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Inventories (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Inventories      
Excess of inventories value by FIFO method over LIFO method $ 138.8 $ 202.9  
Inventories stated on the FIFO method 243.7 237.0  
Change in LIFO valuation reserve $ (64.1) $ 85.3 $ 34.8