Condensed Consolidated Statement of Equity (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022
Statement of Stockholders' Equity [Abstract]
Dividends (dollars per share)	$ 0.22	$ 0.22	$ 0.20	$ 0.20	$ 0.20	$ 0.20
Accrued liabilities	$ 1,016.7
Share Repurchase Program, Excise Tax	$ 0.8
250 Million Share Repurchase Program II
Stock repurchased and retired during period (in shares)	1,181,106			501,560
Repurchase shares of Brink's common stock	$ 88.2			$ 27.3
Accrued liabilities	$ 1.8			$ 3.2