The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Intangible Assets and Goodwill - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Goodwill [Line Items]
Goodwill	$ 38,500,000		$ 38,500,000		$ 38,300,000
Pretax impairment charge recorded during the period for intangible assets related to our credit hedge funds			0	$ 198,400,000
Intangible asset amortization expense, excluding impairment losses	11,100,000	$ 20,400,000	30,400,000	$ 64,100,000
Corporate Private Equity
Goodwill [Line Items]
Goodwill	0		0
Real Assets
Goodwill [Line Items]
Goodwill					0
Operating Segments \| Global Market Strategies
Goodwill [Line Items]
Goodwill	$ 28,000,000		$ 28,000,000		$ 28,000,000
Level III \| Minimum \| Discounted Cash Flow \| Global Market Strategies
Goodwill [Line Items]
Discount rate (as a percent)			10.00%
Level III \| Maximum \| Discounted Cash Flow \| Global Market Strategies
Goodwill [Line Items]
Discount rate (as a percent)			20.00%