ADP, a provider of business outsourcing solutions, completed the acquisition of Celergo, a provider of global payroll management services, from Frontier. Financial terms were not disclosed. The acquisition will enhance ADP's international payroll offerings with a strong platform and new solutions, including cross-currency and expatriate payment services. "Celergo enhances ADP's multi-country payroll capabilities in a rapidly evolving global market and will improve the client experience and drive revenue growth. This builds on our recent acquisitions of Global Cash Card and WorkMarket, all of which address a changing workforce that is increasingly global, freelance or part-time, and requires flexible payment solutions," Carlos Rodriguez, ADP President and CEO.