By Amanda Durish Cook NiSource earned $64.4 million ($0.20/share) from continuing operations in the fourth quarter of 2015, below the $79.5 million ($0.25/share) reported for the last three months of 2014. NiSource’s full-year earnings totaled $198.6 million ($0.63/share), compared with $256.2 million ($0.81/share) during 2014. The company split from Columbia...