Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Allowance for credit losses	$ 110.1	$ 100.4
Stock-based compensation	16.5	14.3
Deferred state net operating loss	4.3	8.1
Other, net	7.0	4.0
Total deferred tax assets	137.9	126.8
Deferred Tax Assets, Valuation Allowance	0.0	(5.5)
Deferred Tax Assets, Net of Valuation Allowance	137.9	121.3
Valuation of Loans receivable	363.9	300.4
Deferred Loan origination costs	1.5	1.5
Other, net	9.2	6.8
Total deferred tax liabilities	374.6	308.7
Deferred income taxes, net	$ 236.7	$ 187.4