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Segment information - Customer Revenue by Classes of Similar Products or Services (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue from External Customer [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
Services
Revenue from External Customer [Line Items]
Revenue									2,552.7	2,386.3	2,328.2
Technology
Revenue from External Customer [Line Items]
Revenue									396.0	438.7	413.6
Cloud & infrastructure services | Services
Revenue from External Customer [Line Items]
Revenue									1,567.7	1,363.4	1,334.3
Application services | Services
Revenue from External Customer [Line Items]
Revenue									750.4	772.4	791.0
BPO services | Services
Revenue from External Customer [Line Items]
Revenue									$ 234.6	$ 250.5	$ 202.9

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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