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Inventories (Details) - USD ($)
$ in Millions
3 Months Ended
Nov. 30, 2020
Feb. 28, 2021
May 31, 2020
Inventories      
Aircraft and engine parts, components and finished goods   $ 494.0 $ 556.6
Raw materials and parts   49.7 45.9
Work-in-process   20.5 20.6
Total inventories   $ 564.2 $ 623.1
Inventory loss charged to reserves $ 1.2