v3.19.2

Financial Data by Segment - Schedule of Financial Data Segment Reporting Information (Details) $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2019 USD ($) Segment	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments									2	2
Revenues	$ 1,211.2	$ 1,224.8	$ 953.4	$ 972.8	$ 1,320.4	$ 1,071.9	$ 1,012.8	$ 924.8			$ 4,362.2	$ 4,329.9	$ 4,142.6
Earnings (loss) before income taxes	230.0	$ 223.6	$ 64.3	$ 89.3	258.0	$ 125.2	$ 103.5	$ 74.3			607.3	561.0	488.1
Assets	3,880.7				3,304.7				$ 3,880.7	$ 3,880.7	3,880.7	3,304.7	3,149.8
Payments to Acquire Property, Plant, and Equipment											50.6	76.7	85.4
Depreciation and amortization											85.2	82.1	68.6
Amortization of acquired intangibles and purchased intellectual property											87.4	81.4	72.6
Amortization of other assets											87.4	48.5	41.0
Investor Communication Solutions
Segment Reporting Information [Line Items]
Revenues											3,511.1
Operating Segments | Investor Communication Solutions
Segment Reporting Information [Line Items]
Revenues											3,511.1	3,495.6	3,398.6
Earnings (loss) before income taxes											508.4	494.6	428.2
Assets	2,169.5				2,089.0				2,169.5	2,169.5	2,169.5	2,089.0	1,931.2
Payments to Acquire Property, Plant, and Equipment											34.9	39.2	33.7
Depreciation and amortization											54.9	52.2	47.5
Amortization of acquired intangibles and purchased intellectual property											73.5	67.8	60.8
Amortization of other assets											37.1	12.6	12.4
Operating Segments | Global Technology and Operations
Segment Reporting Information [Line Items]
Revenues											953.5	911.6	825.5
Earnings (loss) before income taxes											210.3	199.3	162.5
Assets	1,409.6				908.3				1,409.6	1,409.6	1,409.6	908.3	886.2
Payments to Acquire Property, Plant, and Equipment											6.1	28.6	11.1
Depreciation and amortization											11.3	10.8	9.9
Amortization of acquired intangibles and purchased intellectual property											13.4	13.6	11.8
Amortization of other assets											45.0	30.6	23.9
Other
Segment Reporting Information [Line Items]
Revenues											0.0	0.0	0.0
Earnings (loss) before income taxes											(130.9)	(151.4)	(110.5)
Assets	301.6				307.4				301.6	301.6	301.6	307.4	332.4
Payments to Acquire Property, Plant, and Equipment											9.6	8.8	40.5
Depreciation and amortization											19.0	19.1	11.1
Amortization of acquired intangibles and purchased intellectual property											0.5	0.0	0.0
Amortization of other assets											5.3	5.3	4.6
Foreign Currency Exchange
Segment Reporting Information [Line Items]
Revenues											(102.4)	(77.3)	(81.5)
Earnings (loss) before income taxes											19.4	18.6	8.1
Assets	$ 0.0				$ 0.0				$ 0.0	$ 0.0	0.0	0.0	0.0
Payments to Acquire Property, Plant, and Equipment											0.0	0.0	0.0
Depreciation and amortization											0.0	0.0	0.0
Amortization of acquired intangibles and purchased intellectual property											0.0	0.0	0.0
Amortization of other assets											$ 0.0	$ 0.0	$ 0.0

X

- Definition

Business Combinations, Amortization Of Acquired Intangible Assets

+ References

No definition available.

+ Details

Name:	br_BusinessCombinationsAmortizationOfAcquiredIntangibleAssets
Namespace Prefix:	br_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amortization of other assets

+ References

No definition available.

+ Details

Name:	br_OtherAssetAmortization
Namespace Prefix:	br_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

+ Details

Name:	us-gaap_Assets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

+ Details

Name:	us-gaap_DepreciationAmortizationAndAccretionNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(10))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(8))
-URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(15))
-URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260

+ Details

Name:	us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=br_InvestorCommunicationSolutionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=br_GlobalTechnologyAndOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ConsolidationItemsAxis=us-gaap_CorporateNonSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ConsolidationItemsAxis=us-gaap_MaterialReconcilingItemsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: