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Inventories - Schedule of Inventory, Current (Details) (USD $)
In Millions, unless otherwise specified
Feb. 28, 2015
May 31, 2014
Inventories [Abstract]    
Finished goods $ 104.8us-gaap_InventoryFinishedGoodsAndWorkInProcessNetOfReserves $ 58.2us-gaap_InventoryFinishedGoodsAndWorkInProcessNetOfReserves
Raw materials 23.7us-gaap_InventoryRawMaterialsNetOfReserves 20.2us-gaap_InventoryRawMaterialsNetOfReserves
Total $ 128.5us-gaap_InventoryNet $ 78.4us-gaap_InventoryNet