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Earnings Per Common Share (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Basic earnings per common share computation |  |  |
Net income attributable to Unisys Corporation common stockholders | $ 92.3 | $ 129.4 | $ 120.5
Weighted average shares | 43,899 | 43,864 | 43,145
Basic earnings per common share | $ 2.10 | $ 2.95 | $ 2.79
Diluted earnings per common share computation |  |  |
Net income attributable to Unisys Corporation common stockholders | 92.3 | 129.4 | 120.5
Add preferred stock dividends |  | 16.2 | 13.5
Net income attributable to Unisys Corporation for diluted earnings per share | $ 92.3 | $ 145.6 | $ 134.0
Weighted average shares | 43,899 | 43,864 | 43,145
Plus incremental shares from assumed conversions |  |  |
Employee stock plans | 448 | 439 | 553
Preferred stock |  | 6,913 | 5,780
Adjusted weighted average shares | 44,347 | 51,216 | 49,478
Diluted earnings per common share | $ 2.08 | $ 2.84 | $ 2.71

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