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Inventory (Details) (USD $)
In Millions, unless otherwise specified
Feb. 28, 2014
May 31, 2013
Inventory    
Raw materials and parts $ 113.9 $ 83.9
Work-in-process 84.8 84.0
Purchased aircraft, parts, engines and components held for sale 308.1 285.8
Total inventories $ 506.8 $ 453.7