Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Allowance for credit losses	$ 76.4	$ 71.5
Stock-based compensation	14.8	12.6
Deferred state net operating loss	3.9	3.0
Other, net	9.2us-gaap_DeferredTaxAssetsOther	7.9us-gaap_DeferredTaxAssetsOther
Total deferred tax assets	104.3us-gaap_DeferredTaxAssetsGross	95.0us-gaap_DeferredTaxAssetsGross
Valuation of Loans receivable	306.5	242.3
Deferred Loan origination costs	2.7	3.3
Other, net	8.5us-gaap_DeferredTaxLiabilitiesOther	6.6us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities	317.7us-gaap_DeferredTaxLiabilities	252.2us-gaap_DeferredTaxLiabilities
Net deferred tax liabilities	$ 213.4us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 157.2us-gaap_DeferredTaxAssetsLiabilitiesNet

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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