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Capital Stock (Details) - USD ($)			1 Months Ended			3 Months Ended		12 Months Ended
Capital Stock (Details) - USD ($)	Aug. 06, 2021	Aug. 26, 2020	Nov. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 24, 2022	Oct. 27, 2021	Feb. 06, 2020
Subsequent Event [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)						47,400,000		47,400,000	49,500,000
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								$ 200,000,000.0	$ 50,000,000.0	$ 0
250 Million Share Repurchase Program
Subsequent Event [Line Items]
Stock repurchase program amount													$ 250,000,000
Stock repurchased and retired during period, shares						1,742,160	655,699	3,494,513	1,096,654
Repurchase shares of Brink's common stock						$ 150,000,000	$ 50,000,000	$ 250,000,000	$ 50,000,000
Average price per share (in dollars per share)						$ 86.10	$ 76.25		$ 45.59
ASR, final price per share (in dollars per share)								$ 71.54
250 Million Share Repurchase Program II
Subsequent Event [Line Items]
Stock repurchase program amount						$ 250,000,000		$ 250,000,000				$ 250,000,000
Subsequent Event
Subsequent Event [Line Items]
Dividend declared (in dollars per share)											$ 0.20
ASR August 2020
Subsequent Event [Line Items]
Stock repurchased and retired during period, shares		849,978
Accelerated share repurchases payment		$ 50,000,000
ASR, initial price per share (in dollars per share)		$ 58.83
ASR September 2020
Subsequent Event [Line Items]
Stock repurchased and retired during period, shares					246,676
ASR August 2021
Subsequent Event [Line Items]
Stock repurchased and retired during period, shares	524,315
Accelerated share repurchases payment	$ 50,000,000
ASR, initial price per share (in dollars per share)	$ 95.36
ASR September 2021
Subsequent Event [Line Items]
Stock repurchased and retired during period, shares				131,384
ASR November 2021
Subsequent Event [Line Items]
Stock repurchased and retired during period, shares			1,742,160
Accelerated share repurchases payment			$ 150,000,000
ASR, initial price per share (in dollars per share)			$ 86.10