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Inventories (Tables)

12 Months Ended

Dec. 31, 2024

Text Block 1 [Abstract]

Summary of Inventories


						12.31.2024																12.31.2023
						Gross book value				Write-down for obsolescence				Write-down for market value				Net book value				Gross book value				Write-down for obsolescence				Write-down for market value				Net book value
Raw materials							1,302.6				(84.6	)			—				1,218.0				1,118.9				(81.7	)			—				1,037.2
Work in process							840.9				—				—				840.9				774.9				—				—				774.9
Spare parts							476.5				(38.2	)			(0.9	)			437.4				477.6				(34.3	)			(1.4	)			441.9
Finished goods			(i	)			76.8				—				—				76.8				61.6				—				—				61.6
Held by third parties							112.2				(4.5	)			—				107.7				97.5				(1.3	)			—				96.2
Advances to suppliers							39.1				—				—				39.1				25.4				—				—				25.4
Inventory in transit							163.2				—				—				163.2				155.7				—				—				155.7
Consumption materials							58.4				(5.4	)			—				53.0				51.7				(8.6	)			—				43.1

							3,069.7				(132.7	)			(0.9	)			2,936.1				2,763.3				(125.9	)			(1.4	)			2,636.0

Summary of Loss Due to Reduction in Market Value

The movement of write-down for reduction in market value was as follows:


		12.31.2024				12.31.2023				12.31.2022
Beginning balance			(1.4	)			(5.7	)			(1.0	)
Additions			—				(0.6	)			(5.9	)
Disposals			0.1				—				1.2
Reversals			0.4				4.9				—

Ending balance			(0.9	)			(1.4	)			(5.7	)

Summary of Loss Due to Obsolescence

The movement of write-down for obsolescence was as follows:


		12.31.2024				12.31.2023				12.31.2022
Beginning balance			(125.9	)			(126.1	)			(150.9	)
Additions			(52.9	)			(50.5	)			(38.4	)
Disposals			11.5				13.5				54.0
Reversals			33.9				37.5				8.6
Foreign exchange gain (loss)			0.7				(0.3	)			0.6

Ending balance			(132.7	)			(125.9	)			(126.1	)