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Segment Information - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) Segment Customer	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Segment Reporting Information [Line Items]
Number of operating business segments | Segment	2
Operating profit (loss)	$ (55.1)	$ 154.9	$ 219.5
Number of Customers Accounted for more than 10% of revenue | Customer	0
Revenues	$ 3,015.1	3,356.4	3,456.5
Various Agencies Of U.S. Government
Segment Reporting Information [Line Items]
Revenues	569.0	529.0	512.0
Other Technology | Segment Reconciling Items
Segment Reporting Information [Line Items]
Operating profit (loss)	$ 9.2	$ 17.0	$ 6.0

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Number Of Customers Accounted For More Than Ten Percentage Of Revenue

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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.

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The net result for the period of deducting operating expenses from operating revenues.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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