Fair Value Disclosures (Quantitative Information About Significant Unobservable Inputs Used In Level 3 Fair Value Measurements) (Details) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016 USD ($) T / d $ / shares	Dec. 31, 2015 USD ($) $ / shares	Mar. 31, 2016 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Financial Instruments Owned, Derivatives and Other Contractual Agreements	$ 330,977	$ 262,799
Discount rate	11.50%
Loans [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Trading Liabilities	$ 1,896	10,469	$ 7,744	$ 10,732	$ 9,327	$ 14,450
Corporate Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Financial Instruments Owned	48,816	40,906	30,540	20,547	18,210	20,964
Corporate Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Financial Instruments Owned	24,113	25,876	25,634	31,917	24,795	22,766
Collateralized Debt Obligations [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Financial Instruments Owned	52,710	85,092	67,348	89,007	96,837	124,650
Residential Mortgage-Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Financial Instruments Owned	63,308	70,263	68,019	88,695	79,953	82,557
Commercial Mortgage-Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Financial Instruments Owned	24,983	14,326	21,994	17,862	24,629	26,655
Other Asset-Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Financial Instruments Owned	43,033	42,925	33,124	11,857	7,146	2,294
Loans and other receivables [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Financial Instruments Owned	104,399	189,289	155,442	108,756	111,410	97,258
Investments at Fair Value [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Financial Instruments Owned	273,271	199,794	275,389	154,862	151,365	77,047
Investment in FXCM [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Financial Instruments Owned	508,400	625,689	$ 564,800	$ 759,000	$ 947,000	$ 0
Financial Instruments Owned [Member] | Corporate Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Financial Instruments Owned	43,622	20,285
Financial Instruments Owned [Member] | Corporate Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Financial Instruments Owned	24,113	20,257
Financial Instruments Owned [Member] | Collateralized Debt Obligations [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Financial Instruments Owned	33,406	49,923
Financial Instruments Owned [Member] | Residential Mortgage-Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Financial Instruments Owned	63,308	70,263
Financial Instruments Owned [Member] | Commercial Mortgage-Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Financial Instruments Owned	24,983	14,326
Financial Instruments Owned [Member] | Other Asset-Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Financial Instruments Owned	21,571	21,463
Financial Instruments Owned [Member] | Loans and other receivables [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Financial Instruments Owned	103,059	161,470
Financial Instruments Owned [Member] | Derivatives, Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Financial Instruments Owned		19,785
Financial Instruments Owned [Member] | Investments at Fair Value [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Financial Instruments Owned	30,196	29,940
Financial Instruments Owned [Member] | Investment in FXCM [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Financial Instruments Owned	508,400	625,700
Fair Value of Senior Secured Term Loan Receivable	209,400	203,700
Fair Value of Financial Instruments Owned, Derivatives and Other Contractual Agreements	299,000	422,000
Securities Sold, Not yet Purchased [Member] | Derivatives, Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Trading Liabilities		19,543
Securities Sold, Not yet Purchased [Member] | Loans [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Trading Liabilities	1,896	$ 10,469
Derivative [Member] | Financial Instruments Owned [Member] | Derivatives, Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Financial Instruments Owned	16,311
Derivative [Member] | Securities Sold, Not yet Purchased [Member] | Derivatives, Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value of Trading Liabilities	$ 20,735
Level 3 [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Corporate Equity Securities [Member] | Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Underlying stock price | $ / shares	$ 1
Level 3 [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Corporate Equity Securities [Member] | Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Underlying stock price | $ / shares	$ 102
Level 3 [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Corporate Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Transaction level | $ / shares		$ 59
Level 3 [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
EBITDA (a) multiple		10.0
Level 3 [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount rate/yield	2.00%
Yield		2.00%
Level 3 [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount rate/yield	10.00%
Yield		17.00%
Level 3 [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Weighted Average [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount rate/yield	8.00%
Yield		12.00%
Level 3 [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Investments at Fair Value [Member] | Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount rate	15.00%
Level 3 [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Investments at Fair Value [Member] | Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount rate	30.00%
