The information on the bill is presented by the minister tabling the bill. It's up to that minister to determine what information he provides on cost at that time.
As bills progress and change and as we move toward implementation of the actual initiatives, the costs themselves change. As the ministers were explaining earlier today, there is high-level cost information provided when bills are tabled, and as the initiatives evolve over time and come closer to implementation, sometimes those costs evolve and become more precise.