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Revenue from contracts with customers - disaggregation of revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue disaggregated by reportable segment and type of service | $ 826.0 | $ 914.0 | $ 1,698.8 | $ 1,819.0
Core services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue disaggregated by reportable segment and type of service |  | 486.7 |  | 971.1
High-value services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue disaggregated by reportable segment and type of service |  | 390.8 |  | 775.5
Other security services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue disaggregated by reportable segment and type of service |  | 36.5 |  | 72.4
Reportable segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue disaggregated by reportable segment and type of service | 826.0 | 914.3 | 1,698.8 | 1,819.3
Reportable segments | Core services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue disaggregated by reportable segment and type of service | 420.1 | 486.7 | 876.7 | 971.1
Reportable segments | High-value services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue disaggregated by reportable segment and type of service | 365.4 | 391.1 | 747.2 | 775.8
Reportable segments | Other security services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue disaggregated by reportable segment and type of service | 40.5 | 36.5 | 74.9 | 72.4
Reportable segments | North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue disaggregated by reportable segment and type of service | 349.1 | 442.5 | 793.4 | 877.0
Reportable segments | North America | Core services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue disaggregated by reportable segment and type of service | 204.0 | 279.8 | 478.2 | 557.0
Reportable segments | North America | High-value services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue disaggregated by reportable segment and type of service | 145.1 | 162.7 | 315.2 | 320.0
Reportable segments | North America | Other security services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue disaggregated by reportable segment and type of service | 0.0 | 0.0 | 0.0 | 0.0
Reportable segments | South America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue disaggregated by reportable segment and type of service | 158.9 | 225.2 | 356.8 | 455.5
Reportable segments | South America | Core services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue disaggregated by reportable segment and type of service | 87.1 | 118.8 | 187.5 | 238.0
Reportable segments | South America | High-value services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue disaggregated by reportable segment and type of service | 67.7 | 104.0 | 161.5 | 212.1
Reportable segments | South America | Other security services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue disaggregated by reportable segment and type of service | 4.1 | 2.4 | 7.8 | 5.4
Reportable segments | Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue disaggregated by reportable segment and type of service | 318.0 | 246.6 | 548.6 | 486.8
Reportable segments | Rest of World | Core services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue disaggregated by reportable segment and type of service | 129.0 | 88.1 | 211.0 | 176.1
Reportable segments | Rest of World | High-value services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue disaggregated by reportable segment and type of service | 152.6 | 124.4 | 270.5 | 243.7
Reportable segments | Rest of World | Other security services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue disaggregated by reportable segment and type of service | 36.4 | 34.1 | 67.1 | 67.0
Segment Reconciling Items |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Acquisitions and dispositions, Revenues | $ 0.0 | (0.3) | $ 0.0 | (0.3)
Segment Reconciling Items | Core services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Acquisitions and dispositions, Revenues |  | 0.0 |  | 0.0
Segment Reconciling Items | High-value services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Acquisitions and dispositions, Revenues |  | (0.3) |  | (0.3)
Segment Reconciling Items | Other security services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Acquisitions and dispositions, Revenues |  | $ 0.0 |  | $ 0.0

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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