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Revenue from contracts with customers - disaggregation of revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service $ 914.0 $ 849.7 $ 1,819.0 $ 1,728.8
Core services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 486.7 399.7 971.1 819.4
High-value services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 390.8 397.2 775.5 799.3
Other security services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 36.5 52.8 72.4 110.1
Reportable segments        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 914.3 824.1 1,819.3 1,677.4
Reportable segments | Core services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 486.7 392.0 971.1 801.0
Reportable segments | High-value services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 391.1 379.3 775.8 766.3
Reportable segments | Other security services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 36.5 52.8 72.4 110.1
Reportable segments | North America        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 442.5 324.0 877.0 644.1
Reportable segments | North America | Core services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 279.8 189.8 557.0 379.8
Reportable segments | North America | High-value services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 162.7 134.2 320.0 264.3
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 225.2 233.3 455.5 488.1
Reportable segments | South America | Core services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 118.8 113.9 238.0 239.3
Reportable segments | South America | High-value services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 104.0 116.2 212.1 242.7
Reportable segments | South America | Other security services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 2.4 3.2 5.4 6.1
Reportable segments | Rest of World        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 246.6 266.8 486.8 545.2
Reportable segments | Rest of World | Core services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 88.1 88.3 176.1 181.9
Reportable segments | Rest of World | High-value services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 124.4 128.9 243.7 259.3
Reportable segments | Rest of World | Other security services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 34.1 49.6 67.0 104.0
Other items not allocated to segments        
Disaggregation of Revenue [Line Items]        
Acquisitions and dispositions, Revenues (0.3) 0.0 (0.3) 0.0
Other items not allocated to segments | Venezuela        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 0.0 25.6 0.0 51.4
Other items not allocated to segments | Core services        
Disaggregation of Revenue [Line Items]        
Acquisitions and dispositions, Revenues 0.0   0.0  
Other items not allocated to segments | Core services | Venezuela        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service   7.7   18.4
Other items not allocated to segments | High-value services        
Disaggregation of Revenue [Line Items]        
Acquisitions and dispositions, Revenues (0.3)   (0.3)  
Other items not allocated to segments | High-value services | Venezuela        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service   17.9   33.0
Other items not allocated to segments | Other security services        
Disaggregation of Revenue [Line Items]        
Acquisitions and dispositions, Revenues $ 0.0   $ 0.0  
Other items not allocated to segments | Other security services | Venezuela        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service   $ 0.0   $ 0.0