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

3 Months Ended

Dec. 31, 2019

Disaggregation of Revenue [Line Items]

Disaggregation of Revenue [Table Text Block]

	Three Months Ended December 31,
	2019		2018
Revenues from contracts with clients:
Commission and clearing fees:
Sales-based:
Exchange-traded futures and options	$	32.4	$	39.1
OTC derivative brokerage	5.5		8.9
Equities and fixed income	4.3		1.1
Mutual funds	1.3		2.6
Insurance and annuity products	2.1		1.5
Other	0.3		0.2
Total sales-based commission	45.9		53.4
Trailing:
Mutual funds	3.1		3.2
Insurance and annuity products	3.7		3.7
Total trailing commission	6.8		6.9
Clearing fees	29.5		32.6
Trade conversion fees	1.5		1.6
Other	3.5		2.9
Total commission and clearing fees:	87.2		97.4
Consulting, management, and account fees:
Underwriting fees	0.2		0.3
Asset management fees	7.5		6.2
Advisory and consulting fees	5.6		5.0
Sweep program fees	4.0		3.8
Client account fees	3.0		2.7
Other	1.0		1.1
Total consulting, management, and account fees	21.3		19.1
Total revenues from contracts with clients	$	108.5	$	116.5
Method of revenue recognition:
Point-in-time	$	84.6	$	94.6
Time elapsed	23.9		21.9
Total revenues from contracts with clients	108.5		116.5
Other sources of revenues
Physical precious metals trading	10,658.0		5,955.6
Physical agricultural and energy product trading	320.0		340.2
Principal gains, net	112.5		94.9
Interest income	46.0		45.0
Total revenues	$	11,245.0	$	6,552.2
Primary geographic region:
United States	$	512.3	$	527.0
Europe	111.6		53.3
South America	15.2		11.4
Middle East and Asia	10,605.5		5,958.7
Other	0.4		1.8
Total revenues	$	11,245.0	$	6,552.2