Assets and Liabilities, at Fair Value (Tables)

3 Months Ended

Dec. 31, 2017

Assets and Liabilities, at Fair Value [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following tables set forth the Company’s financial and nonfinancial assets and liabilities accounted for at fair value, on a recurring basis, as of December 31, 2017 by level in the fair value hierarchy.



	December 31, 2017
(in millions)	Level 1		Level 2		Level 3		Netting and Collateral (1)			Total
Assets:
Unrestricted cash equivalents - certificate of deposits	$	4.7	$	—	$	—	$	—		$	4.7
Commodities warehouse receipts	14.9		—		—		—			14.9
U.S. Treasury obligations	1.6		—		—		—			1.6
Securities and other assets segregated under federal and other regulations	16.5		—		—		—			16.5
U.S. Treasury obligations	219.1		—		—		—			219.1
"To be announced" (TBA) and forward settling securities	—		1.7		—		(0.6		)	1.1
Foreign government obligations	—		6.2		—		—			6.2
Derivatives	3,068.1		188.7		—		(3,429.5		)	(172.7		)
Deposits with and receivables from broker-dealers, clearing organization and counterparties	3,287.2		196.6		—		(3,430.1		)	53.7
Common and preferred stock, ADRs, and GDRs	30.5		3.4		0.1		—			34.0
Exchangeable foreign ordinary equities, ADRs, and GDRs	9.0		1.1		—		—			10.1
Corporate and municipal bonds	45.1		0.6		—		—			45.7
U.S. Treasury obligations	76.8		—		—		—			76.8
U.S. government agency obligations	—		587.7		—		—			587.7
Foreign government obligations	—		11.3		—		—			11.3
Agency mortgage-backed obligations	—		1,053.4		—		—			1,053.4
Asset-backed obligations	—		21.6		—		—			21.6
Derivatives	1.4		1,577.8		—		(1,444.3		)	134.9
Commodities leases	—		178.9		—		(168.5		)	10.4
Commodities warehouse receipts	56.1		—		—		—			56.1
Exchange firm common stock	8.9		—		—		—			8.9
Mutual funds and other	5.0		—		—		—			5.0
Financial instruments owned	232.8		3,435.8		0.1		(1,612.8		)	2,055.9
Physical commodities inventory, net	142.7		—		—		—			142.7
Total assets at fair value	$	3,683.9	$	3,632.4	$	0.1	$	(5,042.9	)	$	2,273.5
Liabilities:
TBA and forward settling securities	—		1.7		—		(0.6		)	1.1
Derivatives	3,169.6		212.5		—		(3,382.1		)	—
Payable to broker-dealers, clearing organizations and counterparties	3,169.6		214.2		—		(3,382.7		)	1.1
Common and preferred stock, ADRs, and GDRs	48.6		1.2		—		—			49.8
Exchangeable foreign ordinary equities, ADRs, and GDRs	10.2		—		—		—			10.2
Corporate and municipal bonds	0.3		—		—		—			0.3
U.S. Treasury obligations	404.6		—		—		—			404.6
U.S. government agency obligations	—		35.5		—		—			35.5
Agency mortgage-backed obligations	—		3.9		—		—			3.9
Derivatives	—		1,634.6		—		(1,385.3		)	249.3
Commodities leases	—		186.4		—		(136.7		)	49.7
Financial instruments sold, not yet purchased	463.7		1,861.6		—		(1,522.0		)	803.3
Total liabilities at fair value	$	3,633.3	$	2,075.8	$	—	$	(4,904.7	)	$	804.4


(1)	Represents cash collateral and the impact of netting across the levels of the fair value hierarchy. Netting among positions classified within the same level is included in that level.

The following table sets forth the Company’s financial and nonfinancial assets and liabilities accounted for at fair value, on a recurring basis, as of September 30, 2017 by level in the fair value hierarchy.



