From Longman Dictionary of Contemporary Englishriddancerid‧dance /ˈrɪdns/ noun → good riddance (to somebody)
Examples from the Corpus
riddance• If they can't accept me as I am, good riddance.• So any docks, dandelions and creeping buttercup go straight to the tip and good riddance to them too.• But if this is what the club resorts to than good riddance to them.• We were all annoyed with him over not helping with the hay, and I thought good riddance.• Then I thought: good riddance.• Good riddance, she thought, scowling fiercely at the water. 