Borrowings - Schedule of Outstanding Borrowings (Details) - USD ($) $ in Millions	Dec. 31, 2024	Jun. 30, 2024	Aug. 17, 2023	May 31, 2021	Dec. 31, 2019	Jun. 30, 2016
Debt Instrument [Line Items]
Principal amount	$ 3,668.8
Long-term debt	3,655.6	$ 3,355.1
Unused Available Capacity	1,201.2
Fair value	3,443.4
Total debt	3,655.6	3,355.1
Revolving Credit Facility
Debt Instrument [Line Items]
Principal amount	298.8
Long-term debt	298.8	0.0
Unused Available Capacity	1,201.2
Fair value	298.8
Senior Notes
Debt Instrument [Line Items]
Principal amount	2,250.0
Long-term debt	2,238.4	2,237.2
Fair value	2,024.6
Fiscal 2025 Revolving Credit Facility U.S. Dollar Tranche | Revolving Credit Facility
Debt Instrument [Line Items]
Principal amount	170.0
Long-term debt	170.0	0.0
Unused Available Capacity	830.0
Fair value	170.0
Fiscal 2025 Revolving Credit Facility Multicurrency Tranche | Revolving Credit Facility
Debt Instrument [Line Items]
Principal amount	128.8
Long-term debt	128.8	0.0
Unused Available Capacity	371.2
Fair value	128.8
Fiscal 2024 Amended Term Loan | Term Loans
Debt Instrument [Line Items]
Principal amount	1,120.0		$ 1,300.0
Long-term debt	1,118.4	1,117.9
Fair value	1,120.0
Fiscal 2016 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Principal amount	500.0					$ 500.0
Long-term debt	499.0	498.7
Fair value	490.6
Fiscal 2020 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Principal amount	750.0				$ 750.0
Long-term debt	745.6	745.1
Fair value	678.1	667.7
Fiscal 2021 Senior Notes | Senior Notes
Debt Instrument [Line Items]
Principal amount	1,000.0			$ 1,000.0
Long-term debt	993.9	$ 993.4
Fair value	$ 855.9