Madison Dearborn Partners-backed RDX, a specialized provider of managed IT services, and Charter Communications, an American telecommunications and mass media company, acquired Navisite, a leading provider of managed cloud services. Financial terms were not disclosed. Within the Madison Dearborn Partners investment portfolio, RDX will own and operate the assets including client relationships, employees dedicated to supporting the Navisite business, fixed assets, leases and Navisite-operated facilities.