Revenue and Segment Disclosures Revenue classified by timing of recognition (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2021	Aug. 31, 2020
Revenue classified by timing of recognition [Line Items]
Revenues	$ 175.0	$ 259.0	$ 349.0	$ 465.0
Products and services transferred over time
Revenue classified by timing of recognition [Line Items]
Revenues	107.0	125.0	213.0	241.0
Products and services transferred at a point in time
Revenue classified by timing of recognition [Line Items]
Revenues	$ 68.0	$ 134.0	$ 136.0	$ 224.0