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Capital Stock (Details) - USD ($)		1 Months Ended	3 Months Ended
Capital Stock (Details) - USD ($)	Apr. 14, 2022	Nov. 30, 2021	Mar. 31, 2023	Mar. 31, 2022	May 04, 2023	Jan. 20, 2023	Dec. 31, 2022	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)			46,400,000				46,300,000
Dividends declared (in dollars per share)						$ 0.20
Maximum shares allowed for issuance (in shares)			2,000,000
Par value (in dollars per share)			$ 10
Repurchase shares of Brink's common stock			$ 16,000,000.0	$ 0
Subsequent Event
Subsequent Event [Line Items]
Dividends declared (in dollars per share)					$ 0.22
ASR November 2021
Subsequent Event [Line Items]
Stock repurchased and retired during period (in shares)		1,742,160
Accelerated share repurchased payment		$ 150,000,000
ASR April 2022
Subsequent Event [Line Items]
Stock repurchased and retired during period (in shares)	546,993
ASR, final price per share (in dollars per share)	$ 65.53
250 Million Share Repurchase Program II
Subsequent Event [Line Items]
Stock repurchase program amount			$ 182,000,000					$ 250,000,000
Stock repurchased and retired during period (in shares)			247,422
Repurchase shares of Brink's common stock			$ 16,000,000
Average price per share (in dollars per share)			$ 64.79
250 Million Share Repurchase Program
Subsequent Event [Line Items]
Stock repurchase program amount									$ 250,000,000
Stock repurchased and retired during period (in shares)	2,289,153