How do I keep a floating window on top of a tabbed document so that it can be used as a reference while drawing/painting?

Just started using Photoshop CC on my iMac and I have noticed this issue which I did not have using windows based computers. Any floating window just seems to hide in the background as soon as I click on the tabbed document I want to work on. This is an issue for me since I like to have a couple of references open while painting plus I always have another with nothing but my color palette in it. I've already gone over the preferences but can't seem to find the way to avoid this and the options from Widow>Arrange weren't any help also resizing all windows so that they don't overlap each other ends up wasting a lot of screen real estate.