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Earnings Per Common Share (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Basic earnings per common share computation |  |  |
Net income attributable to Unisys Corporation common stockholders | $ 44.0 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 92.3 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 129.4 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average shares | 49,280 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 43,899 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 43,864 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic earnings per common share | $ 0.89 us-gaap_EarningsPerShareBasic | $ 2.10 us-gaap_EarningsPerShareBasic | $ 2.95 us-gaap_EarningsPerShareBasic
Diluted earnings per common share computation |  |  |
Net income attributable to Unisys Corporation common stockholders | 44.0 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 92.3 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 129.4 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Add preferred stock dividends | 2.7 us-gaap_PreferredStockDividendsIncomeStatementImpact | 16.2 us-gaap_PreferredStockDividendsIncomeStatementImpact | 16.2 us-gaap_PreferredStockDividendsIncomeStatementImpact
Net income attributable to Unisys Corporation for diluted earnings per share | $ 44.0 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 92.3 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 145.6 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted average shares | 49,280 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 43,899 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 43,864 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Plus incremental shares from assumed conversions |  |  |
Employee stock plans | 304 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 448 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 439 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Preferred stock |  |  | 6,913 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
Adjusted weighted average shares | 49,584 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,347 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 51,216 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings per common share | $ 0.89 us-gaap_EarningsPerShareDiluted | $ 2.08 us-gaap_EarningsPerShareDiluted | $ 2.84 us-gaap_EarningsPerShareDiluted

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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