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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.

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