Did CN or CP buy KCS?

Could you clarify for me: Did either CN or CP purchase KCS? If so, which one of them made the purchase? And could you possibly elaborate on the reasons behind the decision to acquire KCS? Additionally, I'm interested to know if there were any specific terms or conditions attached to this purchase. Finally, how does this acquisition align with the overall strategy of the company involved? Thank you for your assistance in clarifying these points.