Our standard of review of a district court's ruling on a motion pursuant to M. R. Civ. P. 60(b) depends on the nature of the final judgment, order, or proceeding from which relief is sought and the specific basis of the Rule 60(b) motion. "[W]here the movant sought relief under subsection (4) of Rule 60(b) on the ground that the judgment is void, the standard of review is de novo, since the determination that a judgment is or is not void is a conclusion of law." Essex Ins. Co. v. Moose's Saloon, Inc., 2007 MT 202, ¶ 16, 338 Mont. 423, 166 P.3d 451 (citations omitted). See also Greater Missoula Area Fedn. of Early Childhood Educators v. Child Start, Inc., 2009 MT 362, ¶ 18, 353 Mont. 201, 219 P.3d 881.