BORROWINGS - Additional Information (Details) - USD ($)			1 Months Ended						3 Months Ended		6 Months Ended
BORROWINGS - Additional Information (Details) - USD ($)	Aug. 21, 2025	Aug. 17, 2023	Dec. 31, 2024	May 31, 2021	Apr. 30, 2021	Mar. 31, 2021	Dec. 31, 2019	Jun. 30, 2016	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Jun. 30, 2025
Debt Instrument [Line Items]
Principal amount									$ 3,185,100,000		$ 3,185,100,000
Fair value of fixed-rate notes									3,055,300,000		3,055,300,000
Outstanding amount of line of credit									0		0		$ 0
Revolving Credit Facility
Debt Instrument [Line Items]
Principal amount									185,100,000		185,100,000
Fair value of fixed-rate notes									185,100,000		185,100,000
Senior Notes, Excluding Current Maturities
Debt Instrument [Line Items]
Principal amount									1,750,000,000		1,750,000,000
Fair value of fixed-rate notes									1,621,900,000		$ 1,621,900,000
Fiscal 2025 Revolving Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 1,500,000,000							$ 1,500,000,000		$ 1,500,000,000
Debt instrument, term			5 years
Annual facility fee (as basis points)											0.125%
Annual facility fee, step up (as basis points)											0.25%
Fiscal 2025 Revolving Credit Facility \| Revolving Credit Facility \| SOFR
Debt Instrument [Line Items]
Basis spread on variable rate											1.00%
Fiscal 2025 Revolving Credit Facility \| Revolving Credit Facility \| SOFR, Step Up
Debt Instrument [Line Items]
Basis spread on variable rate											1.25%
Fiscal 2025 Revolving Credit Facility \| Revolving Credit Facility \| SOFR, Step Down
Debt Instrument [Line Items]
Basis spread on variable rate											0.785%
Fiscal 2025 Revolving Credit Facility \| Senior Notes
Debt Instrument [Line Items]
Annual facility fee, step down (as basis points)											0.09%
Fiscal 2021 Revolving Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 1,500,000,000
Debt instrument, term					5 years
Fiscal 2025 Revolving Credit Facility U.S. Dollar Tranche \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity									1,000,000,000.0		$ 1,000,000,000.0
Principal amount									50,000,000.0		50,000,000.0
Fair value of fixed-rate notes									50,000,000.0		50,000,000.0
Fiscal 2025 Revolving Credit Facility Multicurrency Tranche \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity									500,000,000.0		500,000,000.0
Principal amount									135,100,000		135,100,000
Fair value of fixed-rate notes									$ 135,100,000		$ 135,100,000
Revolving Credit Facilities \| Revolving Credit Facility
Debt Instrument [Line Items]
Weighted-average interest rate									4.52%	5.75%	4.55%	6.04%
Fiscal 2021 Term Loans \| Term Loans
Debt Instrument [Line Items]
Debt instrument, term						18 months
Principal amount						$ 2,550,000,000
Fiscal 2021 Term Loans, Tranche 1 \| Term Loans
Debt Instrument [Line Items]
Principal amount						1,000,000,000
Fiscal 2021 Term Loans, Tranche 2 \| Term Loans
Debt Instrument [Line Items]
Principal amount						$ 1,550,000,000
Fiscal 2021 Term Loans, Tranche 2 \| Term Loans \| SOFR
Debt Instrument [Line Items]
Basis spread on variable rate						1.00%
Fiscal 2021 Term Loans, Tranche 2 \| Term Loans \| SOFR, Step Up
Debt Instrument [Line Items]
Basis spread on variable rate						1.25%
Fiscal 2021 Term Loans, Tranche 2 \| Term Loans \| SOFR, Step Down
Debt Instrument [Line Items]
Basis spread on variable rate						0.75%
Fiscal 2024 Amended Term Loans \| Term Loans
Debt Instrument [Line Items]
Principal amount		$ 1,300,000,000
Fiscal 2024 Amended Term Loans \| Term Loans \| SOFR
Debt Instrument [Line Items]
Basis spread on variable rate		1.25%
Fiscal 2024 Amended Term Loans \| Term Loans \| SOFR, Step Up
Debt Instrument [Line Items]
Basis spread on variable rate		1.375%
Fiscal 2024 Amended Term Loans \| Term Loans \| SOFR, Step Down \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		1.125%
Fiscal 2024 Amended Term Loans \| Term Loans \| SOFR, Step Down \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Fiscal 2026 Term Loan \| Term Loans
Debt Instrument [Line Items]
Principal amount	$ 750,000,000								$ 750,000,000.0		$ 750,000,000.0
Fair value of fixed-rate notes									750,000,000.0		750,000,000.0
Fiscal 2026 Term Loan \| Term Loans \| SOFR
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%
Fiscal 2026 Term Loan \| Term Loans \| SOFR, Step Up \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	1.625%
Fiscal 2026 Term Loan \| Term Loans \| SOFR, Step Up \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.375%
Fiscal 2026 Term Loan \| Term Loans \| SOFR, Step Down \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	1.125%
Fiscal 2026 Term Loan \| Term Loans \| SOFR, Step Down \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Fiscal 2016 Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Principal amount								$ 500,000,000.0
Interest rate, senior notes								3.40%
Percentage of principal amount at issuance								99.589%
Effective interest rate								3.449%
Fiscal 2016 Senior Notes \| Senior Notes \| Long-term debt, excluding current portion
Debt Instrument [Line Items]
Fair value of fixed-rate notes													494,100,000
Fiscal 2016 Senior Notes \| Senior Notes, Excluding Current Maturities \| Long-term debt, excluding current portion
Debt Instrument [Line Items]
Fair value of fixed-rate notes									498,300,000		498,300,000
Fiscal 2020 Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Principal amount							$ 750,000,000
Interest rate, senior notes							2.90%
Percentage of principal amount at issuance							99.717%
Effective interest rate							2.933%
Fair value of fixed-rate notes													702,800,000
Fiscal 2020 Senior Notes \| Senior Notes, Excluding Current Maturities
Debt Instrument [Line Items]
Principal amount									750,000,000.0		750,000,000.0
Fair value of fixed-rate notes									712,100,000		712,100,000
Fiscal 2021 Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Principal amount				$ 1,000,000,000
Interest rate, senior notes				2.60%
Percentage of principal amount at issuance				99.957%
Effective interest rate				2.605%
Fiscal 2021 Senior Notes \| Senior Notes \| Long-term debt, excluding current portion
Debt Instrument [Line Items]
Fair value of fixed-rate notes													$ 891,400,000
Fiscal 2021 Senior Notes \| Senior Notes, Excluding Current Maturities
Debt Instrument [Line Items]
Principal amount									1,000,000,000		1,000,000,000
Fair value of fixed-rate notes									909,800,000		909,800,000
Fiscal 2021 Senior Notes \| Senior Notes, Excluding Current Maturities \| Long-term debt, excluding current portion
Debt Instrument [Line Items]
Fair value of fixed-rate notes									$ 909,800,000		$ 909,800,000

BROADRIDGE FINANCIAL SOLUTIONS, INC. 10-Q