I'll answer very quickly.
It's simply a mathematical formula. We know the size of the public service. We know the number of agreements reached to this point. Therefore we're simply extrapolating and doing a forecast of what the amounts would be to cover the public service if the pattern holds.
Second, in terms of how this is funded, there was an operating budget freeze introduced in 2013 that covered a two-year period. Departments are responsible for the portion of the increase that covers that period. They have put money aside, and we're bringing it into these supplementary estimates (a). It's their money and they're going to be paying their bills. Moving forward, there is a central vote administered by the Treasury Board Secretariat that makes the departments whole for the costs going forward, for this agreement.