(Reuters) – FleetCor Technologies Inc said it would buy payments processing company Comdata Inc from Ceridian LLC for $3.45 billion in its biggest deal as it looks to expand into the virtual payments market. Comdata, which was acquired by payroll and employee benefits processing company Ceridian in 1995 for $900 million, provides fleet fuel cards for the trucking industry, payroll cards and gift cards among other services. Thomas H. Lee and Fidelity National Financial Inc took over Comdata in 2007 as part of their $5.3 billion acquisition of Ceridian. Ceridian was separated from Comdata last year.