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Inventory by Category (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Mar. 31, 2013
Inventory, Net [Abstract]    
Finished goods $ 227.4 $ 203.0
Work in progress 72.4 73.5
Raw materials 58.0 43.0
Inventories at First-in, First-Out (FIFO) cost 357.8 319.5
Adjustment to state inventories at Last-in, First-Out (LIFO) cost 1.9 6.7
Inventories, net $ 359.7 $ 326.2