The deal, which was first reported by The Athletic, includes $500,000 in performance bonuses each year.
The left-handed Wilson has an upper-90s fastball, and on the surface, he had a solid year for the Chicago Cubs in 2018, going 4-5 with a 3.46 ERA in 71 appearances while striking out 69 in 54 2/3 innings.
But there were times of inconsistency, which might follow him to his new team. Simply put, he walked too many batters (33). However, he was especially effective against left-handed hitters, who hit only .190 off him while reaching base just 30 percent of the time -- much better than the .350 on-base mark he compiled against righties.
A sign of his up-and-down performance can be seen in the win probability stat: He was a sum 0.0 -- plus-4.8 in positive events and a minus-4.8 in negative events. Overall, he was effective, just not always reliable in some big spots.
Wilson is 26-19 with a 3.33 ERA in 412 relief appearances over six big league seasons that also included time with the Pittsburgh Pirates (2012-14), New York Yankees (2015) and Detroit Tigers (2016-17).
ESPN's Jesse Rogers and The Associated Press contributed to this report.