Variable Interest Entities (Details) $ in Millions	3 Months Ended		6 Months Ended		15 Months Ended
	Mar. 31, 2016 USD ($) VIE	Mar. 31, 2015 USD ($)	Mar. 31, 2016 USD ($) VIE	Mar. 31, 2015 USD ($)	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 | $	$ 4.1	$ 9.3	$ 7.3	$ 19.9
Variable interest entities expense | $	$ 1.6	$ 6.0	$ 5.8	$ 17.0
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entity, number of entities | VIE	2		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%		5.80%