Acquisitions and Dispositions - Pro Forma (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Actual revenue results included in consolidation	$ 35.2	$ 98.8
Actual net income results included in consolidation	2.1	6.9
Revenues	4,535.5	4,200.2	$ 3,690.9
Reported net income (loss) attributable to Brink's	170.6	105.2	$ 16.0
Pro forma revenue results	4,644.7	4,382.4
Pro forma net income results	180.5	114.9
NoteMachine
Business Acquisition [Line Items]
Actual revenue results included in consolidation	35.2
Actual net income results included in consolidation	2.1
Pro forma revenue results	109.2	150.8
Pro forma net income results	$ 9.9	7.2
PAI
Business Acquisition [Line Items]
Actual revenue results included in consolidation		98.8
Actual net income results included in consolidation		6.9
Pro forma revenue results		31.4
Pro forma net income results		$ 2.5