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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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Number Of Customers Accounted For More Than Ten Percentage Of Revenue

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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