Cancellation Reserves (Schedule Of Cancellation Reserves Accrual) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of beginning of period	$ 122.6	$ 111.6	$ 117.9	$ 102.8
Cancellations	(17.4)	(18.4)	(48.3)	(55.1)
Provision for future cancellations	17.9	19.6	53.5	65.1
Balance as of end of period	$ 123.1	$ 112.8	$ 123.1	$ 112.8