Segment Reporting (Tables)

12 Months Ended

Nov. 30, 2011

Segment Reporting [Abstract]

Net revenues, expenses, and total assets by segment

	Twelve Months Ended November 30, 2011		Eleven Months Ended November 30, 2010		Twelve Months Ended December 31, 2009
Capital Markets:
Net revenues	$	2,502.6	$	2,175.5	$	2,127.4
Expenses	$	2,095.0	$	1,751.4	$	1,587.5
Asset Management:
Net revenues	$	46.2	$	16.8	$	35.9
Expenses	$	30.9	$	29.3	$	30.8
Total:
Net revenues	$	2,548.8	$	2,192.3	$	2,163.3
Expenses	$	2,125.9	$	1,780.7	$	1,618.3

Total assets by segment

	November 30, 2011		November 30, 2010		December 31, 2009
Segment Assets:
Capital Markets	$	34,946.1	$	36,510.5	$	27,947.3
Asset Management		25.4		216.0		173.7
Total assets	$	34,971.4	$	36,726.5	$	28,121.0

Net revenues by geographic region

	Twelve Months Ended November 30, 2011		Eleven Months Ended November 30, 2010		Twelve Months Ended December 31, 2009
Americas(1)	$	2,027,887	$	1,882,764	$	1,895,479
Europe(2)		494,917		300,405		266,440
Asia (including Middle East)		26,009		9,081		1,342
Net revenues	$	2,548,813	$	2,192,250	$	2,163,261

(1) Substantially all relates to U.S. results.

(2) Substantially all relates to U.K. results.