Floatplanes were assigned as Dets. from their administrative squadrons.  US Navy float plane squadrons were designated, it seems like, VMO or VO, for Navy  or Marine fixed-wing observation since their primary duty was to direct fire for the ship's big guns.  
The German equivalent were Kustenfleigergeschwaderen.  All German aircraft, land-based, float-planes or carrier borne, by law,  belonged to the Luftwaffe, which caused no end of trouble for the Kreigsmarine.  Whenever they wanted anything, they had to go begging, hat in hand, to the Luftwaffe weapons procurement department, and practically never got what they actually needed or wanted.
RN floatplanes were operated by regular RN squadrons which sent Dets. out to Battleships and Cruisers, as well as by RAF Coastal Command 
 
  