Level 3 [Member] | Option Pricing Model [Member] | Financial Instruments Owned [Member] | Investment in FXCM [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Volatility	85.00%	110.00%
Level 3 [Member] | Scenario Analysis [Member] | Financial Instruments Owned [Member] | Corporate Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Estimated recovery percentage	6.30%
Level 3 [Member] | Scenario Analysis [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Estimated recovery percentage	6.00%	6.00%
Level 3 [Member] | Scenario Analysis [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Estimated recovery percentage	100.00%	100.00%
Level 3 [Member] | Scenario Analysis [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Weighted Average [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Estimated recovery percentage	56.00%	83.00%
Level 3 [Member] | Convertible Bond Model [Member] | Financial Instruments Owned [Member] | Corporate Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount rate/yield	10.00%	86.00%
Volatility	40.00%
Level 3 [Member] | Comparable Pricing [Member] | Financial Instruments Owned [Member] | Corporate Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount rate	91.00%
Level 3 [Member] | Comparable Pricing [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Comparable loan price | $ / shares	$ 99
Level 3 [Member] | Comparable Pricing [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Comparable loan price | $ / shares		$ 99
Level 3 [Member] | Comparable Pricing [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Comparable loan price | $ / shares		100
Level 3 [Member] | Comparable Pricing [Member] | Financial Instruments Owned [Member] | Loans and other receivables [Member] | Weighted Average [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Comparable loan price | $ / shares		$ 99.7
Level 3 [Member] | Discounted Cash Flows [Member] | Financial Instruments Owned [Member] | Collateralized Debt Obligations [Member] | Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Constant prepayment rate	10.00%	5.00%
Constant default rate	2.00%	2.00%
Loss severity	25.00%	25.00%
Yield	5.00%	6.00%
Level 3 [Member] | Discounted Cash Flows [Member] | Financial Instruments Owned [Member] | Collateralized Debt Obligations [Member] | Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Constant prepayment rate	20.00%	20.00%
Constant default rate	8.00%	8.00%
Loss severity	70.00%	90.00%
Yield	22.00%	13.00%
Level 3 [Member] | Discounted Cash Flows [Member] | Financial Instruments Owned [Member] | Collateralized Debt Obligations [Member] | Weighted Average [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Constant prepayment rate	19.00%	13.00%
Constant default rate	3.00%	2.00%
Loss severity	30.00%	52.00%
Yield	17.00%	10.00%
Level 3 [Member] | Discounted Cash Flows [Member] | Financial Instruments Owned [Member] | Residential Mortgage-Backed Securities [Member] | Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Constant prepayment rate	0.00%	0.00%
Constant default rate	1.00%	1.00%
Loss severity	15.00%	25.00%
Yield	1.00%	1.00%
Level 3 [Member] | Discounted Cash Flows [Member] | Financial Instruments Owned [Member] | Residential Mortgage-Backed Securities [Member] | Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Constant prepayment rate	50.00%	50.00%
Constant default rate	50.00%	9.00%
Loss severity	85.00%	70.00%
Yield	9.00%	9.00%
Level 3 [Member] | Discounted Cash Flows [Member] | Financial Instruments Owned [Member] | Residential Mortgage-Backed Securities [Member] | Weighted Average [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Constant prepayment rate	15.00%	13.00%
Constant default rate	5.00%	3.00%
Loss severity	45.00%	39.00%
Yield	5.00%	6.00%
Level 3 [Member] | Discounted Cash Flows [Member] | Financial Instruments Owned [Member] | Commercial Mortgage-Backed Securities [Member] | Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Yield	7.00%	7.00%
Cumulative loss rate	1.00%	2.00%
Level 3 [Member] | Discounted Cash Flows [Member] | Financial Instruments Owned [Member] | Commercial Mortgage-Backed Securities [Member] | Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Yield	17.00%	30.00%
Cumulative loss rate	71.00%	63.00%
Level 3 [Member] | Discounted Cash Flows [Member] | Financial Instruments Owned [Member] | Commercial Mortgage-Backed Securities [Member] | Weighted Average [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Yield	11.00%	16.00%
Cumulative loss rate	17.00%	23.00%
Level 3 [Member] | Discounted Cash Flows [Member] | Financial Instruments Owned [Member] | Other Asset-Backed Securities [Member] | Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Constant prepayment rate	0.00%	6.00%
Constant default rate	0.00%	3.00%
Loss severity	0.00%	55.00%
Yield	3.00%	7.00%
Level 3 [Member] | Discounted Cash Flows [Member] | Financial Instruments Owned [Member] | Other Asset-Backed Securities [Member] | Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Constant prepayment rate	30.00%	8.00%
Constant default rate	30.00%	5.00%
Loss severity	100.00%	75.00%
Yield	22.00%	22.00%
Level 3 [Member] | Discounted Cash Flows [Member] | Financial Instruments Owned [Member] | Other Asset-Backed Securities [Member] | Weighted Average [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Constant prepayment rate	17.00%	7.00%
