SEGMENT AND RELATED INFORMATION, by Product Category Sales (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Product Category [Abstract]
Consolidated net sales	$ 935.2	$ 846.3	$ 849.5	$ 913.6	$ 978.4	$ 900.2	$ 872.2	$ 929.8	$ 3,544.6	$ 3,680.6	$ 3,589.1
Consolidated net sales (in hundredths)									100.00%	100.00%	100.00%
Computers [Member]
Product Category [Abstract]
Consolidated net sales									1,048.3	1,047.6	878.4
Consolidated net sales (in hundredths)									29.60%	28.50%	24.50%
Computer Accessories & Software [Member]
Product Category [Abstract]
Consolidated net sales									970.8	1,025.0	982.8
Consolidated net sales (in hundredths)									27.40%	27.80%	27.40%
Consumer Electronics [Member]
Product Category [Abstract]
Consolidated net sales									619.7	746.5	856.3
Consolidated net sales (in hundredths)									17.50%	20.30%	23.80%
Computer Components [Member]
Product Category [Abstract]
Consolidated net sales									407.6	453.8	551.0
Consolidated net sales (in hundredths)									11.50%	12.30%	15.30%
Industrial Products [Member]
Product Category [Abstract]
Consolidated net sales									401.9	319.9	250.0
Consolidated net sales (in hundredths)									11.30%	8.70%	7.00%
Other Products [Member]
Product Category [Abstract]
Consolidated net sales									$ 96.3	$ 87.8	$ 70.6
Consolidated net sales (in hundredths)									2.70%	2.40%	2.00%