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Inventories (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Inventories      
LIFO inventories - cost on FIFO method $ 2,257.9 $ 2,498.2  
Cost on FIFO method higher than LIFO value (743.8) (820.4)  
Inventories - stated on LIFO method 1,514.1 1,677.8  
Inventories - stated on FIFO method 481.2 387.2  
Inventories 1,995.3 2,065.0  
LIFO inventory valuation reserve expense (income) $ (76.6) $ 704.8 $ (22.0)