Revenue from contracts with customers - disaggregation of revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 1,185.4	$ 1,074.0
Reportable segments
Disaggregation of Revenue [Line Items]
Revenues	1,185.4	1,074.0
Reportable segments | Cash and valuables management
Disaggregation of Revenue [Line Items]
Revenues	948.9	916.4
Reportable segments | DRS and AMS
Disaggregation of Revenue [Line Items]
Revenues	236.5	157.6
Reportable segments | North America
Disaggregation of Revenue [Line Items]
Revenues	401.9	368.8
Reportable segments | North America | Cash and valuables management
Disaggregation of Revenue [Line Items]
Revenues	308.0	285.0
Reportable segments | North America | DRS and AMS
Disaggregation of Revenue [Line Items]
Revenues	93.9	83.8
Reportable segments | Latin America
Disaggregation of Revenue [Line Items]
Revenues	315.5	291.3
Reportable segments | Latin America | Cash and valuables management
Disaggregation of Revenue [Line Items]
Revenues	274.3	264.2
Reportable segments | Latin America | DRS and AMS
Disaggregation of Revenue [Line Items]
Revenues	41.2	27.1
Reportable segments | Europe
Disaggregation of Revenue [Line Items]
Revenues	268.7	222.1
Reportable segments | Europe | Cash and valuables management
Disaggregation of Revenue [Line Items]
Revenues	180.1	185.6
Reportable segments | Europe | DRS and AMS
Disaggregation of Revenue [Line Items]
Revenues	88.6	36.5
Reportable segments | Rest of World
Disaggregation of Revenue [Line Items]
Revenues	199.3	191.8
Reportable segments | Rest of World | Cash and valuables management
Disaggregation of Revenue [Line Items]
Revenues	186.5	181.6
Reportable segments | Rest of World | DRS and AMS
Disaggregation of Revenue [Line Items]
Revenues	$ 12.8	$ 10.2