Debt Instrument, Annual Amortization Percent

No definition available.

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

- Definition

Line of Credit, Number of Credit Facilities

+ References

No definition available.

+ Details

Name:	bco_LineofCreditNumberofCreditFacilities
Namespace Prefix:	bco_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_DebtInstrumentAxis=bco_SeniorSecuredCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bco_TwoUnsecuredLetterOfCreditFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bco_FortyMillionUnsecuredLetterOfCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bco_FiftyFourMillionUnsecuredLetterOfCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=bco_SixhundredmillionseniorunsecurednotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ForeignLineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Data Type:	na
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Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=bco_SeniorSecuredCreditFacilityMember
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
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Period Type:

Debt - Narrative (Details)	1 Months Ended	3 Months Ended
Debt - Narrative (Details)	Oct. 31, 2017 USD ($)	Mar. 31, 2018 USD ($) facility
Senior Secured Credit Facility
Debt Instrument [Line Items]
Commitment Fee		0.25%
Letter of Credit
Debt Instrument [Line Items]
Maximum Borrowing Capacity		$ 40,000,000
Undrawn letters of credit		$ 11,000,000
Number of term loan facilities \| facility		2
Letter of Credit \| Two Unsecured Letter Of Credit Facilities
Debt Instrument [Line Items]
Available capacity amount		$ 40,000,000
Undrawn letters of credit		54,000,000
Amount available		94,000,000
Letter of Credit \| Forty Million Unsecured Letter Of Credit Facility
Debt Instrument [Line Items]
Available capacity amount		40,000,000
Letter of Credit \| Fifty Four Million Unsecured Letter Of Credit Facility
Debt Instrument [Line Items]
Available capacity amount		$ 54,000,000
Minimum \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Commitment Fee		0.15%
Maximum \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Commitment Fee		0.40%
Revolving Credit Facility \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Maximum Borrowing Capacity	$ 1,000,000,000
Line of credit maturity period	5 years
Available capacity amount		$ 1,000,000,000
Term loan A \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 500,000,000
Annual amortization percent	5.00%
Debt maturity period	5 years
Senior unsecured notes \| Six hundred million senior unsecured notes
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 600,000,000
Debt maturity period	10 years
Interest Rate Percentage	4.625%
Multi-currency revolving facility
Debt Instrument [Line Items]
Maximum Borrowing Capacity		10,000,000
Available capacity amount		5,000,000
Multi-currency revolving facility \| Letter of Credit
Debt Instrument [Line Items]
Undrawn letters of credit		$ 5,000,000
LIBOR \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Interest rate margin		1.75%
LIBOR \| Senior Secured Credit Facility \| Minimum
Debt Instrument [Line Items]
Interest rate margin		1.25%
LIBOR \| Senior Secured Credit Facility \| Maximum
Debt Instrument [Line Items]
Interest rate margin		2.50%
Base Rate \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Interest rate margin		0.75%
Base Rate \| Senior Secured Credit Facility \| Minimum
Debt Instrument [Line Items]
Interest rate margin		0.25%
Base Rate \| Senior Secured Credit Facility \| Maximum
Debt Instrument [Line Items]
Interest rate margin		1.50%