Nashville sends Johansen @6.5  million AAV 4 years , less 1.5 million per year retained,  to Edmonton for Neal @ 5.75 AAV 2 years term remaining and Koskinen 4.5 million 1 year term remaining 
Nashville rids themself of the 4 years remaining on Johannsen but takes on cap hit this year. They could opt to buy out either JN or MK's contract. Poile does not typically retain $ but he may have no choice.
Edmonton gets rid of 2 players that no longer fit and gains some cap relief @ 3.75  this year and adds a player who could be a good fit on the top 6.