Capital Stock (Details) - USD ($)		12 Months Ended
	Apr. 14, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Sep. 19, 2024	Nov. 02, 2023	Oct. 27, 2021	Feb. 06, 2020
Subsequent Event [Line Items]
Shares of common stock authorized (in shares)		100,000,000.0	100,000,000.0
Shares issued and outstanding (in shares)		42,900,000	44,500,000
Dividend declared (in dollars per share)					$ 0.2425
Maximum shares allowed for issuance (in shares)		2,000,000.0
Par value (in dollars per share)		$ 10
Repurchase shares of Brink's common stock		$ 203,600,000	$ 169,900,000	$ 52,200,000
500 Million Share Repurchase Program
Subsequent Event [Line Items]
Stock repurchase program amount						$ 500,000,000
Stock repurchased and retired during period (in shares)		2,108,544
Repurchase shares of Brink's common stock		$ 203,600,000
Average price per share (in dollars per share)		$ 96.54
Stock repurchase program remaining amount		$ 296,000,000
250 Million Share Repurchase Program II
Subsequent Event [Line Items]
Stock repurchase program amount							$ 250,000,000
Stock repurchased and retired during period (in shares)			2,297,955	948,395
Repurchase shares of Brink's common stock			$ 169,900,000	$ 52,200,000
Average price per share (in dollars per share)			$ 73.92	$ 55.01
Stock repurchase program remaining amount			$ 28,000,000
250 Million Share Repurchase Program
Subsequent Event [Line Items]
Stock repurchase program amount								$ 250,000,000
ASR April 2022
Subsequent Event [Line Items]
Stock repurchased and retired during period (in shares)	546,993