How much should a former spouse have to share in the post increase of a payor’s income?

A case both counsel referred me to as being particularly helpful to deciding the issue of to what extent should a former spouse share in the post separation increase of a payor’s income, was the decision of Chappel J. in Thompson v. Thompson, 2013 ONCA 5500. It is clear from that case and others that the question is one that is “ultimately in the discretion of the court, to be undertaken having regard for the unique circumstances of each case and the general factors and objectives underlying spousal support.”