v3.19.2

Contractual Commitments, Contingencies, and Off-Balance Sheet Arrangements - Schedule of Minimum Commitments Related to Technology Service Agreement (Details) $ in Millions | Jun. 30, 2019 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
2020 | $ 117.6
2021 | 111.1
2023 | 102.5
2023 | 96.4
2024 | 91.4
Thereafter | 204.4
Total | $ 723.5

X
- Definition Minimum Commitment After Fifth Year + References No definition available. + Details
Name: | br_MinimumCommitmentAfterFifthYear
Namespace Prefix: | br_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Minimum Commitment Total + References No definition available. + Details
Name: | br_MinimumCommitmentTotal
Namespace Prefix: | br_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Minimum Commitment Year Five + References No definition available. + Details
Name: | br_MinimumCommitmentYearFive
Namespace Prefix: | br_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Minimum Commitment Year Four + References No definition available. + Details
Name: | br_MinimumCommitmentYearFour
Namespace Prefix: | br_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Minimum Commitment Year One + References No definition available. + Details
Name: | br_MinimumCommitmentYearOne
Namespace Prefix: | br_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Minimum Commitment Year Three + References No definition available. + Details
Name: | br_MinimumCommitmentYearThree
Namespace Prefix: | br_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Minimum Commitment Year Two + References No definition available. + Details
Name: | br_MinimumCommitmentYearTwo
Namespace Prefix: | br_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration