Shares in Reckitt Benckiser fell after the household products group announced the departure of chief financial officer Colin Day.The company, whose portfolio includes French's mustard and Nurofen painkillers, said Day was leaving to focus on his portfolio of non-executive positions andother career interests. Earlier this month Day took up a non-executive directorship at engineering and project management group AMEC. He is also a non-executive director at the advertising group WPP and is a Fellow of the Association of Chartered Certified Accountants.'The board has decided that now is a good time to appoint a successor keen to focus on leading the company's finance function in support of the next stage of RB's growth,' Reckitt said as it announced Day's departure.'During his tenure he has made a significant contribution to the performance of the business,' Reckitt said. 'Our appreciation is in particular for ensuring strong financial management and control, overseeing excellent cash generation and working with the leadership team on a number of key strategic acquisitions.'