Consolidated Statement of Equity (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Stockholders' Equity [Abstract]
Brink's common shareholders per share declared (dollars per share)	$ 0.86	$ 0.80	$ 0.75
Repurchase shares of Brink's common stock	$ 169.9	$ 52.2	$ 200.0
Accrued liabilities	1,126.9	$ 1,019.4
Share Repurchase Program, Excise Tax	$ 1.4
250 Million Share Repurchase Program II
Stock repurchased and retired during period (in shares)	2,297,955	948,395
Repurchase shares of Brink's common stock	$ 169.9	$ 52.2
Accrued liabilities	$ 2.0