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Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2014
Dec. 31, 2011
Feb. 28, 2013
Feb. 28, 2015
Venezuela Foreign Currency Transaction [Abstract]              
Revenues $ 3,562.3us-gaap_Revenues $ 3,778.6us-gaap_Revenues $ 3,577.6us-gaap_Revenues        
Net monetary assets 746.9us-gaap_AssetsNet 912.8us-gaap_AssetsNet 842.6us-gaap_AssetsNet        
Cash and cash equivalents 176.2us-gaap_CashAndCashEquivalentsAtCarryingValue 255.5us-gaap_CashAndCashEquivalentsAtCarryingValue 201.7us-gaap_CashAndCashEquivalentsAtCarryingValue   182.9us-gaap_CashAndCashEquivalentsAtCarryingValue    
Foreign currency translation losses total (87.0)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax (32.8)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax 3.4us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax        
Brinks investments in Venzuelan Operations on an equity-method basis 2.7us-gaap_EquityMethodInvestments 15.8us-gaap_EquityMethodInvestments          
Venezuela [Member]              
Venezuela Foreign Currency Transaction [Abstract]              
Revenues 212.0us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
           
Venezuelan revenues as a percentage of total revenues 6.00%bco_SegmentRevenuePercentageOfConsolidatedRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
           
Net monetary assets 23.5us-gaap_AssetsNet
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
120.4us-gaap_AssetsNet
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
         
Cash and cash equivalents 12.6us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
93.8us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
         
Nonmonetary assets 55.0us-gaap_AssetsNoncurrent
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
59.9us-gaap_AssetsNoncurrent
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
         
Foreign Currency Amount 1.2invest_InvestmentForeignCurrencyContractForeignCurrencyAmount
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
           
Foreign currency translation losses attributable to noncontrolling interests 39.7us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
4.7us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
         
Net remeasurement loss   13.4us-gaap_AmountRecognizedInIncomeDueToInflationaryAccounting
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
  121.6us-gaap_AmountRecognizedInIncomeDueToInflationaryAccounting
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
     
Brinks investments in Venzuelan Operations on an equity-method basis 59.6us-gaap_EquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
125.3us-gaap_EquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
         
Venezuelan Bolivar Fuerte [Member]              
Venezuela Foreign Currency Transaction [Abstract]              
Net remeasurement loss 121.6us-gaap_AmountRecognizedInIncomeDueToInflationaryAccounting
/ us-gaap_CurrencyAxis
= currency_VEF
13.4us-gaap_AmountRecognizedInIncomeDueToInflationaryAccounting
/ us-gaap_CurrencyAxis
= currency_VEF
         
Venezuelan Bolivar Fuerte [Member] | Venezuela [Member]              
Venezuela Foreign Currency Transaction [Abstract]              
Foreign Currency Exchange Rate Translation 50us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_CurrencyAxis
= currency_VEF
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
           
SICAD II [Member]              
Venezuela Foreign Currency Transaction [Abstract]              
Net remeasurement loss       $ 121.9us-gaap_AmountRecognizedInIncomeDueToInflationaryAccounting
/ us-gaap_CurrencyAxis
= bco_SicadIiMember
     
SICAD II [Member] | Venezuela [Member]              
Venezuela Foreign Currency Transaction [Abstract]              
Foreign Currency Exchange Rate Translation 51us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_CurrencyAxis
= bco_SicadIiMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
           
Maximum [Member] | Venezuelan Bolivar Fuerte [Member]              
Venezuela Foreign Currency Transaction [Abstract]              
Foreign Currency Exchange Rate to the US dollar, Remeasurement       50us-gaap_ForeignCurrencyExchangeRateRemeasurement1
/ us-gaap_CurrencyAxis
= currency_VEF
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
  6.3us-gaap_ForeignCurrencyExchangeRateRemeasurement1
/ us-gaap_CurrencyAxis
= currency_VEF
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Maximum [Member] | SICAD [Member] | Venezuela [Member]              
Venezuela Foreign Currency Transaction [Abstract]              
Foreign Currency Exchange Rate Translation 12us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_CurrencyAxis
= bco_SicadIMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
        6.3us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_CurrencyAxis
= bco_SicadIMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
 
Maximum [Member] | SICAD II [Member] | Venezuela [Member]              
Venezuela Foreign Currency Transaction [Abstract]              
Foreign Currency Exchange Rate Translation       52us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_CurrencyAxis
= bco_SicadIiMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
     
Maximum [Member] | SIMADI [Member] | Venezuela [Member]              
Venezuela Foreign Currency Transaction [Abstract]              
Foreign Currency Exchange Rate Translation             174.0us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_CurrencyAxis
= bco_SimadiMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
Minimum [Member] | Venezuelan Bolivar Fuerte [Member]              
Venezuela Foreign Currency Transaction [Abstract]              
Foreign Currency Exchange Rate to the US dollar, Remeasurement       6.3us-gaap_ForeignCurrencyExchangeRateRemeasurement1
/ us-gaap_CurrencyAxis
= currency_VEF
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
  5.3us-gaap_ForeignCurrencyExchangeRateRemeasurement1
/ us-gaap_CurrencyAxis
= currency_VEF
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Minimum [Member] | Venezuelan Bolivar Fuerte [Member] | Venezuela [Member]              
Venezuela Foreign Currency Transaction [Abstract]              
Foreign Currency Exchange Rate to the US dollar, Remeasurement     5.3us-gaap_ForeignCurrencyExchangeRateRemeasurement1
/ us-gaap_CurrencyAxis
= currency_VEF
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
       
Minimum [Member] | SICAD [Member] | Venezuela [Member]              
Venezuela Foreign Currency Transaction [Abstract]              
Foreign Currency Exchange Rate Translation 10us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_CurrencyAxis
= bco_SicadIMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
        5.3us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_CurrencyAxis
= bco_SicadIMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
 
Minimum [Member] | SICAD II [Member] | Venezuela [Member]              
Venezuela Foreign Currency Transaction [Abstract]              
Foreign Currency Exchange Rate Translation       49us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_CurrencyAxis
= bco_SicadIiMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE
     
Minimum [Member] | SIMADI [Member] | Venezuela [Member]              
Venezuela Foreign Currency Transaction [Abstract]              
Foreign Currency Exchange Rate Translation             170.0us-gaap_ForeignCurrencyExchangeRateTranslation1
/ us-gaap_CurrencyAxis
= bco_SimadiMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_VE