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Subsequent events	3 Months Ended
Subsequent events	Mar. 31, 2025
Subsequent Events [Abstract]
Subsequent events	Subsequent events On April 1, 2025, CPKC sold its 50% equity method investment in the Panama Canal Railway Company to APM Terminals Panama Rail LP (“APM Terminals”), a subsidiary of A.P. Moller-Maersk A/S, for gross proceeds of U.S. $350 million before purchase price adjustments for cash acquired and debt and net working capital assumed by APM Terminals, and transaction costs. CPKC anticipates a pre-tax gain of approximately U.S. $230 million in the second quarter of 2025, subject to finalization of the purchase price adjustments.