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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.

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