Target Corp. said Tuesday that it will stop offering health insurance to its part-time employees because new online health exchanges offer workers an opportunity to buy coverage. The Minneapolis-based retailer will give each worker $500 to help buy health insurance, and has arranged for one-on-one consultations with benefits manager Towers Watson to help with the transition. The retailer announced the decision through its online site, “A Bullseye View: Behind the Scenes at Target,” in a Q&A with Jodee Kozlak, Target’s executive vice president of human resources. In the article, Kozlak acknowledged the disruption to workers. But she said the exchanges...