Constant default rate	10.00%	4.00%
Loss severity	67.00%	62.00%
Yield	11.00%	18.00%
Level 3 [Member] | Discounted Cash Flows [Member] | Financial Instruments Owned [Member] | Investment in FXCM [Member] | Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Term based on the pay off	0 months	0 months
Level 3 [Member] | Discounted Cash Flows [Member] | Financial Instruments Owned [Member] | Investment in FXCM [Member] | Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Term based on the pay off	1 year	1 year
Level 3 [Member] | Discounted Cash Flows [Member] | Financial Instruments Owned [Member] | Investment in FXCM [Member] | Weighted Average [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Term based on the pay off	8 months	4 months 24 days
Level 3 [Member] | Over Collateralization Percentage Valuation Technique [Member] | Financial Instruments Owned [Member] | Other Asset-Backed Securities [Member] | Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Over-collateralization percentage		117.00%
Level 3 [Member] | Over Collateralization Percentage Valuation Technique [Member] | Financial Instruments Owned [Member] | Other Asset-Backed Securities [Member] | Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Over-collateralization percentage		125.00%
Level 3 [Member] | Over Collateralization Percentage Valuation Technique [Member] | Financial Instruments Owned [Member] | Other Asset-Backed Securities [Member] | Weighted Average [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Over-collateralization percentage		118.00%
Level 3 [Member] | Derivative [Member] | Credit Default Swap [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Derivatives, Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Credit spread	2.90%
Level 3 [Member] | Derivative [Member] | Commodity Forward [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Derivatives, Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount rate/yield		47.00%
Transaction level | $ / shares		$ 9,500,000
Level 3 [Member] | Derivative [Member] | Commodity Forward [Member] | Present Value [Member] | Financial Instruments Owned [Member] | Derivatives, Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Average silver production tons per day | T / d	783
Level 3 [Member] | Derivative [Member] | Equity Option [Member] | Option Pricing Model [Member] | Securities Sold, Not yet Purchased [Member] | Derivatives, Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Volatility	45.00%	45.00%
Level 3 [Member] | Derivative [Member] | Equity Option [Member] | Default Rate [Member] | Securities Sold, Not yet Purchased [Member] | Derivatives, Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Default probability	0.00%	0.00%
Level 3 [Member] | Derivative [Member] | Unfunded Commitments [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Derivatives, Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Credit spread		2.98%
Level 3 [Member] | Derivative [Member] | Unfunded Commitments [Member] | Market Approach [Member] | Securities Sold, Not yet Purchased [Member] | Minimum [Member] | Derivatives, Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount rate/yield	4.00%	3.00%
Level 3 [Member] | Derivative [Member] | Unfunded Commitments [Member] | Market Approach [Member] | Securities Sold, Not yet Purchased [Member] | Maximum [Member] | Derivatives, Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount rate/yield	52.00%	10.00%
Level 3 [Member] | Derivative [Member] | Unfunded Commitments [Member] | Market Approach [Member] | Securities Sold, Not yet Purchased [Member] | Weighted Average [Member] | Derivatives, Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount rate/yield	48.00%	10.00%
Level 3 [Member] | Derivative [Member] | Unfunded Commitments [Member] | Comparable Pricing [Member] | Financial Instruments Owned [Member] | Derivatives, Assets [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Comparable loan price | $ / shares		$ 100
Level 3 [Member] | Derivative [Member] | Unfunded Commitments [Member] | Comparable Pricing [Member] | Securities Sold, Not yet Purchased [Member] | Derivatives, Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Comparable loan price | $ / shares	$ 99
Level 3 [Member] | Derivative [Member] | Unfunded Commitments [Member] | Comparable Pricing [Member] | Securities Sold, Not yet Purchased [Member] | Minimum [Member] | Derivatives, Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Comparable loan price | $ / shares		79
Level 3 [Member] | Derivative [Member] | Unfunded Commitments [Member] | Comparable Pricing [Member] | Securities Sold, Not yet Purchased [Member] | Maximum [Member] | Derivatives, Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Comparable loan price | $ / shares		100
Level 3 [Member] | Derivative [Member] | Unfunded Commitments [Member] | Comparable Pricing [Member] | Securities Sold, Not yet Purchased [Member] | Weighted Average [Member] | Derivatives, Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Comparable loan price | $ / shares		$ 82.6
Level 3 [Member] | Derivative [Member] | Unfunded Commitments [Member] | Discounted Cash Flows [Member] | Securities Sold, Not yet Purchased [Member] | Derivatives, Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Constant prepayment rate		20.00%
Constant default rate		2.00%
Loss severity		25.00%
Yield		11.00%
