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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

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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 + Details
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