Reward Rate Of Stock Appreciation Over Performance Period.

No definition available.

Name:	bco_RewardRateOfStockAppreciationOverPerformancePeriod
Namespace Prefix:	bco_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Dividend Rate

+ References

No definition available.

+ Details

Name:	bco_SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsDividendRate
Namespace Prefix:	bco_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Stock Price, Percent of Initial Price of Stock at Performance Period Start

+ References

No definition available.

+ Details

Name:	bco_StockPricePercentofInitialPriceofStockatPerformancePeriodStart
Namespace Prefix:	bco_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of common shares reserved for future issuance related to deferred compensation arrangements with individuals.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of share instruments newly issued under a share-based compensation plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average grant-date fair value of non-vested options outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The average discount rate applied to insurance contracts to determine future policy benefits to be paid to or on behalf of policyholders.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=99384497&loc=d3e14881-158438

+ Details

Name:	us-gaap_WeightedAverageDiscountRatePercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_TitleOfIndividualAxis=bco_EmployeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=us-gaap_DirectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=bco_DeferredStockUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=bco_TSRPSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=bco_MarketShareUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=bco_InternalMetricPerformanceShareUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=bco_SharebasedCompensationAwardAdditionalTwoyearVestingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=bco_SharebasedCompensationAwardCurrentyearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=bco_SharebasedCompensationAwardPrioryearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Share-Based Compensation Plans - Narrative (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized, not yet granted (in shares)	5,800,000.0
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation plan, stock units held (shares)	170,672	145,720
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation plan, stock units held (shares)	18,159	15,895
Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
The weighted-average fair value per share at grant date	$ 74.43
The weighted-average grant-date fair value (in dollars per share)	$ 74.43	$ 60.80	$ 29.41
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
The weighted-average fair value per share at grant date	$ 72.31	$ 55.85	$ 29.06
Weighted-average discount percent	2.00%	2.00%	3.00%
Performance Shares Units PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
The weighted-average fair value per share at grant date	$ 73.49
Actual shares earned and distributed (shares)		344,300
TSR PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Performance period	3 years
Dividend yield	0.00%
Market Share Units MSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years
Actual shares earned and distributed (shares)		111,300
Less than percent of initial price	50.00%
Market Share Units MSU \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of an employees award	0.00%
Market Share Units MSU \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of an employees award	150.00%
Stock Options \| Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	6 years
Share-based Compensation Award, Three-year Vesting \| Internal Metric Performance Share Units (IM PSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years
Share-based Compensation Award, Two-year Vesting \| Internal Metric Performance Share Units (IM PSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	2 years
Share-based Compensation Award, One-year Vesting \| Internal Metric Performance Share Units (IM PSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	1 year
Share-based Compensation Award, One-year Vesting \| Internal Metric Performance Share Units (IM PSU) \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of an employees award	0.00%
Share-based Compensation Award, One-year Vesting \| Internal Metric Performance Share Units (IM PSU) \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of an employees award	100.00%
Share-based Compensation Award, Additional Two-year Vesting \| Internal Metric Performance Share Units (IM PSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	2 years
Share-based Compensation Award, Additional Two-year Vesting \| Internal Metric Performance Share Units (IM PSU) \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of an employees award	0.00%
Share-based Compensation Award, Additional Two-year Vesting \| Internal Metric Performance Share Units (IM PSU) \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of an employees award	200.00%
Share-based Compensation Award, Current-year \| TSR PSU \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of an employees award	0.00%
Share-based Compensation Award, Current-year \| TSR PSU \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of an employees award	200.00%
Share-based Compensation Award, Prior-year \| TSR PSU \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of an employees award	0.00%
Share-based Compensation Award, Prior-year \| TSR PSU \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of an employees award	150.00%