Cancellation Reserves (Schedule Of Cancellation Reserves Accrual) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2022	Aug. 31, 2021
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of beginning of period	$ 148.7	$ 138.4	$ 144.7	$ 124.5
Cancellations	(27.4)	(22.9)	(55.1)	(43.1)
Provision for future cancellations	27.5	28.8	59.2	62.9
Balance as of end of period	$ 148.8	$ 144.3	$ 148.8	$ 144.3