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Inventories (Details) - USD ($)
$ in Millions
3 Months Ended
Nov. 30, 2020
May 31, 2020
Inventories    
Aircraft and engine parts, components and finished goods $ 521.9 $ 556.6
Raw materials and parts 41.1 45.9
Work-in-process 22.0 20.6
Total inventories 585.0 $ 623.1
Inventory loss charged to reserves $ 1.2