I'm shaking my head because the European-based system is fundamentally different from the North American one. It's an Aegis class system with Standard Missile-3s. The United States purposely changed to that system because Russia had regarded the idea of larger interceptors as threatening to it. It's thus a different system from the system based in Alaska. The system based in Alaska is for intercepts in space. It also has a potential aggressive function, in that it is the ideal anti-satellite weapon system also.
That should be part of the discussion, if Canada wants to move forward on this.