Segment Information Part Three (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Product Category [Abstract]
Consolidated net sales	$ 880.7	$ 913.2
Consolidated net sales (in hundredths)	100.00%	100.00%
Computers [Member]
Product Category [Abstract]
Consolidated net sales	275.1	261.4
Consolidated net sales (in hundredths)	31.00%	29.00%
Computer Accessories & Software [Member]
Product Category [Abstract]
Consolidated net sales	239.0	259.4
Consolidated net sales (in hundredths)	27.00%	28.00%
Consumer Electronics [Member]
Product Category [Abstract]
Consolidated net sales	135.4	166.5
Consolidated net sales (in hundredths)	15.00%	18.00%
Industrial Products [Member]
Product Category [Abstract]
Consolidated net sales	105.6	90.4
Consolidated net sales (in hundredths)	12.00%	10.00%
Computer Components [Member]
Product Category [Abstract]
Consolidated net sales	103.0	108.3
Consolidated net sales (in hundredths)	12.00%	12.00%
Other [Member]
Product Category [Abstract]
Consolidated net sales	$ 22.6	$ 27.2
Consolidated net sales (in hundredths)	3.00%	3.00%