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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Class Of Inventories [Line Items]    
Raw materials $ 1,218.0 $ 1,037.2
Work in process 840.9 774.9
Spare parts 437.4 441.9
Finished goods 76.8 61.6
Held by third parties 107.7 96.2
Advances to suppliers 39.1 25.4
Inventory in transit 163.2 155.7
Consumption materials 53.0 43.1
Total 2,936.1 2,636.0
Gross amount [Member]    
Class Of Inventories [Line Items]    
Raw materials 1,302.6 1,118.9
Work in process 840.9 774.9
Spare parts 476.5 477.6
Finished goods 76.8 61.6
Held by third parties 112.2 97.5
Advances to suppliers 39.1 25.4
Inventory in transit 163.2 155.7
Consumption materials 58.4 51.7
Total 3,069.7 2,763.3
Loss due to obsolescence [Member]    
Class Of Inventories [Line Items]    
Raw materials (84.6) (81.7)
Work in process 0.0 0.0
Spare parts (38.2) (34.3)
Finished goods 0.0 0.0
Held by third parties (4.5) (1.3)
Advances to suppliers 0.0 0.0
Inventory in transit 0.0 0.0
Consumption materials (5.4) (8.6)
Total (132.7) (125.9)
Loss of market value [Member]    
Class Of Inventories [Line Items]    
Raw materials 0.0 0.0
Work in process 0.0 0.0
Spare parts (0.9) (1.4)
Finished goods 0.0 0.0
Held by third parties 0.0 0.0
Advances to suppliers 0.0 0.0
Inventory in transit 0.0 0.0
Consumption materials 0.0 0.0
Total $ (0.9) $ (1.4)