Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Allowance for credit losses	$ 118.2	$ 89.8
Stock-based compensation	18.3	18.8
Deferred state net operating loss	6.5	5.1
Other, net	11.6	11.3
Total deferred tax assets	154.6	125.0
Valuation of Loans receivable	417.8	364.2
Deferred Loan origination costs	2.5	2.5
Other, net	7.4	7.2
Total deferred tax liabilities	427.7	373.9
Deferred income taxes, net	$ 273.1	$ 248.9