SEGMENT AND RELATED INFORMATION, by Product Category Sales (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Product Category [Abstract]
Consolidated net sales	$ 874.2	$ 791.8	$ 805.7	$ 880.6	$ 935.1	$ 847.0	$ 849.1	$ 913.1	$ 3,352.3	$ 3,544.3	$ 3,680.6
Consolidated net sales (in hundredths)									100.00%	100.00%	100.00%
Computers [Member]
Product Category [Abstract]
Consolidated net sales									1,034.5	1,046.4	1,047.6
Consolidated net sales (in hundredths)									30.90%	29.50%	28.50%
Computer Accessories & Software [Member]
Product Category [Abstract]
Consolidated net sales									877.6	971.3	1,025.0
Consolidated net sales (in hundredths)									26.20%	27.40%	27.80%
Consumer Electronics [Member]
Product Category [Abstract]
Consolidated net sales									495.1	615.6	746.5
Consolidated net sales (in hundredths)									14.80%	17.40%	20.30%
Industrial Products [Member]
Product Category [Abstract]
Consolidated net sales									473.8	401.9	319.9
Consolidated net sales (in hundredths)									14.10%	11.30%	8.70%
Computer Components [Member]
Product Category [Abstract]
Consolidated net sales									378.0	407.7	453.8
Consolidated net sales (in hundredths)									11.30%	11.50%	12.30%
Other Products [Member]
Product Category [Abstract]
Consolidated net sales									$ 93.3	$ 101.4	$ 87.8
Consolidated net sales (in hundredths)									2.70%	2.90%	2.40%