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Inventories (Details) - USD ($)
$ in Millions
3 Months Ended
Nov. 30, 2020
Feb. 28, 2022
May 31, 2021
Inventories      
Aircraft and engine parts, components and finished goods   $ 451.0 $ 468.4
Raw materials and parts   61.4 53.0
Work-in-process   22.8 19.2
Total inventories   $ 535.2 $ 540.6
Inventory loss charged to reserves $ 1.2