Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Feb. 28, 2015
Venezuela Foreign Currency Transaction [Abstract]          
Cash and cash equivalents $ 168.8 $ 201.5 $ 176.2 $ 255.5  
Foreign currency translation losses total (50.4) (4.2)      
Accumulated other comprehensive losses attributable to Brinks shareholders (833.8)   (792.0)    
Venezuela [Member]          
Venezuela Foreign Currency Transaction [Abstract]          
Revenues 20.5 131.3      
Venezuelan revenues as a percentage of total revenues 3.00% 14.00%      
Foreign currency translation losses attributable to noncontrolling interests 5.6 39.7      
Net remeasurement loss (18.0) (121.9)      
Accumulated other comprehensive losses attributable to Brinks shareholders 112.8 113.0      
Venezuelan Bolivar Fuerte [Member] | Venezuela [Member]          
Venezuela Foreign Currency Transaction [Abstract]          
Net monetary assets 5.1   23.5    
Cash and cash equivalents 3.7   12.6    
Nonmonetary assets 51.5   55.0    
Foreign Currency Exchange Rate to the US dollar, Remeasurement   6.3      
Brinks investments in Venzuelan Operations on an equity-method basis 47.3   59.6    
SICAD II [Member] | Venezuela [Member]          
Venezuela Foreign Currency Transaction [Abstract]          
Foreign Currency Exchange Rate Translation     51    
Foreign Currency Amount     $ 1.2    
Maximum [Member] | Venezuelan Bolivar Fuerte [Member]          
Venezuela Foreign Currency Transaction [Abstract]          
Foreign Currency Exchange Rate to the US dollar, Remeasurement   50     170.0
Maximum [Member] | SICAD [Member] | Venezuela [Member]          
Venezuela Foreign Currency Transaction [Abstract]          
Foreign Currency Exchange Rate Translation     12    
Maximum [Member] | SICAD II [Member] | Venezuela [Member]          
Venezuela Foreign Currency Transaction [Abstract]          
Foreign Currency Exchange Rate Translation   52      
Maximum [Member] | SIMADI [Member] | Venezuela [Member]          
Venezuela Foreign Currency Transaction [Abstract]          
Foreign Currency Exchange Rate Translation 198        
Minimum [Member] | Venezuelan Bolivar Fuerte [Member]          
Venezuela Foreign Currency Transaction [Abstract]          
Foreign Currency Exchange Rate to the US dollar, Remeasurement   6.3     52
Minimum [Member] | SICAD [Member] | Venezuela [Member]          
Venezuela Foreign Currency Transaction [Abstract]          
Foreign Currency Exchange Rate Translation     10    
Minimum [Member] | SICAD II [Member] | Venezuela [Member]          
Venezuela Foreign Currency Transaction [Abstract]          
Foreign Currency Exchange Rate Translation   49      
Minimum [Member] | SIMADI [Member] | Venezuela [Member]          
Venezuela Foreign Currency Transaction [Abstract]          
Foreign Currency Exchange Rate Translation 170