Level 3 [Member] | Derivative [Member] | Variable Funding Note Swaps [Member] | Discounted Cash Flows [Member] | Securities Sold, Not yet Purchased [Member] | Derivatives, Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Constant prepayment rate	20.00%
Constant default rate	2.00%
Loss severity	25.00%
Yield	13.00%
Level 3 [Member] | Derivative [Member] | Total Return Swap [Member] | Comparable Pricing [Member] | Financial Instruments Owned [Member] | Derivatives, Assets [Member] | Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Comparable loan price | $ / shares	$ 86	$ 91.7
Level 3 [Member] | Derivative [Member] | Total Return Swap [Member] | Comparable Pricing [Member] | Financial Instruments Owned [Member] | Derivatives, Assets [Member] | Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Comparable loan price | $ / shares	100	92.4
Level 3 [Member] | Derivative [Member] | Total Return Swap [Member] | Comparable Pricing [Member] | Financial Instruments Owned [Member] | Derivatives, Assets [Member] | Weighted Average [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Comparable loan price | $ / shares	95.0	92.1
Level 3 [Member] | Derivative [Member] | Total Return Swap [Member] | Comparable Pricing [Member] | Securities Sold, Not yet Purchased [Member] | Minimum [Member] | Derivatives, Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Comparable loan price | $ / shares	86	91.7
Level 3 [Member] | Derivative [Member] | Total Return Swap [Member] | Comparable Pricing [Member] | Securities Sold, Not yet Purchased [Member] | Maximum [Member] | Derivatives, Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Comparable loan price | $ / shares	100	92.4
Level 3 [Member] | Derivative [Member] | Total Return Swap [Member] | Comparable Pricing [Member] | Securities Sold, Not yet Purchased [Member] | Weighted Average [Member] | Derivatives, Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Comparable loan price | $ / shares	$ 95	92.1
Level 3 [Member] | Derivative [Member] | Interest Rate Swap [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Derivatives, Assets [Member] | Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Credit spread	6.70%
Level 3 [Member] | Derivative [Member] | Interest Rate Swap [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Derivatives, Assets [Member] | Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Credit spread	8.00%
Level 3 [Member] | Derivative [Member] | Interest Rate Swap [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Derivatives, Assets [Member] | Weighted Average [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Credit spread	7.10%
Level 3 [Member] | Derivative [Member] | Foreign Exchange Forward [Member] | Market Approach [Member] | Securities Sold, Not yet Purchased [Member] | Derivatives, Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Credit spread	5.00%
Level 3 [Member] | Non Exchange Traded Securities [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Corporate Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Transaction level | $ / shares	$ 2	$ 1
EBITDA (a) multiple		4.4
Level 3 [Member] | Non Exchange Traded Securities [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Corporate Equity Securities [Member] | Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Underlying stock price | $ / shares		$ 5
EBITDA (a) multiple	5.0
Level 3 [Member] | Non Exchange Traded Securities [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Corporate Equity Securities [Member] | Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Underlying stock price | $ / shares		102
EBITDA (a) multiple	16.0
Level 3 [Member] | Non Exchange Traded Securities [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Corporate Equity Securities [Member] | Weighted Average [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Underlying stock price | $ / shares	$ 21.0	19.0
EBITDA (a) multiple	12.3
Level 3 [Member] | Non Exchange Traded Securities [Member] | Comparable Pricing [Member] | Financial Instruments Owned [Member] | Corporate Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Underlying stock price | $ / shares	$ 4
Discount rate	65.00%
Level 3 [Member] | Private Equity Securities [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Investments at Fair Value [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Transaction level | $ / shares	$ 74	$ 64
Enterprise value	$ 5,200	$ 5,200
Level 3 [Member] | Private Equity Securities [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Investments at Fair Value [Member] | Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount rate		15.00%
Level 3 [Member] | Private Equity Securities [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Investments at Fair Value [Member] | Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount rate		30.00%
Level 3 [Member] | Private Equity Securities [Member] | Market Approach [Member] | Financial Instruments Owned [Member] | Investments at Fair Value [Member] | Weighted Average [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Discount rate	23.00%	23.00%
Level 3 [Member] | Loans [Member] | Scenario Analysis [Member] | Securities Sold, Not yet Purchased [Member] | Loans [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Estimated recovery percentage	14.00%
Level 3 [Member] | Loans [Member] | Comparable Pricing [Member] | Securities Sold, Not yet Purchased [Member] | Loans [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Comparable loan price | $ / shares		$ 100