Cancellation Reserves (Schedule Of Cancellation Reserves Accrual) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of beginning of period	$ 116.7	$ 109.5	$ 117.9	$ 102.8
Cancellations	(16.1)	(17.9)	(30.9)	(36.7)
Provision for future cancellations	22.0	20.0	35.6	45.5
Balance as of end of period	$ 122.6	$ 111.6	$ 122.6	$ 111.6