A mobile handling device that is arranged as a mobile work machine, the mobile handling device comprising: - an undercarriage comprising a travel drive, - a body that supports a controllable boom, and - an attachment for material-removing processing or smoothing processing walls or ceilings, wherein the attachment is supported at a mounting interface of the boom and comprises: - a mounting unit for a mounting to the mounting interface of the handling device, wherein the mounting unit provides at least two swivel positions (190, 192, 194) for the attachment that are offset from one another, and - a processing head that is arranged to be equipped with at least one tool for material-removing processing or smoothing processing, characterized by - a compensation arrangement arranged between the mounting unit and the processing head and defining a longitudinal axis, wherein the processing head is movable relative to the mounting unit in a longitudinal direction along the longitudinal axis, wherein the compensation arrangement is arranged to provide a defined contact pressure force for the processing head in a defined operating range along the longitudinal axis towards the surface to be processed, wherein in the operating range of the compensation arrangement, compensating movements along the longitudinal axis of at least 200 mm, in terms of absolute value, are enabled, and wherein the attachment is operable independently of control commands from the handling device and movable along a surface to be processed. - an undercarriage comprising a travel drive, - a body that supports a controllable boom, and - an attachment for material-removing processing or smoothing processing walls or ceilings, wherein the attachment is supported at a mounting interface of the boom and comprises: - a mounting unit for a mounting to the mounting interface of the handling device, wherein the mounting unit provides at least two swivel positions (190, 192, 194) for the attachment that are offset from one another, and - a processing head that is arranged to be equipped with at least one tool for material-removing processing or smoothing processing, characterized by - a compensation arrangement arranged between the mounting unit and the processing head and defining a longitudinal axis, wherein the processing head is movable relative to the mounting unit in a longitudinal direction along the longitudinal axis, wherein the compensation arrangement is arranged to provide a defined contact pressure force for the processing head in a defined operating range along the longitudinal axis towards the surface to be processed, wherein in the operating range of the compensation arrangement, compensating movements along the longitudinal axis of at least 200 mm, in terms of absolute value, are enabled, and wherein the attachment is operable independently of control commands from the handling device and movable along a surface to be processed. - a mounting unit for a mounting to the mounting interface of the handling device, wherein the mounting unit provides at least two swivel positions (190, 192, 194) for the attachment that are offset from one another, and - a processing head that is arranged to be equipped with at least one tool for material-removing processing or smoothing processing, characterized by - a compensation arrangement arranged between the mounting unit and the processing head and defining a longitudinal axis, wherein the processing head is movable relative to the mounting unit in a longitudinal direction along the longitudinal axis, wherein the compensation arrangement is arranged to provide a defined contact pressure force for the processing head in a defined operating range along the longitudinal axis towards the surface to be processed, wherein in the operating range of the compensation arrangement, compensating movements along the longitudinal axis of at least 200 mm, in terms of absolute value, are enabled, and wherein the attachment is operable independently of control commands from the handling device and movable along a surface to be processed. wherein the processing head is movable relative to the mounting unit in a longitudinal direction along the longitudinal axis, wherein the compensation arrangement is arranged to provide a defined contact pressure force for the processing head in a defined operating range along the longitudinal axis towards the surface to be processed, wherein in the operating range of the compensation arrangement, compensating movements along the longitudinal axis of at least 200 mm, in terms of absolute value, are enabled, and wherein the attachment is operable independently of control commands from the handling device and movable along a surface to be processed.