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Capital Stock (Details) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 14, 2022 | Aug. 06, 2021 | Aug. 26, 2020 | Nov. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Apr. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 21, 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) |  |  |  |  |  |  |  |  | 46,300,000 | 47,400,000 |  |  |  |
Dividend 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 |  |  |  |  |  |  |  |  | $ 52,200,000 | $ 200,000,000.0 | $ 50,000,000.0 |  |  |
250 Million Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000
Stock repurchased and retired during period, shares |  |  |  |  |  |  | 655,699 | 2,289,153 | 4,041,506 |  | 1,096,654 |  |  |
Repurchase shares of Brink's common stock |  |  |  |  |  |  | $ 50,000,000 | $ 150,000,000 | $ 250,000,000 |  | $ 50,000,000 |  |  |
Average price per share (in dollars per share) |  |  |  |  |  |  | $ 76.25 | $ 65.53 |  |  | $ 45.59 |  |  |
ASR, final price per share (in dollars per share) |  |  |  |  |  |  |  |  | $ 61.86 |  |  |  |  |
250 Million Share Repurchase Program II |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000 |
Stock repurchased and retired during period, shares |  |  |  |  |  |  |  |  | 948,395 |  |  |  |  |
Repurchase shares of Brink's common stock |  |  |  |  |  |  |  |  | $ 52,200,000 |  |  |  |  |
Average price per share (in dollars per share) |  |  |  |  |  |  |  |  | $ 55.01 |  |  |  |  |
Stock repurchase program remaining amount |  |  |  |  |  |  |  |  | $ 198,000,000 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
ASR April 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased and retired during period, shares | 546,993 |  |  |  |  |  |  |  |  |  |  |  |  |

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