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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