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Debt and Lines of Credit - Debt (Details) - USD ($) $ in Millions	Aug. 31, 2023	Aug. 31, 2022	Nov. 10, 2020
Debt Instrument [Line Items]
Short-term borrowings under credit facility	$ 0.0	$ 18.0
Total debt	495.6	513.0
Credit Facility | Revolving credit facility borrowings
Debt Instrument [Line Items]
Short-term borrowings under credit facility	0.0	18.0
Senior Unsecured Notes | Unsecured public notes due December 2030
Debt Instrument [Line Items]
Senior unsecured public notes due December 2030, principal	500.0	500.0
Senior unsecured public notes due December 2030, unamortized discount and deferred costs	$ (4.4)	$ (5.0)
Unsecured Term Loan | 2.150% Senior Unsecured Notes Due December 2030 | Acuity Brands Lighting, Inc.
Debt Instrument [Line Items]
Debt instrument, face amount			$ 500.0

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