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

6 Months Ended

Mar. 31, 2020

Disaggregation of Revenue [Line Items]

Disaggregation of Revenue [Table Text Block]

	Three Months Ended March 31,				Six Months Ended March 31,
	2020		2019		2020		2019
Revenues from contracts with clients:
Commission and clearing fees:
Sales-based:
Exchange-traded futures and options	$	40.1	$	31.2	$	72.5	$	70.3
OTC derivative brokerage	6.7		7.3		12.2		16.2
Equities and fixed income	7.1		3.6		11.4		6.8
Mutual funds	1.6		1.9		2.9		4.5
Insurance and annuity products	2.4		1.5		4.5		3.0
Other	0.5		0.5		0.8		0.7
Total sales-based commission	58.4		46.0		104.3		101.5
Trailing:
Mutual funds	3.5		3.0		6.6		6.2
Insurance and annuity products	4.0		3.4		7.7		7.1
Total trailing commission	7.5		6.4		14.3		13.3
Clearing fees	41.6		26.8		71.1		59.4
Trade conversion fees	4.2		3.3		5.7		4.9
Other	4.9		2.6		8.4		5.5
Total commission and clearing fees:	116.6		85.1		203.8		184.6
Consulting, management, and account fees:
Underwriting fees	0.2		0.2		0.4		0.5
Asset management fees	8.7		6.0		16.2		12.2
Advisory and consulting fees	5.7		4.7		11.3		9.7
Sweep program fees	3.6		4.1		7.6		7.9
Client account fees	3.1		2.5		6.1		5.2
Other	1.3		1.6		2.3		2.7
Total consulting, management, and account fees	22.6		19.1		43.9		38.2
Total revenues from contracts with clients	$	139.2	$	104.2	$	247.7	$	222.8
Method of revenue recognition:
Point-in-time	$	113.7	$	83.0	$	198.3	$	179.7
Time elapsed	25.5		21.2		49.4		43.1
Total revenues from contracts with clients	139.2		104.2		247.7		222.8
Other sources of revenues
Physical precious metals trading	19,694.7		6,660.9		30,352.7		12,616.4
Physical agricultural and energy product trading	322.2		268.6		642.2		608.9
Principal gains, net	168.5		110.3		281.0		203.1
Interest income	41.7		48.2		87.7		93.2
Total revenues	$	20,366.3	$	7,192.2	$	31,611.3	$	13,744.4
Primary geographic region:
United States	$	585.6	$	456.6	$	1,097.9	$	983.6
Europe	150.0		53.8		261.6		107.1
South America	16.3		12.4		31.5		23.9
Middle East and Asia	19,613.3		6,667.3		30,218.8		12,625.9
Other	1.1		2.1		1.5		3.9
Total revenues	$	20,366.3	$	7,192.2	$	31,611.3	$	13,744.4