Financial Data by Segment and Geographic Area - Revenues and Assets by Geographic Area (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting [Line Items]
Revenues	$ 21,947.4	$ 20,560.9	$ 19,202.6
Assets	63,193.3	53,369.3	54,362.7
United States
Segment Reporting [Line Items]
Revenues	19,279.8	18,179.2	16,934.2
Assets	54,851.4	46,763.0	47,989.9
EMEA
Segment Reporting [Line Items]
Revenues	1,733.3	1,533.5	1,451.4
Assets	3,544.3	3,025.5	2,800.8
Canada
Segment Reporting [Line Items]
Revenues	523.7	489.3	473.7
Assets	4,025.8	2,750.7	2,796.6
Other
Segment Reporting [Line Items]
Revenues	410.6	358.9	343.3
Assets	$ 771.8	$ 830.1	$ 775.4