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Inventories - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 30, 2013
Dec. 31, 2012
Components Of Inventory [Line Items]    
Raw materials and supplies in inventory, percentage 36.00% 37.00%
Finished and semi-finished products in inventory, percentage 64.00% 63.00%
Inventories valued using the last-in, first-out 43.00% 45.00%
Increased value of inventory if FIFO method had been used $ 625.2 $ 607.2
Lower of cost or market adjustments $ 4.4 $ 3.5