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Acquisitions - Pro Forma (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Business Acquisition [Line Items]    
Actual revenue results included in consolidation $ 54.1 $ 0.6
Actual net income results included in consolidation 3.5 0.1
Revenues 879.1 788.4
Reported net income attributable to Brink's 22.3 34.7
Pro forma revenue results 879.1 841.3
Pro forma net income results 22.3 37.8
Transaction costs 0.5 0.2
Maco    
Business Acquisition [Line Items]    
Actual revenue results included in consolidation 24.3 0.0
Actual net income results included in consolidation 3.4 0.0
Pro forma revenue results 0.0 24.9
Pro forma net income results 0.0 2.6
Other Acquisitions    
Business Acquisition [Line Items]    
Actual revenue results included in consolidation 29.8 0.6
Actual net income results included in consolidation 0.1 0.1
Pro forma revenue results 0.0 28.0
Pro forma net income results $ 0.0 $ 0.5