The estimate included in the budget measures—the $13 billion over five years—is based on our current best estimates of Canadians who are within the income threshold, which is a family income below $90,000 a year, and who are currently uninsured.
The estimate is for what we would call “displacement”, which is additional money that would come to the government if somebody didn't maintain their current plan. However, I would say the measure included here that would compel employers to report whether they offer coverage or not is in part intended to make sure that we can track who currently has insurance and who doesn't.