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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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 721.7	$ 683.3	$ 748.9	$ 666.8	$ 789.9	$ 739.2	$ 764.8	$ 721.2	$ 2,820.7	$ 3,015.1	$ 3,356.4
Properties, net	145.3				153.8				145.3	153.8	168.7
Outsourcing assets, net	172.5				182.0				172.5	182.0	150.9
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									1,309.3	1,454.9	1,378.1
Properties, net	91.4				96.9				91.4	96.9	111.9
Outsourcing assets, net	105.1				119.4				105.1	119.4	99.7
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									348.0	375.8	435.4
Properties, net	15.1				18.8				15.1	18.8	22.0
Outsourcing assets, net	39.0				36.6				39.0	36.6	25.8
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									1,163.4	1,184.4	1,542.9
Properties, net	38.8				38.1				38.8	38.1	34.8
Outsourcing assets, net	$ 28.4				$ 26.0				$ 28.4	$ 26.0	$ 25.4

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- Definition

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No definition available.

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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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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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