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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Capital Stock (Details) - USD ($)	3 Months Ended		12 Months Ended
Capital Stock (Details) - USD ($)	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Dec. 10, 2025	Nov. 02, 2023
Share Repurchase Program [Line Items]
Shares of common stock authorized (in shares)	100,000,000.0		100,000,000.0
Shares issued and outstanding (in shares)	41,200,000		41,100,000
Dividends (dollars per share)	$ 0.2550	$ 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	$ 30,200,000	$ 44,800,000
750 Million Share Repurchase Program
Share Repurchase Program [Line Items]
Stock repurchase program amount				$ 750,000,000
Stock repurchased and retired during period (in shares)	241,321
Repurchase shares of Brink's common stock	$ 30,200,000
Average price per share (in dollars per share)	$ 125.12
Stock repurchase program remaining amount	$ 720,000,000
500 Million Share Repurchase Program
Share Repurchase Program [Line Items]
Stock repurchase program amount					$ 500,000,000
Stock repurchased and retired during period (in shares)			2,210,616
Repurchase shares of Brink's common stock			$ 209,400,000
Average price per share (in dollars per share)			$ 94.74
Stock repurchase program remaining amount			$ 87,000,000