[["( amounts in millions )", "2013", "2012"], ["trade and other accounts receivable", "$ 546.5", "$ 516.9"], ["allowances for doubtful accounts", "-14.9 ( 14.9 )", "-19.0 ( 19.0 )"], ["total trade and other accounts receivable 2013 net", "$ 531.6", "$ 497.9"]]