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Segment Information - Additional Information (Detail) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) customer segment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 741.5 | $ 757.6 | $ 753.8 | $ 695.8 | $ 760.9 | $ 688.3 | $ 667.4 | $ 708.4 | $ 2,948.7 | $ 2,825.0 | $ 2,741.8
Number of business segments | segment |  |  |  |  |  |  |  |  |  | 2 |  |
Profit included in operating income |  |  |  |  |  |  |  |  |  | $ 238.2 | 284.1 | 97.1
Number of customers accounted for more than 10% of revenue | customer |  |  |  |  |  |  |  |  |  | 0 |  |
Various Agencies Of U.S. Government |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | $ 726.0 | 574.0 | 571.0
Technology |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 396.0 | 438.7 | 413.6
Profit included in operating income |  |  |  |  |  |  |  |  |  | 172.2 | 237.8 | 170.6
Technology | Software License Extensions and Renewals |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 53.0 |  |  |  |  |  |  |  | $ 53.0 |  |  |
Technology | Other Technology | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Profit included in operating income |  |  |  |  |  |  |  |  |  | $ 5.7 | $ 4.2 | $ 6.3

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