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Accounting Standards (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 01, 2018
Jan. 01, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Reclassification pursuant to ASU No. 2018-02     $ 0.0                
Revenue                      
Revenue     688.3     $ 666.3     $ 2,064.1 $ 1,997.0  
Cost of revenue:                      
Cost of revenue     534.5     562.7 [1]     1,556.2 1,636.1 [1]  
Selling, general and administrative     90.9     97.8 [1]     274.5 314.2 [1]  
Operating income     55.8     (2.9) [1]     211.6 15.4  
Income before income taxes     22.2     (40.4)     105.1 (99.5)  
Provision for income taxes     15.2     12.5     50.4 21.6  
Consolidated net income (loss)     7.0 $ 6.0 $ 41.7 (52.9) $ (38.5) $ (29.7) 54.7 (121.1)  
Net income (loss) attributable to Unisys Corporation     6.1     (41.1)     50.5 (115.8)  
Assets                      
Accounts receivable, net current     492.2           492.2   $ 503.3
Contract assets     73.3           73.3   0.0
Inventories     23.0           23.0    
Prepaid expenses and other current assets     102.6           102.6   126.2
Deferred income taxes - long-term     97.3           97.3   119.9
Other long-term assets     193.6           193.6   190.6
Total assets     2,328.0           2,328.0   2,542.4
Liabilities                      
Deferred revenue - current     254.7           254.7   327.5
Other accrued liabilities - current     351.9           351.9   391.5
Long-term deferred revenue     167.4           167.4   159.0
Other long-term liabilities     68.1           68.1   100.0
Equity                      
Accumulated deficit     (1,725.3)           (1,725.3)   (1,963.1)
Total liabilities and deficit     2,328.0           2,328.0   2,542.4
Services                      
Revenue                      
Revenue     605.6     575.5     1,760.8 1,735.6  
Cost of revenue:                      
Cost of revenue     504.9     522.5 [1]     1,460.0 1,519.7 [1]  
Operating income     18.6     18.7     54.3 36.6  
Technology                      
Revenue                      
Revenue     82.7     90.8     303.3 261.4  
Cost of revenue:                      
Cost of revenue     29.6     40.2 [1]     96.2 116.4 [1]  
Operating income     34.5     29.6     154.7 77.0  
Technology | Software License Extensions and Renewals                      
Revenue                      
Revenue   $ 53.0     53.0       53.0    
Balances Without Adoption of Topic 606                      
Cost of revenue:                      
Selling, general and administrative     91.2           275.2    
Operating income     45.1           106.9    
Income before income taxes     11.5           0.4    
Provision for income taxes     9.9           35.7    
Consolidated net income (loss)     1.6           (35.3)    
Net income (loss) attributable to Unisys Corporation     0.7           (39.5)    
Assets                      
Accounts receivable, net current     555.7           555.7    
Contract assets     0.0           0.0    
Inventories     27.6           27.6    
Prepaid expenses and other current assets     103.5           103.5    
Deferred income taxes - long-term     99.0           99.0    
Other long-term assets     171.1           171.1    
Total assets     2,302.9           2,302.9    
Liabilities                      
Deferred revenue - current     301.2           301.2    
Other accrued liabilities - current     335.1           335.1    
Long-term deferred revenue     175.8           175.8    
Other long-term liabilities     73.6           73.6    
Equity                      
Accumulated deficit     (1,794.0)           (1,794.0)    
Total liabilities and deficit     2,302.9           2,302.9    
Balances Without Adoption of Topic 606 | Services                      
Revenue                      
Revenue     602.5           1,755.2    
Cost of revenue:                      
Cost of revenue     504.0           1,457.8    
Balances Without Adoption of Topic 606 | Technology                      
Revenue                      
Revenue     74.6           202.2    
Cost of revenue:                      
Cost of revenue     29.8           95.7    
AOCI                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Reclassification pursuant to ASU No. 2018-02 $ (208.7)   (208.7)           (208.7)    
Retained Earnings                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Reclassification pursuant to ASU No. 2018-02     208.7                
Cost of revenue:                      
Consolidated net income (loss)     6.1 $ 3.8 $ 40.6 (41.1) $ (42.0) $ (32.7)      
Accounting Standards Update 2017-07                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net periodic benefit cost, other than service cost           $ 24.1       $ 69.9  
Accounting Standards Update 2014-09                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Increase to accumulated deficit                     21.4
Accounting Standards Update 2014-09 | Adjustments                      
Cost of revenue:                      
Selling, general and administrative     0.3           0.7    
Operating income     (10.7)           (104.7)    
Income before income taxes     (10.7)           (104.7)    
Provision for income taxes     (5.3)           (14.7)    
Consolidated net income (loss)     (5.4)           (90.0)    
Net income (loss) attributable to Unisys Corporation     (5.4)           (90.0)    
Assets                      
Accounts receivable, net current     63.5           63.5    
Contract assets     (73.3)           (73.3)    
Inventories     4.6           4.6    
Prepaid expenses and other current assets     0.9           0.9    
Deferred income taxes - long-term     1.7           1.7    
Other long-term assets     (22.5)           (22.5)    
Total assets     (25.1)           (25.1)    
Liabilities                      
Deferred revenue - current     46.5           46.5    
Other accrued liabilities - current     (16.8)           (16.8)    
Long-term deferred revenue     8.4           8.4    
Other long-term liabilities     5.5           5.5    
Equity                      
Accumulated deficit     (68.7)           (68.7)    
Total liabilities and deficit     (25.1)           (25.1)    
Accounting Standards Update 2014-09 | Adjustments | Services                      
Revenue                      
Revenue     (3.1)           (5.6)    
Cost of revenue:                      
Cost of revenue     (0.9)           (2.2)    
Accounting Standards Update 2014-09 | Adjustments | Technology                      
Revenue                      
Revenue     (8.1)           (101.1)    
Cost of revenue:                      
Cost of revenue     $ 0.2           $ (0.5)    
Accounting Standards Update 2014-09 | Retained Earnings                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Increase to accumulated deficit   $ 21.4                 $ 21.4
[1] Amounts were changed to conform to the current-year presentation. See Note 3.