Quarterly report pursuant to Section 13 or 15(d)

Leases (Components of Lease Expense) (Details)

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Leases (Components of Lease Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Feb. 29, 2020
Feb. 29, 2020
May 31, 2019
Leases [Abstract]      
Fixed payment operating lease expense $ 9.7 $ 29.4 $ 42.9
Variable payment operating lease expense  
Short-term lease expense   $ 0.2