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Pension and Defined Contribution Plans - Reconciliation Fair Value Measurements (Details) $ in Millions	12 Months Ended
	Aug. 31, 2025 USD ($)
Defined Benefit Plan Disclosure [Roll Forward]
Fair Value Asset Recurring Basis Still Held Unrealized Gain (Loss) Statement of Income Extensible List Not Disclosed Flag	Unrealized loss
Level 3
Defined Benefit Plan Disclosure [Roll Forward]
Beginning balance	$ 0.0
Purchases	32.0
Unrealized loss	(3.2)
Ending balance	$ 28.8

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