Yes, a lot of the big industrial gear does that. They use a ground fault detection circuit to look for a fault to ground and flag up a warning if one is seen, rather than bombing out immediately. That allows the system to continue running until it can be brought safely to a halt. This can be handy if you happen to be operating eg an elevator lift or a paper / steel mill at the time.

You can always connect the floating node to ground via a Y cap to stop it flying about so much. This gives the noise a path back to ground without the danger of a DC path popping your drives or controller.