Capital Stock (Details) - USD ($)		1 Months Ended	3 Months Ended	9 Months Ended
	Apr. 14, 2022	Nov. 30, 2021	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Jul. 29, 2022	Dec. 31, 2021	Oct. 27, 2021	Feb. 06, 2020
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)			46,700,000	46,700,000			47,400,000
Dividends declared (in dollars per share)						$ 0.20
Maximum shares allowed for issuance (in shares)			2,000,000	2,000,000
Par value (in dollars per share)			$ 10	$ 10
Repurchase shares of Brink's common stock				$ 27,300,000	$ 50,000,000.0
ASR November 2021
Equity, Class of Treasury Stock [Line Items]
Stock repurchased and retired during period (in shares)		1,742,160
Accelerated share repurchased payment		$ 150,000,000
ASR April 2022
Equity, Class of Treasury Stock [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
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program amount			$ 223,000,000	$ 223,000,000				$ 250,000,000
Stock repurchased and retired during period (in shares)			501,560
Repurchase shares of Brink's common stock			$ 27,300,000
Average price per share (in dollars per share)			$ 54.36
250 Million Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program amount									$ 250,000,000
Stock repurchased and retired during period (in shares)	2,289,153