Revenue from contracts with customers - Disaggregation of revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue disaggregated by reportable segment and type of service	$ 4,535.5	$ 4,200.2	$ 3,690.9
Reportable Segments
Disaggregation of Revenue [Line Items]
Revenue disaggregated by reportable segment and type of service	4,535.5	4,200.2	3,690.9
Reportable Segments | Cash and valuables management
Disaggregation of Revenue [Line Items]
Revenue disaggregated by reportable segment and type of service	3,792.1	3,669.8	3,332.0
Reportable Segments | DRS and AMS
Disaggregation of Revenue [Line Items]
Revenue disaggregated by reportable segment and type of service	743.4	530.4	358.9
North America | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenue disaggregated by reportable segment and type of service	1,584.1	1,407.1	1,261.4
North America | Reportable Segments | Cash and valuables management
Disaggregation of Revenue [Line Items]
Revenue disaggregated by reportable segment and type of service	1,207.2	1,122.3	1,077.9
North America | Reportable Segments | DRS and AMS
Disaggregation of Revenue [Line Items]
Revenue disaggregated by reportable segment and type of service	376.9	284.8	183.5
Latin America | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenue disaggregated by reportable segment and type of service	1,210.6	1,126.0	1,071.9
Latin America | Reportable Segments | Cash and valuables management
Disaggregation of Revenue [Line Items]
Revenue disaggregated by reportable segment and type of service	1,090.3	1,030.9	994.9
Latin America | Reportable Segments | DRS and AMS
Disaggregation of Revenue [Line Items]
Revenue disaggregated by reportable segment and type of service	120.3	95.1	77.0
Europe | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenue disaggregated by reportable segment and type of service	931.4	917.3	753.8
Europe | Reportable Segments | Cash and valuables management
Disaggregation of Revenue [Line Items]
Revenue disaggregated by reportable segment and type of service	728.1	802.6	678.1
Europe | Reportable Segments | DRS and AMS
Disaggregation of Revenue [Line Items]
Revenue disaggregated by reportable segment and type of service	203.3	114.7	75.7
Rest of World | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenue disaggregated by reportable segment and type of service	809.4	749.8	603.8
Rest of World | Reportable Segments | Cash and valuables management
Disaggregation of Revenue [Line Items]
Revenue disaggregated by reportable segment and type of service	766.5	714.0	581.1
Rest of World | Reportable Segments | DRS and AMS
Disaggregation of Revenue [Line Items]
Revenue disaggregated by reportable segment and type of service	$ 42.9	$ 35.8	$ 22.7