Credit Facilities - Credit Facilities (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Jul. 29, 2013	Jun. 30, 2013	Sep. 30, 2012
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding		$ 145.6	$ 218.2
Main line of credit facilities [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		355.0
HCO Syndicated line of credit facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	135.0	105.0
Line of Credit Facility, Increase, Additional Borrowings	30
Line of Credit Facility, Amount Outstanding		79.0	48.0
INTL COM line of credit facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		100.0
Line of Credit Facility, Amount Outstanding		60.0	107.0
FCS Margin line of credit facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		75.0
Line of Credit Facility, Amount Outstanding		0	20.0
FMS Sub-note commodity line of credit facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		75.0
Line of Credit Facility, Amount Outstanding		$ 6.6	$ 43.2