Floating stools usually mean there is gas. It's often a result of a change in diet, poor nutrition, but most of the time, they are harmless.
They can indicate an infection in your gastrointestinal system, especially if they have a foul smell.
Most of the time, it's not an indication that anything serious is wrong.
https://medlineplus.gov/ency/article/003128.htm
https://medlineplus.gov/ency/article/003128.htm