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SEGMENT AND RELATED INFORMATION, by Product Category Sales (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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%

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