Variable Interest Entities (Details) $ in Millions	3 Months Ended		15 Months Ended
	Dec. 31, 2015 USD ($) VIE	Dec. 31, 2014 USD ($)	Dec. 31, 2014 transfer VIE	Sep. 30, 2015
Variable Interest Entity [Line Items]
Number of entities formed | VIE			3
Grupo Finmart
Variable Interest Entity [Line Items]
Number of transfers of consumer loans to various securitization trusts | transfer			6
Variable Interest Entities B and C | Grupo Finmart
Variable Interest Entity [Line Items]
Percent of cash flows received	100.00%
Variable Interest Entity A | Grupo Finmart
Variable Interest Entity [Line Items]
Percent of cash flows received	50.00%
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entities income | $	$ 3.2	$ 10.6
Variable interest entities expense | $	$ 4.2	$ 11.0
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entity, number of entities | VIE	2
Non Recourse Debt | 5.8% Consumer loans facility due 2019
Variable Interest Entity [Line Items]
Stated interest rate	5.80%	5.80%	5.80%	5.80%