Interim Financial Data by Segment - Schedule of Depreciation and Amortization Included in Earnings Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Total depreciation and amortization	$ 146.4	$ 147.1	$ 438.7	$ 436.7
Other
Segment Reporting Information [Line Items]
Total depreciation and amortization	14.3	15.6	43.8	48.0
Employer Services \| Operating Segments
Segment Reporting Information [Line Items]
Total depreciation and amortization	131.6	129.8	393.2	383.7
PEO \| Operating Segments
Segment Reporting Information [Line Items]
Total depreciation and amortization	$ 0.5	$ 1.7	$ 1.7	$ 5.0

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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