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Share-based compensation plans - Terms and Assumptions (Details) - $ / shares
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Beginning average price of Brink’s common stock (dollars per share)   $ 29.79
Total Shareholder Return Performance Stock Unit    
Assumptions used to estimate fair value:    
Expected dividend yield 0.00%  
Expected stock price volatility 29.00%  
Risk-free interest rate 0.90%  
Contractual term in years 2 years 10 months 24 days  
Weighted-average fair value estimate per share (dollars per share) $ 33.58  
Performance Shares    
Assumptions used to estimate fair value:    
Weighted-average fair value estimate per share (dollars per share) $ 29.22