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Segment Information - Additional Information (Detail) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) segment customer | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 760.9 | $ 688.3 | $ 667.4 | $ 708.4 | $ 744.8 | $ 666.3 | $ 666.2 | $ 664.5 | $ 2,825.0 | $ 2,741.8 |  | $ 2,820.7 |
Number of business segments | segment |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  | $ 284.1 | 97.1 | [1] | 129.2 | [1]
Number of customers accounted for more than 10% of revenue | customer |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Various Agencies Of U.S. Government |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | $ 574.0 | 571.0 |  | 564.0 |
Other Technology | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  | 4.2 | 6.3 |  | 0.7 |
Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 438.7 | 413.6 |  | 414.4 |
Operating profit (loss) |  |  |  |  |  |  |  |  |  | $ 237.8 | $ 170.6 |  | $ 161.5 |
Technology | Software License Extensions and Renewals |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 53.0 |  |  |  | $ 53.0 |  |  |  |  |  |  |  |  |
[1] | Amounts were changed to conform to the current-year presentation. See Note 2.

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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