Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Income Tax Examination [Line Items]
Effective tax rate	23.00%	23.20%	23.00%
Long-term deferred tax assets	$ 616.6	$ 731.6
Undistributed earnings of foreign subsidiaries	55.5
Deferred tax assets, operating loss carryforwards	57.4	59.3
Valuation allowance	24.1	23.8
Income taxes paid		1,198.0	$ 1,185.2
Unrecognized tax benefits	152.5	163.0	126.9	$ 116.9
Unrecognized tax benefits that would impact effective tax rate	110.2	119.0	91.8
Unrecognized tax benefits, interest benefit on income taxes expense	0.8
Unrecognized tax benefits, interest on income taxes expense		4.3	$ 5.7
Unrecognized tax benefits, interest on income taxes accrued	27.6	36.9
Unrecognized tax benefits, income tax penalties accrued	0.2	0.3
Foreign Tax Authority
Income Tax Examination [Line Items]
Deferred tax assets, operating loss carryforwards	173.5
Deferred tax assets, operating loss carryforwards, subject to expiration	18.8
Operating loss carry forwards not subject to expiration	154.7
Domestic Tax Authority
Income Tax Examination [Line Items]
Deferred tax assets, operating loss carryforwards, subject to expiration	8.7
Operating loss carry forwards not subject to expiration	15.3
Operating loss carryforwards	24.0
Income Tax Jurisdiction, Domestic State and Local
Income Tax Examination [Line Items]
Operating loss carryforwards	140.0
Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent
Income Tax Examination [Line Items]
Long-term deferred tax assets	$ 64.2	$ 56.1