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Capital Stock (Details) - USD ($)	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Nov. 02, 2023
Equity, Class of Treasury Stock [Line Items]
Shares of common stock authorized (in shares)	100,000,000						100,000,000		100,000,000.0
Shares issued and outstanding (in shares)	41,600,000						41,600,000		42,900,000
Dividends (dollars per share)	$ 0.2550	$ 0.2550	$ 0.2425	$ 0.2425	$ 0.2425	$ 0.2200
Maximum shares allowed for issuance (in shares)	2,000,000.0						2,000,000.0
Par value (in dollars per share)	$ 10						$ 10
Repurchase shares of Brink's common stock							$ 153,600,000	$ 125,300,000
500 Million Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program amount										$ 500,000,000
Stock repurchased and retired during period (in shares)							1,724,309
Repurchase shares of Brink's common stock							$ 153,600,000
Average price per share (in dollars per share)							$ 89.05
Stock repurchase program remaining amount	$ 143,000,000						$ 143,000,000
O 2025 M7 Dividends
Equity, Class of Treasury Stock [Line Items]
Dividends (dollars per share)	$ 0.2550
O 2025 M9 Dividends
Equity, Class of Treasury Stock [Line Items]
Dividends (dollars per share)	$ 0.2550

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