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Segment Information - Customer Revenue by Classes of Similar Products or Services (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue from External Customer [Line Items]
Revenues	$ 667.4	$ 666.2	$ 1,375.8	$ 1,330.7
Services
Revenue from External Customer [Line Items]
Revenues	586.7	574.8	1,155.2	1,160.1
Technology
Revenue from External Customer [Line Items]
Revenues	80.7	91.4	220.6	170.6
Cloud & infrastructure services | Services
Revenue from External Customer [Line Items]
Revenues	333.5	330.5	651.9	667.9
Application services | Services
Revenue from External Customer [Line Items]
Revenues	194.0	192.8	386.9	392.2
Business process outsourcing services | Services
Revenue from External Customer [Line Items]
Revenues	$ 59.2	$ 51.5	$ 116.4	$ 100.0

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No definition available.

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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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