I would use Roy Jones Jr style, that he used against James Tony and box in and out constantly turning Floyd and making him keep his guard high keeping him blind, with quick flurry of power punches, then bumping Floyd so he couldn't get set to attack, then i would switch styles using a southpaw Zab Judah style ,he gave Floyd trouble, mixing certain styles, so Floyd couldn't get confident and comfortable and get my timing down, maybe even pressure Floyd like Chavez sr, believe it or not, i can box using different techniques or styles anyway, so that's not a problem, i can even box and kickbox backing up.
First 4 rounds, i would fight Floyd just like Zab did, winning rounds and then when he starts walking me down, using a high guard, i would start boxing like Roy ,counter punching him using super quick flurry's, jumping in and out, totally confusing Floyd and then, when he's behind trying to counter me, i pressure him staying in his face,like Maidana and wouldn't let him breath, keeping him on the ropes, banging on everything, arms, shoulders, basically hitting him everywhere.
Like this.
First 4 rounds Southpaw style Zab Judah, this confused Floyd and Zab won some rounds.
Rounds 5-8 Roy Jones style , confuse Floyd some more ,so he's not getting my timing down and can't win rounds, he's to busy trying to figure me out.
Rounds 9-12 Mexican style Chavez or Maidana pressure and make Floyd fight defensive and on the ropes, just like Cotto did against Floyd and he won some rounds
Floyd is so busy trying to figure me out, he's losing the fight and can't get off in the late rounds because of my pressure.
Boom! i win the fight.