It won't be any type of split deal. Floyd would have just offered him X amount to take the fight, like he does with all opponents recently.
Considering that more than likely Floyd pulled 800k (being generous here) in his las ppv, that split is not bad. I'm not sure how much of the pie Canelo gets for having the fight broadcasted in Mexico.
800k is an enormous number. That's top 15 non HW PPV lol. Canelo can't get 800k against anyone other than Mayweather or Chavez Jr.