Leases (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Option to extend operating lease	true
Option to terminate operating lease	true
Weighted average remaining lease term	9 years	10 years
Weighted average discount rate	4.31%	3.86%
Operating lease expenses	$ 27.9	$ 23.7	$ 22.5
Short term lease expenses	40.4	35.8	28.0
Cash paid related to operating lease obligations	22.8	20.1	19.0
Right-of-use assets obtained in exchange for operating lease liabilities	$ 38.8	30.9	$ 28.6
ROCA ACERO, S.A. de C.V.
Right-of-use assets obtained in exchange for operating lease liabilities		$ 16.8