Outsourcing assets include equipment and other assets, as well as software development cost and certain cost incurred upon initiation of customer contracts related to initial customer set up costs, used to provide services to outsourcing customers.

No definition available.

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- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(14))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(8))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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- Definition

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=63488584&loc=d3e20235-122688

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Segment information - Revenue, Properties and Outsourcing Assets by Geographic Segment (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 744.8	$ 666.3	$ 666.2	$ 664.5	$ 721.7	$ 683.3	$ 748.9	$ 666.8	$ 2,741.8	$ 2,820.7	$ 3,015.1
Properties, net	142.5				145.3				142.5	145.3	153.8
Outsourcing assets, net	202.3				172.5				202.3	172.5	182.0
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									1,257.0	1,309.3	1,454.9
Properties, net	85.8				91.4				85.8	91.4	96.9
Outsourcing assets, net	81.1				105.1				81.1	105.1	119.4
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									315.8	348.0	375.8
Properties, net	16.7				15.1				16.7	15.1	18.8
Outsourcing assets, net	89.9				39.0				89.9	39.0	36.6
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									1,169.0	1,163.4	1,184.4
Properties, net	40.0				38.8				40.0	38.8	38.1
Outsourcing assets, net	$ 31.3				$ 28.4				$ 31.3	$ 28.4	$ 26.0