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Accounting Standards (Detail) - USD ($)
$ in Millions
 3 Months Ended
Jan. 01, 2018
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Revenue from software license extensions and renewals $ 53.0      
Revenue        
Services   $ 568.5 $ 585.3  
Technology   139.9 79.2  
Cost of revenue:        
Services   470.9 486.4 [1]  
Technology   36.3 39.5 [1]  
Selling, general and administrative   90.9 105.0 [1]  
Operating income   101.8 21.8 [1]  
Income before income taxes   62.6 (16.8)  
Provision for income taxes   20.9 12.9  
Consolidated net income   41.7 (29.7)  
Net income attributable to Unisys Corporation   40.6 (32.7)  
Assets        
Accounts receivable, net current   492.5   $ 503.3
Contract assets   46.4   0.0
Inventories   22.2    
Prepaid expenses and other current assets   115.3   126.2
Outsourcing assets, net   213.4   202.3
Deferred income taxes - long-term   116.0   119.9
Other long-term assets   207.1   190.6
Total assets   2,513.7   2,542.4
Liabilities [Abstract]        
Deferred revenue - current   324.8   327.5
Other accrued liabilities - current   344.4   391.5
Long-term deferred revenue   184.9   159.0
Other long-term liabilities   95.9   100.0
Equity [Abstract]        
Accumulated deficit   (1,943.9)   (1,963.1)
Total liabilities and deficit   2,513.7   $ 2,542.4
Accounting Standards Update 2017-07        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net periodic benefit cost, other than service cost     $ 24.5  
Accumulated Deficit | Accounting Standards Update 2014-09        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Increase to accumulated deficit $ 21.4      
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09        
Revenue        
Services   2.8    
Technology   (76.8)    
Cost of revenue:        
Services   1.8    
Technology   (0.9)    
Selling, general and administrative   0.2    
Operating income   (75.1)    
Income before income taxes   (75.1)    
Provision for income taxes   (9.5)    
Consolidated net income   (65.6)    
Net income attributable to Unisys Corporation   (65.6)    
Assets        
Accounts receivable, net current   39.1    
Contract assets   (46.4)    
Inventories   (1.6)    
Prepaid expenses and other current assets   1.5    
Outsourcing assets, net   3.5    
Deferred income taxes - long-term   1.7    
Other long-term assets   (24.1)    
Total assets   (26.3)    
Liabilities [Abstract]        
Deferred revenue - current   15.2    
Other accrued liabilities - current   (11.8)    
Long-term deferred revenue   9.0    
Other long-term liabilities   5.5    
Equity [Abstract]        
Accumulated deficit   (44.2)    
Total liabilities and deficit   (26.3)    
Calculated under Revenue Guidance in Effect before Topic 606        
Revenue        
Services   571.3    
Technology   63.1    
Cost of revenue:        
Services   472.7    
Technology   35.4    
Selling, general and administrative   91.1    
Operating income   26.7    
Income before income taxes   (12.5)    
Provision for income taxes   11.4    
Consolidated net income   (23.9)    
Net income attributable to Unisys Corporation   (25.0)    
Assets        
Accounts receivable, net current   531.6    
Contract assets   0.0    
Inventories   20.6    
Prepaid expenses and other current assets   116.8    
Outsourcing assets, net   216.9    
Deferred income taxes - long-term   117.7    
Other long-term assets   183.0    
Total assets   2,487.4    
Liabilities [Abstract]        
Deferred revenue - current   340.0    
Other accrued liabilities - current   332.6    
Long-term deferred revenue   193.9    
Other long-term liabilities   101.4    
Equity [Abstract]        
Accumulated deficit   (1,988.1)    
Total liabilities and deficit   $ 2,487.4    
[1] *Amounts were changed to conform to the current-year presentation. See Note 3.