Auto Loan Receivables (Allowance For Loan Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 29, 2020	Feb. 28, 2019	Feb. 28, 2018
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning of year	$ 138.2	$ 128.6
Charge-offs	(309.0)	(274.2)
Recoveries	142.9	130.0
Provision for loan losses	185.7	153.8	$ 137.6
Balance as of end of year	$ 157.8	$ 138.2	$ 128.6
Allowance For Loan Losses
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Item as percent of total ending managed receivables	1.16%	1.10%	1.11%