The combination of finite and boundary element methods for the numerical solution of coupled problems has a long tradition. It has proved to be the method of choice for several applications among which are the acoustic-structure coupling or the soil-structure interaction. In this work, the concept of combining these two approximation methods is carried forward to dynamic problems by developing a coupling framework in which the local discretization method can be chosen independently. In fact, a Lagrange multiplier domain decomposition approach is preferred which allows for the most flexible combination of discretization methods within the same solution algorithm. Therefore, Dirchlet-to-Neumann maps are realized on the discrete level for the static case or at each time step for the dynamic case. Moreover, the treatment of nonconforming interface meshes, i.e., interface discretizations which do not have coincident nodes or equal interpolation orders, is included easily into this approach.