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Consolidated Statements of Deficit - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018	Jan. 01, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ (1,326.5)	$ (1,647.4)	$ (1,378.6)
Reclassification pursuant to ASU No. 2018-02	0.0
Consolidated net income (loss)	78.9	(66.6)	(36.7)
Stock-based compensation	11.1	9.0	8.8
Discount on debt issuance			33.6
Capped call on debt issuance			(27.3)
Expenses of convertible notes			(1.2)
Translation adjustments	(81.8)	117.8	(108.4)
Postretirement plans	33.8	265.1	(137.6)
Ending Balance	(1,299.6)	(1,326.5)	(1,647.4)
ASU No. 2016-16
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment					$ (4.4)
ASU No. 2014-09
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment				$ (21.4)
ASU No. 2017-05
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment				6.3
Total Unisys Corporation
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(1,354.7)	(1,631.0)	(1,389.7)
Reclassification pursuant to ASU No. 2018-02	0.0
Consolidated net income (loss)	75.5	(65.3)	(47.7)
Stock-based compensation	11.1	9.0	8.8
Discount on debt issuance			33.6
Capped call on debt issuance			(27.3)
Expenses of convertible notes			(1.2)
Translation adjustments	(79.7)	110.1	(93.3)
Postretirement plans	19.4	226.9	(114.2)
Ending Balance	(1,343.5)	(1,354.7)	(1,631.0)
Total Unisys Corporation | ASU No. 2016-16
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment					(4.4)
Total Unisys Corporation | ASU No. 2014-09
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment				(21.4)
Total Unisys Corporation | ASU No. 2017-05
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment				6.3
Common Stock Par Value
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	0.5	0.5	0.5
Ending Balance	0.5	0.5	0.5
Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(1,963.1)	(1,893.4)	(1,845.7)
Reclassification pursuant to ASU No. 2018-02	208.7
Consolidated net income (loss)	75.5	(65.3)	(47.7)
Ending Balance	(1,694.0)	(1,963.1)	(1,893.4)
Accumulated Deficit | ASU No. 2016-16
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment					$ (4.4)
Accumulated Deficit | ASU No. 2014-09
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment				(21.4)
Accumulated Deficit | ASU No. 2017-05
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect adjustment				$ 6.3
Treasury Stock At Cost
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(102.7)	(100.5)	(100.1)
Stock-based compensation	(2.3)	(2.2)	(0.4)
Ending Balance	(105.0)	(102.7)	(100.5)
Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	4,526.4	4,515.2	4,500.9
Stock-based compensation	13.4	11.2	9.2
Discount on debt issuance			33.6
Capped call on debt issuance			(27.3)
Expenses of convertible notes			(1.2)
Ending Balance	4,539.8	4,526.4	4,515.2
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(3,815.8)	(4,152.8)	(3,945.3)
Reclassification pursuant to ASU No. 2018-02	(208.7)
Translation adjustments	(79.7)	110.1	(93.3)
Postretirement plans	19.4	226.9	(114.2)
Ending Balance	(4,084.8)	(3,815.8)	(4,152.8)
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	28.2	(16.4)	11.1
Consolidated net income (loss)	3.4	(1.3)	11.0
Translation adjustments	(2.1)	7.7	(15.1)
Postretirement plans	14.4	38.2	(23.4)
Ending Balance	$ 43.9	$ 28.2	$ (16.4)

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