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Segment Information - Additional Information (Detail) $ in Millions		3 Months Ended				9 Months Ended
	Jan. 01, 2018 USD ($)	Sep. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2017 USD ($)		Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)
Segment Reporting Information [Line Items]
Revenue		$ 688.3		$ 666.3		$ 2,064.1	$ 1,997.0
Number of business segments | segment						2
Operating income (loss)		55.8		(2.9)	[1]	$ 211.6	15.4
Other Technology | Segment Reconciling Items
Segment Reporting Information [Line Items]
Operating income (loss)		0.1		0.0		2.3	1.0
Technology
Segment Reporting Information [Line Items]
Revenue		82.7		90.8		303.3	261.4
Operating income (loss)		$ 34.5		$ 29.6		154.7	$ 77.0
Technology | Software License Extensions and Renewals
Segment Reporting Information [Line Items]
Revenue	$ 53.0		$ 53.0			$ 53.0
[1] Amounts were changed to conform to the current-year presentation. See Note 3.

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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.

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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).

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