* Shares rise on profit beat (Adds CEO comments on Brexit, shares, details): (Reuters) - Phoenix Group, Europe’s largest owner of life assurance funds closed to new customers, expects Britain’s approaching departure from the European Union to push more UK companies to offload risks linked to their pension schemes in 2019. The company also reported higher full-year profit and targeted cash generation of 3.8 billion pounds ($5.01 billion)from 2019 to 2023, more than the 2.5 billion pounds it earlier expected to earn between 2018 and 2022.