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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended	9 Months Ended
	Oct. 03, 2022	Oct. 24, 2022	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021
Subsequent Event [Line Items]
Repurchase shares of Brink's common stock				$ 27.3	$ 50.0
250 Million Share Repurchase Program II
Subsequent Event [Line Items]
Stock repurchased and retired during period (in shares)			501,560
Repurchase shares of Brink's common stock			$ 27.3
Average price per share (in dollars per share)			$ 54.36
Subsequent Event \| 250 Million Share Repurchase Program II
Subsequent Event [Line Items]
Stock repurchased and retired during period (in shares)		324,165
Repurchase shares of Brink's common stock		$ 17.8
Average price per share (in dollars per share)		$ 54.98
Subsequent Event \| NoteMachine
Subsequent Event [Line Items]
Fair value of purchase consideration	$ 177.0