Equity Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative Revenue Multiple	400.00%	500.00%
Derivative Discount Rate	36.00%
Fair Value Inputs, Offered Quotes	104,000,000
Market Comparable [Member] \| Weighted Average [Member] \| Private Equity Fund, Equity Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative Revenue Multiple	400.00%	300.00%
Derivative Discount Rate	30.90%	24.00%
Fair Value Inputs, Offered Quotes	45,900,000
Discounted Cash Flow Valuation Technique [Member] \| LIBOR [Member] \| Minimum [Member] \| Collateralized Loan Obligations [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Probability of Default	0.40%	1.00%
Discounted Cash Flow Valuation Technique [Member] \| LIBOR [Member] \| Maximum [Member] \| Collateralized Loan Obligations [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Probability of Default	2.30%	2.00%
Discounted Cash Flow Valuation Technique [Member] \| LIBOR [Member] \| Weighted Average [Member] \| Collateralized Loan Obligations [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Assumed Default Rate, less than one year	0.40%	1.40%
Assumed Default Rate, more than one year	2.30%	2.00%
Discounted Cash Flow Valuation Technique [Member] \| LIBOR [Member] \| Minimum [Member] \| Collateralized Loan Obligations [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative, Basis Spread on Variable Rate	1.02%	1.23%
Discounted Cash Flow Valuation Technique [Member] \| LIBOR [Member] \| Maximum [Member] \| Collateralized Loan Obligations [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative, Basis Spread on Variable Rate	8.01%	8.64%
Discounted Cash Flow Valuation Technique [Member] \| LIBOR [Member] \| Weighted Average [Member] \| Collateralized Loan Obligations [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Derivative, Basis Spread on Variable Rate	2.28%	2.08%
Third party appraisal [Member] [Domain] \| Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]
Private Equity Fund Assets	5,700,000	0

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Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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