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Special Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Special Charges (Details) - USD ($) $ in Millions	Nov. 30, 2020	Nov. 30, 2019	Feb. 29, 2020
Restructuring Cost and Reserve [Line Items]
Special charges	$ 0.7	$ 6.9	$ 0.7
Restructuring Reserve [Roll Forward]
Balance, end of period	2.0
Fiscal 2020 Actions
Restructuring Reserve [Roll Forward]
Balance, beginning of period	3.0
Severance and employee-related costs	0.3
Payments made during the period	(1.3)
Balance, end of period	2.0
Severance and employee-related costs
Restructuring Cost and Reserve [Line Items]
Special charges	0.3	5.1
Relocation and other restructuring costs
Restructuring Cost and Reserve [Line Items]
Special charges	$ 0.4	$ 1.8