Segment Information Part Three (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Product Category [Abstract]
Consolidated net sales	$ 805.8	$ 849.2	$ 1,686.5	$ 1,762.4
Consolidated net sales (in hundredths)	100.00%	100.00%	100.00%	100.00%
Computers [Member]
Product Category [Abstract]
Consolidated net sales	237.4	238.3	512.4	499.7
Consolidated net sales (in hundredths)	29.50%	28.10%	30.40%	28.30%
Computer Accessories & Software [Member]
Product Category [Abstract]
Consolidated net sales	217.7	237.5	456.7	496.9
Consolidated net sales (in hundredths)	27.00%	28.00%	27.10%	28.20%
Consumer Electronics [Member]
Product Category [Abstract]
Consolidated net sales	117.9	147.7	253.3	314.3
Consolidated net sales (in hundredths)	14.60%	17.40%	15.00%	17.80%
Industrial Products [Member]
Product Category [Abstract]
Consolidated net sales	118.6	102.9	224.2	193.2
Consolidated net sales (in hundredths)	14.70%	12.10%	13.30%	11.00%
Computer Components [Member]
Product Category [Abstract]
Consolidated net sales	90.8	99.5	193.8	207.8
Consolidated net sales (in hundredths)	11.30%	11.70%	11.50%	11.80%
Other [Member]
Product Category [Abstract]
Consolidated net sales	$ 23.4	$ 23.3	$ 46.1	$ 50.5
Consolidated net sales (in hundredths)	2.90%	2.70%	2.70%	2.90%