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ACQUISITIONS (Details 2) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
KA Steel [Member] |  |
Business Acquisition [Line Items] |  |
Business Acquisition, Pro Forma Revenue | $ 2,462.6 | $ 2,351.5
Business Acquisition, Pro Forma Net Income (Loss) | 160.1 | 240.0
Business Acquisition, Pro Forma Earnings Per Share, Basic | $ 2.00 | $ 3.00
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ 1.98 | $ 2.97
SunBelt [Member] |  |
Business Acquisition [Line Items] |  |
Business Acquisition, Pro Forma Revenue |  | 1,987.4
Business Acquisition, Pro Forma Net Income (Loss) |  | $ 140.6
Business Acquisition, Pro Forma Earnings Per Share, Basic |  | $ 1.76
Business Acquisition, Pro Forma Earnings Per Share, Diluted |  | $ 1.74

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