[["", "2010", "2009", "2008"], ["balance at beginning of year", "$ 55.2", "$ 65.7", "$ 14.7"], ["additions charged to expense", "23.6", "27.3", "36.5"], ["accounts written-off", "-27.9 ( 27.9 )", "-37.8 ( 37.8 )", "-12.7 ( 12.7 )"], ["acquisitions", "-", "-", "27.2"], ["balance at end of year", "$ 50.9", "$ 55.2", "$ 65.7"]]