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Inventories (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Inventories      
LIFO inventories - cost on FIFO method $ 2,087.3 $ 2,257.9  
Cost on FIFO method higher than LIFO value (579.3) (743.8)  
Inventories - stated on LIFO method 1,508.0 1,514.1  
Inventories - stated on FIFO method 535.2 481.2  
Inventories 2,043.2 1,995.3  
LIFO inventory valuation reserve (income) expense $ (164.5) $ (76.6) $ 704.8