In an attempt to increase transparency, Prime Minister Justin Trudeau has made “mandate letters” to his ministers publicly available. These letters are intended to clarify the focus of each minister’s portfolio.
No normal person pays close attention to who is "in" or "out" as finance minister, and that's a good thing. It means the politician in question has avoided messing up the lives of ordinary Canadians. Still, their actions can and do matter, for better or worse.