v3.26.1
Capital Stock (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 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   100,000,000.0    
Shares issued and outstanding (in shares) 41,200,000       41,200,000   41,100,000    
Dividends (dollars per share) $ 0.2550 $ 0.2550 $ 0.2550 $ 0.2425          
Maximum shares allowed for issuance (in shares) 2,000,000.0       2,000,000.0        
Par value (in dollars per share) $ 10       $ 10        
Repurchase shares of Brink's common stock         $ 30,200,000 $ 130,000,000.0      
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       $ 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