Auto Loan Receivables (Past Due Receivables) (Details) - USD ($) $ in Millions	Feb. 29, 2020	Feb. 28, 2019
Financing Receivable, Past Due [Line Items]
Total ending managed receivables	$ 13,617.8	$ 12,510.2
Total past due	$ 468.9	$ 451.8
Past due receivables as a percentage of total ending managed receivables	3.44%	3.61%
Managed Receivables
Financing Receivable, Past Due [Line Items]
Item as percent of total ending managed receivables	100.00%	100.00%
Thirty One To Sixty Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total past due	$ 296.4	$ 276.5
Past due receivables as a percentage of total ending managed receivables	2.18%	2.21%
Sixty One To Ninety Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total past due	$ 138.3	$ 141.4
Past due receivables as a percentage of total ending managed receivables	1.01%	1.13%
Greater Than Ninety Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total past due	$ 34.2	$ 33.9
Past due receivables as a percentage of total ending managed receivables	0.25%	0.27%