What force is when a ball rolls across the floor?

The force that stopped it is a resistive force. Assuming there are no external force acting on it, Friction is the cause.

When the ball is rolled, a force is applied. According to Newton's second law, F=ma, There is an acceleration, thus increase in velocity. At that same instance, when the ball moves, a natural resistive force, friction is produced. However at the next instance, there is no force pushing the ball, since friction exists when there is velocity, there will be a net force against the direction of travel. Thus generating a Deceleration. This happens till the ball comes to a stop, when it do not have any more speed. "Friction exists when there is motion" - this is a derivation from Newtons Third Law of motion. when the ball is moving it applies some force on ground so the ground also applies an equal and opposite force on the rolling ball. But since the vector component of the force on the ball that set it into motion is larger it keeps rolling till the time the Frictional force can bring it to an complete halt.