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Revenue from contracts with customers - disaggregation of revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service $ 928.4 $ 852.4 $ 2,747.4 $ 2,581.2
Core services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 488.9 430.1 1,460.0 1,249.5
High-value services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 402.7 383.0 1,178.2 1,182.3
Other security services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 36.8 39.3 109.2 149.4
Reportable segments        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 924.6 852.4 2,743.9 2,529.8
Reportable segments | Core services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 488.9 430.1 1,460.0 1,231.1
Reportable segments | High-value services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 398.9 383.0 1,174.7 1,149.3
Reportable segments | Other security services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 36.8 39.3 109.2 149.4
Reportable segments | North America        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 446.7 383.4 1,323.7 1,027.5
Reportable segments | North America | Core services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 275.7 236.9 832.7 616.7
Reportable segments | North America | High-value services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 171.0 146.5 491.0 410.8
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 229.0 215.5 684.5 703.6
Reportable segments | South America | Core services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 125.6 104.3 363.6 343.6
Reportable segments | South America | High-value services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 101.1 107.9 313.2 350.6
Reportable segments | South America | Other security services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 2.3 3.3 7.7 9.4
Reportable segments | Rest of World        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 248.9 253.5 735.7 798.7
Reportable segments | Rest of World | Core services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 87.6 88.9 263.7 270.8
Reportable segments | Rest of World | High-value services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 126.8 128.6 370.5 387.9
Reportable segments | Rest of World | Other security services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 34.5 36.0 101.5 140.0
Other items not allocated to segments        
Disaggregation of Revenue [Line Items]        
Acquisitions and dispositions, Revenues (0.2) 0.0 (0.5) 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 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   0.0   18.4
Other items not allocated to segments | High-value services        
Disaggregation of Revenue [Line Items]        
Acquisitions and dispositions, Revenues (0.2)   (0.5)  
Other items not allocated to segments | High-value services | Venezuela        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service   0.0   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
Internal Loss AR Rebuild        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 4.0      
Internal Loss AR Rebuild | Other items not allocated to segments        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service 4.0   4.0  
Internal Loss AR Rebuild | Other items not allocated to segments | High-value services        
Disaggregation of Revenue [Line Items]        
Revenue disaggregated by reportable segment and type of service $ 4.0   $ 4.0