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Capital Stock (Details) - USD ($)	3 Months Ended				6 Months Ended
Capital Stock (Details) - USD ($)	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Nov. 02, 2023
Equity, Class of Treasury Stock [Line Items]
Shares of common stock authorized (in shares)	100,000,000.0				100,000,000.0		100,000,000.0
Shares issued and outstanding (in shares)	41,800,000				41,800,000		42,900,000
Dividends (dollars per share)	$ 0.2550	$ 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					$ 130,000,000.0	$ 65,700,000
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)					1,485,362
Repurchase shares of Brink's common stock					$ 130,000,000.0
Average price per share (in dollars per share)					$ 87.49
Stock repurchase program remaining amount	$ 166,000,000				$ 166,000,000