Revenue from Contracts with Clients Disaggregation of Revenues Table (Tables)

6 Months Ended

Mar. 31, 2019

Disaggregation of Revenue [Line Items]

Disaggregation of Revenue [Table Text Block]

	Three Months Ended March 31,				Six Months Ended March 31,
	2019		2018		2019		2018
Revenues from contracts with clients:
Commission and clearing fees:
Sales-based:
Exchange-traded futures and options	$	31.2	$	44.0	$	70.3	$	78.6
OTC derivative brokerage	7.3		8.3		16.2		15.8
Equities and fixed income	3.6		2.8		6.8		5.6
Mutual funds	1.9		2.1		4.5		4.1
Insurance and annuity products	1.5		1.5		3.0		3.0
Other	0.5		—		0.7		0.6
Total sales-based commission	46.0		58.7		101.5		107.7
Trailing:
Mutual funds	3.0		3.3		6.2		6.6
Insurance and annuity products	3.4		3.7		7.1		7.3
Total trailing commission	6.4		7.0		13.3		13.9
Clearing fees	26.8		34.5		59.4		59.5
Trade conversion fees	3.3		2.0		4.9		3.8
Other	2.6		4.2		5.5		8.0
Total commission and clearing fees:	85.1		106.4		184.6		192.9
Consulting, management, and account fees:
Underwriting fees	0.2		0.7		0.5		1.3
Asset management fees	6.0		6.4		12.2		12.5
Advisory and consulting fees	4.7		4.8		9.7		9.4
Sweep program fees	4.1		2.7		7.9		4.9
Customer account fees	2.5		2.9		5.2		5.7
Other	1.6		0.9		2.7		1.2
Total consulting, management, and account fees	19.1		18.4		38.2		35.0
Total revenues from contracts with clients	$	104.2	$	124.8	$	222.8	$	227.9
Method of revenue recognition:
Point-in-time	$	83.0	$	103.9	$	179.7	$	187.2
Time elapsed	21.2		20.9		43.1		40.7
Total revenues from contracts with clients	104.2		124.8		222.8		227.9
Other sources of revenues
Precious metals trading	6,660.9		6,031.6		12,616.4		13,563.5
Agricultural and energy merchandising and origination	268.6		224.2		608.9		406.7
Principal gains, net	110.3		98.5		203.1		175.6
Interest income	48.2		27.9		93.2		51.9
Total revenues	$	7,192.2	$	6,507.0	$	13,744.4	$	14,425.6
Primary geographic region:
United States	$	456.6	$	404.1	$	983.6	$	728.0
Europe	53.8		47.8		107.1		93.0
South America	12.4		16.7		23.9		31.7
Middle East and Asia	6,667.3		6,037.4		12,625.9		13,571.0
Other	2.1		1.0		3.9		1.9
Total revenues	$	7,192.2	$	6,507.0	$	13,744.4	$	14,425.6