	September 30, 2017
(in millions)	Level 1		Level 2		Level 3		Netting and Collateral (1)			Total
Assets:
Unrestricted cash equivalents - certificates of deposits	$	3.8	$	—	$	—	$	—		$	3.8
Commodities warehouse receipts	21.0		—		—		—			21.0
U.S. Treasury obligations	33.5		—		—		—			33.5
Securities and other assets segregated under federal and other regulations	54.5		—		—		—			54.5
U.S. Treasury obligations	244.7		—		—		—			244.7
"To be announced" (TBA) and forward settling securities	—		8.8		—		—			8.8
Foreign government obligations	—		6.4		—		—			6.4
Derivatives	2,608.6		289.1		—		(2,952.9		)	(55.2		)
Deposits with and receivables from broker-dealers, clearing organizations, and counterparties	2,853.3		304.3		—		(2,952.9		)	204.7
Common and preferred stock, ADRs, and GDRs	31.2		3.4		0.1		—			34.7
Exchangeable foreign ordinary equities, ADRs, and GDRs	9.2		1.2		—		—			10.4
Corporate and municipal bonds	28.2		0.9		—		—			29.1
U.S. Treasury obligations	60.0		—		—		—			60.0
U.S. government agency obligations	—		368.9		—		—			368.9
Foreign government obligations	—		10.2		—		—			10.2
Agency mortgage-backed obligations	—		920.9		—		—			920.9
Asset-backed obligations	—		47.3		—		—			47.3
Derivatives	1.3		1,413.4		—		(1,252.6		)	162.1
Commodities leases	—		174.1		—		(138.7		)	35.4
Commodities warehouse receipts	38.5		—		—		—			38.5
Exchange firm common stock	8.3		—		—		—			8.3
Mutual funds and other	6.0		—		—		—			6.0
Financial instruments owned	182.7		2,940.3		0.1		(1,391.3		)	1,731.8
Physical commodities inventory, net	73.2		—		—		—			73.2
Total assets at fair value	$	3,167.5	$	3,244.6	$	0.1	$	(4,344.2	)	$	2,068.0
Liabilities:
Accounts payable and other accrued liabilities - contingent liabilities	$	—	$	—	$	1.0	$	—		$	1.0
TBA and forward settling securities	—		4.9		—		(0.1		)	4.8
Derivatives	2,476.2		292.8		—		(2,769.0		)	—
Payable to broker-dealers, clearing organizations and counterparties	2,476.2		297.7		—		(2,769.1		)	4.8
Common and preferred stock, ADRs, and GDRs	33.7		0.7		—		—			34.4
Exchangeable foreign ordinary equities, ADRs, and GDRs	10.3		0.2		—		—			10.5
Corporate and municipal bonds	0.3		—		—		—			0.3
U.S. Treasury obligations	285.9		—		—		—			285.9
U.S. government agency obligations	—		27.9		—		—			27.9
Agency mortgage-backed obligations	—		0.1		—		—			0.1
Derivatives	—		1,427.2		—		(1,110.2		)	317.0
Commodities leases	—		191.1		—		(149.6		)	41.5
Financial instruments sold, not yet purchased	330.2		1,647.2		—		(1,259.8		)	717.6
Total liabilities at fair value	$	2,806.4	$	1,944.9	$	1.0	$	(4,028.9	)	$	723.4


(1)	Represents cash collateral and the impact of netting across the levels of the fair value hierarchy. Netting among positions classified within the same level is included in that level.

Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Information on Level 3 Financial Assets and Liabilities

The Company’s financial assets at fair value classified in Level 3 of the fair value hierarchy as of December 31, 2017 and September 30, 2017 are summarized below:



(in millions)	December 31, 2017			September 30, 2017
Total Level 3 assets	$	0.1		$	0.1
Level 3 assets for which the Company bears economic exposure	$	0.1		$	0.1
Total assets	$	6,808.9		$	6,243.4
Total assets at fair value	$	2,273.5		$	2,068.0
Total Level 3 assets as a percentage of total assets	—		%	—		%
Level 3 assets for which the Company bears economic exposure as a percentage of total assets	—		%	—		%
Total Level 3 assets as a percentage of total financial assets at fair value	—		%	—		%

The following tables set forth a summary of changes in the fair value of the Company’s Level 3 financial assets and liabilities during the three months ended December 31, 2017 and 2016, including a summary of unrealized gains (losses) during the respective periods on the Company’s Level 3 financial assets and liabilities still held as of December 31, 2017.



	Level 3 Financial Assets and Financial Liabilities For the Three Months Ended December 31, 2017
(in millions)	Balances at beginning of period		Realized gains (losses) during period		Unrealized gains (losses) during period		Purchases/issuances		Settlements		Transfers in or (out) of Level 3		Balances at end of period
Assets:
Common stock and ADRs	$	0.1	$	—	$	—	$	—	$	—	$	—	$	0.1
	$	0.1	$	—	$	—	$	—	$	—	$	—	$	0.1



	Level 3 Financial Assets and Financial Liabilities For the Three Months Ended December 31, 2016
(in millions)	Balances at beginning of period		Realized gains (losses) during period		Unrealized gains (losses) during period		Purchases/issuances		Settlements			Transfers in or (out) of Level 3		Balances at end of period
Assets:
Common stock and ADRs	$	0.2	$	—	$	—	$	—	$	—		$	—	$	0.2
Corporate and municipal bonds	3.0		—		—		—		(3.0		)	—		—
	$	3.2	$	—	$	—	$	—	$	(3.0	)	$	—	$	0.2

(in millions)	Balances at beginning of period		Realized (gains) losses during period		Unrealized (gains) losses during period		Purchases/issuances		Settlements			Transfers in or (out) of Level 3		Balances at end of period
Liabilities:
Contingent liabilities	$	0.8	$	—	$	—	$	—	$	—		$	—	$	0.8